taxonID	type	description	language	source
B90E856D443B56B48F5890009DA07C2C.taxon	description	Figs 6, 7, 8 New Japanese name: Iwata-chikayokoebi	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
B90E856D443B56B48F5890009DA07C2C.taxon	diagnosis	Diagnosis. Urosomite 3 without dorsal setae. Epimeral plates 2 - 3 each with ventral robust seta. Peduncular article 1 of antenna 1 with robust seta on posterodistal corner. Antenna 2 with peduncular article 2 gland cone not exceeding end of article 3. Mandible with 5 - dentate left incisor; left lacinia mobilis 4 - dentate, right one bifid with many teeth. Inner plate of maxilla 1 with eight plumose setae. Inner plate of maxilla 2 with seven facial seta in oblique row. Peduncle of pleopod 3 with seta. Uropod 1 with peduncle bearing basofacial robust setae. Uropod 3 with inner ramus 0.25 times as long as outer ramus; outer ramus 2 - ariticulate, with plumose setae on medial margin. Telson almost as long as width, cleft for 67 % of length.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
B90E856D443B56B48F5890009DA07C2C.taxon	etymology	Etymology. The specific epithet was derived from the names of Mr. Yasuyuki Iwata and Mr. Tomofumi Iwata, who collected the specimens of this new species.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
B90E856D443B56B48F5890009DA07C2C.taxon	description	Description. Female holotype, NSMT-Cr 30782. Head (Fig. 6 A) as long as pereonites 1 and 2 combined; eyes absent; inferior antennal sinus distinct with rounded angle. Dorsal margins of pleonites 1 - 3 (Fig. 6 B-D) each with four setae. Posterodistal corners of epimeral plates 1 - 3 (Fig. 6 E-G) weakly produced; ventral margin of epimeral plate 1 without setae, epimeral plates 2 and 3 each with ventral robust seta; posterior margins of epimeral plates 1 - 3 each with two setae. Dorsal margin of urosomite 1 (Fig. 6 H) with slender setae; urosomite 2 (Fig. 6 I) with dorsal robust setae; urosomite 3 (Fig. 6 J) without dorsal setae. Antenna 1 (Fig. 6 K) length 0.25 times as long as body; length ratio of peduncular articles 1 - 3 in 1.0: 0.8: 0.4; posterodistal corner of peduncular article 1 with robust seta; accessory flagellum 4 - articulate; primary flagellum 27 - articulate. Antenna 2 (Fig. 6 L) length 0.7 times as long as antenna 1; peduncular article 4 slightly shorter than article 5; flagellum 22 - articulate; calceoli absent. Upper lip (Fig. 6 M) with rounded apical margin bearing fine setae. Mandibles (Fig. 6 N-P) with left and right incisors comprising five and six teeth, respectively; left lacinia mobilis comprising four teeth, right lacinia mobilis bifid with many teeth; molar process triturative with plumose seta; length ratio of palp articles 1 - 3 in 1.0: 2.0: 1.5; palp article 1 without setae; palp article 2 with eight marginal setae; palp article 3 with pair of A-setae, several D-setae and E-setae, lateral face with fine setae. Lower lip (Fig. 6 Q) lacking inner lobes; outer lobes broad, shoulder rounded, with fine setae. Maxilla 1 (Fig. 6 R, S) with elliptical inner lobe, bearing eight plumose setae on medial margin; outer plate rectangular, with 11 serrate robust setae apically; palp 2 - articulate, article 1 without setae, article 2 with five robust setae and slender plumose seta apically. Maxilla 2 (Fig. 6 T) with inner plate bearing seven plumose setae in oblique row. Maxilliped (Fig. 7 A-C) with inner plate exceeding end of palp article 1, subquadrate, bearing three subapical robust setae and medial robust seta; outer plate ovate, reaching middle of palp article 2, with row of robust setae along apical to medial margins; palp 4 - articulate, article 2 longest with medial setae, nail of article 4 distinct. Gnathopod 1 (Fig. 7 D, E) with subquadrate coxa bearing setae along anterior to ventral margins; anterior and posterior margins of basis with long setae; carpus length 0.9 times as long as length of propodus and 1.4 times width of carpus; propodus length 1.7 times width, palmar margin weakly serrate, oblique, with three medial and one lateral robust setae; dactylus