taxonID	type	format	identifier	references	title	description	created	creator	contributor	publisher	audience	source	license	rightsHolder	datasetID
038E0354FFE2FFB27F00FACDFE7FF950.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557160/files/figure.png	http://doi.org/10.5281/zenodo.5557160	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFE2FFB27F00FACDFE7FF950.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557154/files/figure.png	http://doi.org/10.5281/zenodo.5557154	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFE2FFB27F00FACDFE7FF950.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557158/files/figure.png	http://doi.org/10.5281/zenodo.5557158	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFE3FFB17F48F8FBFD86F87B.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557160/files/figure.png	http://doi.org/10.5281/zenodo.5557160	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFE3FFB17F48F8FBFD86F87B.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557158/files/figure.png	http://doi.org/10.5281/zenodo.5557158	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFE3FFB17F48F8FBFD86F87B.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557156/files/figure.png	http://doi.org/10.5281/zenodo.5557156	Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.	Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFEFFAE7F74FEFEFAE7FCF2.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557160/files/figure.png	http://doi.org/10.5281/zenodo.5557160	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFEFFAE7F74FEFEFAE7FCF2.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557154/files/figure.png	http://doi.org/10.5281/zenodo.5557154	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFEFFAE7F74FEFEFAE7FCF2.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557158/files/figure.png	http://doi.org/10.5281/zenodo.5557158	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFEFFAE7F74FEFEFAE7FCF2.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557156/files/figure.png	http://doi.org/10.5281/zenodo.5557156	Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.	Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFFFFAD7F70FC9DFCB2F8A3.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557160/files/figure.png	http://doi.org/10.5281/zenodo.5557160	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFFFFAD7F70FC9DFCB2F8A3.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557154/files/figure.png	http://doi.org/10.5281/zenodo.5557154	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFFFFAD7F70FC9DFCB2F8A3.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557158/files/figure.png	http://doi.org/10.5281/zenodo.5557158	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFFFFAD7F70FC9DFCB2F8A3.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557156/files/figure.png	http://doi.org/10.5281/zenodo.5557156	Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.	Fig. 4. Principal Component Analysis (PCA) biplot based on the correlation coefficient showing the position of conodont specimens (abbreviated names, see Table 1) and morphological characters/variables. The latter is represented by blue vector lines (see Table 2), the direction and length of which mark the relative importance of the various characters/variables. Each coloured field marks the position of a selected species grouping. Whereas 18.4% of the total variance is visible along the PC 1 axis, 16.1% is seen along the PC 2 axis. See main text for further explanation on the analyses performed, and consult Table 1 for data on sample numbers.	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFCFFAB7CE8F89FFB0EFB7D.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557160/files/figure.png	http://doi.org/10.5281/zenodo.5557160	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFCFFAB7CE8F89FFB0EFB7D.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557158/files/figure.png	http://doi.org/10.5281/zenodo.5557158	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	Fig. 5. A. Results (probabilities) of the nonparametric PERMANOVA test performed on the first seven components of the PCA plot. Drepanoistodus basiovalis (Sergeeva, 1963) and the three new species, D. iommii sp. nov., D. svendi sp. nov. and D. viirae sp. nov. The three tested null hypotheses are that D. basiovalis is similar to each of the three new species, respectively. Because all the test results are below 0.05, the three null hypotheses are rejected, and there is no statistical evidence from the test that the groups (species) are similar. B. Univariate statistics with regard to the measured angle A and the calculated b/c ratio. Abbreviations: N = number of measured specimens; Min = lowest number; Max = highest number; Mean = average; Stand. dev. = standard deviation. All calculations were performed using the PAST software (Hammer et al. 2001).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFAFFAB7F35FB06FDC1F869.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557160/files/figure.png	http://doi.org/10.5281/zenodo.5557160	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFAFFAB7F35FB06FDC1F869.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557154/files/figure.png	http://doi.org/10.5281/zenodo.5557154	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFBFFAA7CDBFEFEFDE7F9AD.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557160/files/figure.png	http://doi.org/10.5281/zenodo.5557160	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	Fig. 6. Light microscopy photographs of selected geniculate elements of species of Drepanoistodus, as outlined herein, from the Lynna River section, Russia. A–D. Drepanoistodus basiovalis (Sergeeva, 1963). A. LO 12476t, inner view, sample LY12-16, L. variabilis Zone. B. Same specimen as A in outer view. C. LO 12477t, inner view, sample LY12-9,L. antivariabilis Zone.D. LO 12478t, inner view, sample LY12-21b, L. variabilis Zone. E–H. Drepanoistodus iommii sp. nov. E. LO 12479T, holotype, inner view, sample LY12-16, L. variabilis Zone. F. Same specimen as E in outer view. G. LO 12480t, inner view, sample LY12-21b, L. variabilis Zone. H. LO 12481t, inner view, sample LY12-3, L. antivariabilis Zone. I–L. Drepanoistodus svendi sp. nov. I. LO 12482t, inner view, sample LY12-13, L. variabilis Zone. J–K. LO 12483T, holotype, inner and outer view, respectively, sample LY12-14, L. variabilis	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
038E0354FFFBFFAA7CDBFEFEFDE7F9AD.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/5557154/files/figure.png	http://doi.org/10.5281/zenodo.5557154	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	Fig. 3. Geniculate Drepanoistodus basiovalis (Sergeeva, 1963) element demonstrating the essential morphological characteristics utilized in the present study. Two characters were measured quantitatively: Angle A between the median line (usually carina) of the cusp and the lower margin of the keel situated on the upper margin of the cusp (A); and the b/c ratio, which is the ratio between the length of the upper margin of the base (b) and the length of the free cusp (c).	2021-10-08	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders		Zenodo	biologists	Rasmussen, Jan Audun;Eriksson, Mats E.;Lindskog, Anders			