reaching posterodistal corner of propodus. Gnathopod 2 (Fig. 7 F, G) with coxa expanded proximally bearing setae along anterior to ventral margins; posterior margin of basis with long setae; carpus length 1.2 times as long as length of propodus and 2.8 times width of carpus; propodus length 2.2 times width, palmar margin weakly serrate, almost vertical, with two medial and two lateral robust setae; dactylus reaching posterodistal corner of propodus. Pereopod 3 (Fig. 7 H, I) with subquadrate coxa, proximally expanded, bearing setae along anterior to ventral margins; posterior margin of basis with long setae. Pereopod 4 (Fig. 7 J) with coxa bearing setae along anterior to ventral margins, posteroproximally concave; posterior margin of basis with long setae. Pereopod 5 (Fig. 7 K) with bilobed coxa bearing seta on posterior lobe; anterior margin of basis with robust setae, posterodistal corner weakly lobate. Pereopod 6 (Fig. 7 L) with bilobed coxa bearing seta on anterior and posterior lobes; basis with robust setae on anterior margin, posterodistal corner weakly lobate. Pereopod 7 (Fig. 8 A-C) with elliptical basis bearing robust setae on anterior margin, posterodistal corner weakly lobate. Coxal gills (Fig. 8 D, E) ovate with stalks on gnathopod 2 and pereopods 3 - 6. Pleopods 1 - 3 (Fig. 8 F-I) with peduncles longer than rami, bearing distal seta on pleopods 1 and 2 and proximal seta on pleopod 3; retinacula paired (Fig. 8 I); mediobasal margin of inner ramus with bifid plumose setae; rami well developed. Uropod 1 (Fig. 8 J) with peduncle bearing three basofacial robust setae and dorsal robust setae; inner ramus length 0.7 times as long as peduncle, with two medial and one lateral robust setae, and ventroproximal seta; outer ramus length 0.9 times as long as inner ramus, with two robust setae on medial margin. Uropod 2 (Fig. 8 K) with peduncle bearing dorsal robust setae; inner ramus as long as peduncle, bearing two medial robust setae and ventroproximal slender seta; outer ramus length 0.7 times as long as inner ramus, without marginal setae. Uropod 3 (Fig. 8 L) with peduncle length 0.3 times as long as outer ramus, bearing robust setae on distal edge; inner ramus length 0.2 times as long as outer ramus, with seta on medial margin; outer ramus 2 - articulate, proximal article with plumose setae on medial margin and robust setae on medial and lateral margins, terminal article length 0.2 times as long as proximal article with subapical setae. Telson (Fig. 8 M) length slightly shorter than wide, each lobe with two lateral and three apical robust setae and two dorsolateral penicillate setae, cleft for 67 %.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
B90E856D443B56B48F5890009DA07C2C.taxon	distribution	Distribution and environment. The species is known only from its type locality in the Sabi River, Tochigi Prefecture, Japan.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
9D1D2179706C5BC4BB2F8F49983498F4.taxon	description	Figs 9, 10, 11, 12 Japanese name: Kojima-chikayokoebi	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
9D1D2179706C5BC4BB2F8F49983498F4.taxon	materials_examined	Material examined. ♀ 6.3 mm (NSMT-Cr 30785, G 1905), ♂ 4.8 mm (NSMT-Cr 30786), Mamashita Spring (35.680066 ° N, 139.428283 ° E), Kunitachi, Tokyo, Japan, collected by K. Tomikawa on 25 June 2016. ♀ 5.0 mm (NSMT-Cr 30787, G 1930), ♀ 4.5 mm (NSMT-Cr 30788, G 1931), Hinochūōtoshokan Spring (35.655783 ° N, 139.382133 ° E), Hino, Tokyo, Japan, collected by K. Tomikawa on 25 June 2016.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
9D1D2179706C5BC4BB2F8F49983498F4.taxon	diagnosis	Diagnosis. Urosomite 3 with dorsal robust setae. Epimeral plates 2 - 3 each with ventral robust seta. Peduncular article 1 of antenna 1 with robust seta on posterodistal corner. Antenna 2 with peduncular article 2 gland cone not exceeding end of article 3; calceoli present in male. Mandible with 5 - or 6 - dentate left incisor; 4 - or 5 - dentate left lacinia mobilis, right one bifid with many teeth. Inner plate of maxilla 1 with eight plumose setae. Inner plate of maxilla 2 with nine facial seta in oblique row. Peduncle of pleopod 3 without seta. Uropod 1 with peduncle bearing basofacial robust setae. Uropod 3 with inner ramus 0.25 times as long as outer ramus in female and 0.27 times in male; outer ramus 2 - ariticulate, with plumose setae on medial margin. Telson length 0.9 times width, cleft for 69 % of length.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
9D1D2179706C5BC4BB2F8F49983498F4.taxon	description	Description. Female (NSMT-Cr 30785). Head (Fig. 9 A) as long as pereonites 1 and 2 combined; eyes absent; inferior antennal sinus distinct with rounded angle. Dorsal margins of pleonites 1 - 3 (Fig. 9 B-D) each with 4 setae. Posterodistal corners of epimeral plates 1 - 3 (Fig. 9 E-G) weakly produced; ventral margin of epimeral plate 1 without setae, epimeral plates 2 and 3 each with ventral robust seta; posterior margins of epimeral plates 1 - 3 each with two setae. Dorsal margin of urosomite 1 (Fig. 9 H) with slender setae and robust seta; urosomites 2 and 3 (Fig. 9 I, J) with pair of dorsal robust setae. Antenna 1 (Fig. 9 K) length 0.22 times as long as body; length ratio of peduncular articles 1 - 3 in 1.0: 0.8: 0.4; posterodistal corner of peduncular article 1 with robust seta; accessory flagellum 4 - articulate; primary flagellum 26 - articulate. Antenna 2 (Fig. 9 L) length 0.6 times as long as antenna 1; peduncular article 4 length 0.9 times as long as article 5; flagellum 13 - articulate; calceoli absent. Upper lip (Fig. 9 M) with rounded apical margin bearing fine setae. Mandibles (Fig. 9 N-P) with left and right incisors comprising five and six teeth, respectively; left lacinia mobilis comprising four teeth, right lacinia mobilis bifid with many teeth; molar process triturative with plumose seta; length ratio of palp articles 1 - 3 in 1.0: 2.3: 1.7; palp article 1 without setae; palp article 2 with nine marginal setae; palp article 3 with pair of A-setae, several D-setae and three E-setae, lateral face with fine setae. Lower lip (Fig. 9 Q) lacking inner lobes; outer lobes broad, shoulder rounded, with fine setae. Maxilla 1 (Fig. 9 R, S) with subtriangular inner lobe, bearing eight plumose setae on medial margin; outer plate rectangular, with 11 serrate robust setae apically; palp 2 - articulate, article 1 without setae, article 2 with three robust setae and slender plumose seta along apically to medial margins. Maxilla 2 (Fig. 9 T) with inner plate bearing nine plumose setae in oblique row. Maxilliped (Fig. 10 A-C) with inner plate exceeding end of palp article 1, subquadrate, bearing three subapical robust setae and medial robust seta; outer plate ovate, reaching middle of palp article 2, with row of robust setae along apical to medial margins; palp 4 - articulate, article 2 longest with medial setae, nail of article 4 distinct. Gnathopod 1 (Fig. 10 D, E) with subquadrate coxa bearing setae along anterior to ventral margins; anterior and posterior margins of basis with long setae; carpus length 1.1 times as long as length of propodus and 1.7 times width of carpus; propodus length 1.9 times width, palmar margin weakly serrate, oblique, with three medial and two lateral robust setae; dactylus almost reaching posterodistal corner of propodus. Gnathopod 2 (Fig. 10 F, G) with coxa expanded proximally bearing setae along anterior to ventral margins; posterior margin of basis with long setae; carpus length 1.2 times as long as length of propodus and 3.3 times width of carpus; propodus length 2.8 times width, palmar margin weakly serrate, almost vertical, with two medial and one lateral robust setae; dactylus reaching posterodistal corner of propodus. Pereopod 3 (Fig. 10 H, I) with subquadrate coxa, proximally expanded, bearing setae along anterior to ventral margins; anteroproximal and posterior margins of basis with long setae. Pereopod 4 (Fig. 10 J) with coxa bearing setae along anterior to ventral margins, posteroproximally concave; anteroproximal and posterior margins of basis with long setae. Pereopod 5 (Fig. 10 K) with bilobed coxa bearing seta on anterior and posterior lobes; anterior margin of basis with robust setae, posterodistal corner weakly lobate. Pereopod 6 (Fig. 11 A) with bilobed coxa bearing two setae on posterior lobe; basis with robust setae on anterior margin, posterodistal corner weakly lobate. Pereopod 7 (Fig. 11 B) with elliptical basis bearing robust setae on anterior margin, posterodistal corner weakly lobate. Coxal gills (Fig. 11 G) ovate with stalks on gnathopod 2 and pereopods 3 - 6. Pleopods 1 - 3 (Fig. 11 C-F) with peduncles longer than rami, bearing distal seta on pleopod 1; retinacula paired (Fig. 11 D); mediobasal margin of inner ramus with bifid plumose setae; rami well developed. Uropod 1 (Fig. 11 I) with peduncle bearing three basofacial robust setae and dorsal robust setae; inner ramus length 0.6 times as long as peduncle, with two medial robust setae and two ventroproximal setae; outer ramus length 0.9 times as long as inner ramus, with two medial and one lateral robust setae. Uropod 2 (Fig. 11 J) with peduncle bearing dorsal robust setae; inner ramus as long as peduncle, bearing two medial and one lateral robust setae; outer ramus length 0.7 times as long as inner ramus, with lateral robust seta. Uropod 3 (Fig. 11 K) with peduncle length 0.3 times as long as outer ramus, bearing robust setae on distal edge; inner ramus length 0.3 times as long as outer ramus, with seta on medial margin; outer ramus 2 - articulate, proximal article with plumose setae on medial margin and robust setae on medial and lateral margins, terminal article length 0.2 times as long as proximal article with subapical setae. Telson (Fig. 11 L) length slightly shorter than width, each lobe with two lateral and three apical robust setae, and two dorsolateral and 1 subapical penicillate setae, cleft for 69 %. Male (NSMT-Cr 30786). Antenna 1 (Fig. 12 A) length 0.24 times as long as body length; accessory flagellum 3 - articulate; primary flagellum 25 - articulate. Antenna 2 (Fig. 12 B) length 0.6 times as long as antenna 1; peduncular article 4 length 0.8 times as long as peduncular article 5; peduncular article 5 and flagellum with calceoli (Fig. 12 C); flagellum 16 - articulate. Gnathopod 1 (Fig. 12 D, E) with carpus length 1.2 times as long as length of propodus and 1.6 times width of carpus; propodus length 1.5 times width. Gnathopod 2 (Fig. 12 F, G) with carpus length 1.1 times as long as length of propodus and 2.3 times width of carpus; propodus length 2.2 times width, palmar margin with two medial and two lateral robust setae. Uropod 3 (Fig. 12 H) with peduncle length 0.4 times as long as outer ramus, peduncle bearing bent robust setae on distal edge.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
9D1D2179706C5BC4BB2F8F49983498F4.taxon	distribution	Distribution and environment. This species has been found in interstitial waters in Tokyo: the sand-filter bed of the Komae Purification Plant near the Tama River (Ueno 1955); two springs - Mamashita Spring, Kunitachi and Hinochūōtoshokan Spring, Hino (this study).	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
A69D72015B56538EABEAA09A41282E03.taxon	description	Figs 2, 3, 4, 5 New Japanese name: Torii-chikayokoebi	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
A69D72015B56538EABEAA09A41282E03.taxon	diagnosis	Diagnosis. Urosomite 3 without dorsal setae. Epimeral plates 2 - 3 without ventral setae. Peduncular article 1 of antenna 1 with robust seta on posterodistal corner. Antenna 2 with peduncular article 2 gland cone not exceeding end of article 3; calceoli present in male. Mandible with 5 - dentate left incisor; left lacinia mobilis 4 - dentate, right one bifid with three or four teeth. Inner plate of maxilla 1 with six plumose setae. Inner plate of maxilla 2 with seven facial seta in oblique row. Peduncle of pleopod 3 with seta. Uropod 1 with peduncle bearing basofacial robust setae. Uropod 3 with inner ramus 0.3 times as long as outer ramus; outer ramus two-ariticulate, with plumose setae on medial margin. Telson length 1.1 times width, cleft for 67 % of length.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
A69D72015B56538EABEAA09A41282E03.taxon	etymology	Etymology. The new species is named after Dr. Takaaki Torii, who collected the species.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
A69D72015B56538EABEAA09A41282E03.taxon	description	Description. Male holotype, NSMT-Cr 16652. Head (Fig. 2 A) as long as pereonites 1 and 2 combined; eyes absent; inferior antennal sinus distinct with rounded angle. Dorsal margins of pleonites 1 - 3 (Figs 2 A, 5 A-C) each with four setae. Epimeral plates 1 - 3 (Figs 2 A, 5 N-P) with weakly pointed posterodistal corners; ventral margins without setae; posterior margins of plates 1 - 3 with one, zero, one seta, respectively. Dorsal margins of urosomites 1 and 2 with robust seta, urosomite 3 dorsally bare. Antenna 1 (Figs 2 A, 3 A) length 0.6 times as long as body; length ratio of peduncular articles 1 - 3 in 1.0: 0.8: 0.4; posterodistal corner of peduncular article 1 with robust seta; accessory flagellum three-articulate (Fig. 3 B); primary flagellum with approximately 22 articles, each article with one aesthetasc (Fig. 3 C). Antenna 2 (Figs 2 A, 3 D) length 0.6 times as long as antenna 1; peduncular article 4 length 0.9 times as long as article 5; right peduncular article 5 with calceoli, left one lacking calceoli; flagellum 16 - articulate, with calceoli (Fig. 3 E). Upper lip (Fig. 2 B) with rounded apical margin bearing fine setae. Mandibles (Fig. 2 C-E) with left and right incisors comprising five and five-six teeth, respectively; left lacinia mobilis comprising four teeth, right lacinia mobilis bifid with three teeth; molar process triturative with plumose seta; length ratio of palp articles 1 - 3 in 1.0: 2.4: 1.9; palp article 1 without setae; palp article 2 with eight marginal setae; palp article 3 with pair of A-setae, many D-setae and E-setae, lateral face with fine setae. Lower lip (Fig. 2 G) lacking inner lobes; outer lobes broad, shoulder rounded, with fine setae. Maxilla 1 (Fig. 2 H-J) with triangular inner lobe, bearing six plumose setae on medial margin; outer plate rectangular, with 11 serrate robust setae apically; palp 2 - articulate, article 1 without setae, article 2 with six robust setae apically. Maxilla 2 (Fig. 2 K) with inner plate bearing seven plumose setae in oblique row. Maxilliped (Fig. 2 L-O) with inner plate reaching end of palp article 1, subquadrate, bearing three subapical robust setae and medial robust seta; outer plate ovate, reaching middle of palp article 2, with row of robust setae along apical to medial margins; palp 4 - articulate, article 2 longest with medial setae, nail of article 4 distinct. Gnathopod 1 (Fig. 3 J, K) with subquadrate coxa bearing setae along anterior to ventral margins; anterior and posterior margins with long setae; carpus length 0.9 times as long as length of propodus and 1.5 times width of carpus; propodus length 1.9 times width, palmar margin weakly serrate, oblique, with three medial and two lateral robust setae; dactylus not reaching posterodistal corner of propodus. Gnathopod 2 (Fig. 3 L, M) with coxa expanded proximally bearing setae along anterior to ventral margins; posterior margin of basis with long setae; carpus length 1.2 times as long as length of propodus and 2.8 times width of carpus; propodus length 2.4 times width, palmar margin weakly serrate, almost vertical, with two medial and two lateral robust setae; dactylus not reaching posterodistal corner of propodus. Pereopod 3 (Fig. 4 A, B) with subquadrate coxa, proximally expanded, bearing setae along anterior to ventral margins; posterior margin of basis with long setae. Pereopod 4 (Fig. 4 D, E) with coxa bearing setae along anterior to ventral margins, posteroproximally concave; posterior margin of basis with long setae. Pereopod 5 (Fig. 4 G, H) with bilobed coxa bearing seta on anterior and posterior lobes; anterior margin of basis with robust setae, posterodistal corner weakly lobate. Pereopod 6 (Fig. 4 J, K) with bilobed coxa bearing seta on posterior lobe; basis ovate, with robust setae on anterior margin, posterodistal corner weakly lobate. Pereopod 7 (Fig. 4 M) with subtriangular coxa bearing seta on posterior margin; basis elliptical, with robust setae on anterior margin, posterodistal corner weakly lobate. Coxal gills (Figs 3 L, 4 A, D, G, J) ovate with stalks on gnathopod 2 and pereopods 3 - 6. Pleopods 1 - 3 (Fig. 5 G-K) with peduncles longer than rami, bearing distal seta on pleopod 2 and proximal seta on pleopod 3; retinacula paired (Fig. 5 H); mediobasal margin of inner ramus with bifid plumose setae (Fig. 5 I); rami well developed. Uropod 1 (Fig. 5 R) with peduncle bearing three basofacial robust setae and dorsal robust setae; inner ramus length 0.7 times as long as peduncle, with two medial and one lateral robust setae, and ventroproximal robust seta; outer ramus length 0.9 times as long as inner ramus, with two robust setae on medial margin. Uropod 2 (Fig. 5 S) with peduncle bearing dorsal robust setae; inner ramus length 0.8 times as long as peduncle, bearing two medial robust setae and two ventroproximal slender setae; outer ramus length 0.6 times as long as inner ramus, without marginal setae. Uropod 3 (Fig. 5 U, V) with peduncle length 0.3 times as long as outer ramus, bearing bent robust setae on distal edge; inner ramus length 0.3 times as long as outer ramus, with two robust setae on medial margin; outer ramus 2 - articulate, proximal article with plumose setae on medial margin and robust setae on medial and lateral margins, terminal article length 0.3 times as long as proximal article with subapical setae. Telson (Fig. 5 X) length 1.1 times width, each lobe with two lateral and three apical robust setae and two dorsolateral penicillate setae, cleft for 67 %. Female paratype, NSMT-Cr 16653. Antenna 1 (Fig. 3 F-H) with peduncles 1 - 3 of which length ratio in 1.0: 0.8: 0.5; accessory flagellum 4 - articulate (Fig. 3 G). Antenna 2 (Fig. 3 I) without calceoli. Incisor of right mandible 6 - dentate (Fig. 2 F); right lacinia mobilis 4 - dentate, weakly bifid. Apical robust setae of inner plate of maxilliped stiffer than those of male (Fig. 2 P). Gnathopod 1 (Fig. 3 N, O) with carpus length 1.8 times width; length of propodus 2.0 times width; dactylus reaching posterodistal corner of propodus. Gnathopod 2 (Fig. 3 P, Q) with dactylus reaching posterodistal corner of propodus. Brood plates (Figs 3 P, 4 I) narrow, lacking setae, on gnathopod 2 and pereopods 3 - 5. Peduncles of pleopods 1 and 3 with three and one setae, respectively (Fig. 5 L, M). Uropod 2 (Fig. 5 T) with inner ramus bearing two medial and one lateral robust setae; outer ramus with medial robust seta. Uropod 3 (Fig. 5 W) with terminal article of outer ramus length 0.2 times as long as proximal article. Telson (Fig. 5 Y) as long as wide, cleft for 71 %.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
A69D72015B56538EABEAA09A41282E03.taxon	distribution	Distribution and environment. The species is known only from its type locality in the Seto River, Shizuoka Prefecture, Japan. Specimens were collected at a depth of 20 cm, from the bank of the river.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
6001069637F95FF197CB8B18B52E4BEC.taxon	diagnosis	Diagnosis. Head without eyes, rostrum short, inferior antennal sinus distinct. Pleonites 1 - 3 with dorsal setae, lacking processes. Urosomite 2 with dorsal robust setae. Antenna 1 longer than antenna 2; accessory flagellum three- or four-articulate. Male antenna 2 with calceoli. Mandible with triturative molar with seta; left incisors five- or six-dentate; left lacinia mobilis four- or five-dentate; palp article 3 with A-, D- and E-setae. Maxilla 1 with inner plate bearing plumose setae; outer plate with 11 serrate robust setae. Inner plate of maxilla 2 with oblique row of facial setae. Gnathopods subchelate. Coxa of pereopod 4 with posterior concavity. Coxal gills with stalks, on gnathopod 2 and pereopods 3 - 6. Uropod 1 with basofacial robust setae on peduncle. Uropod 3 with small, scale-like inner ramus; outer ramus one- or two-articulate. Telson cleft with apical robust setae.	en	Shintani, Aki, Lee, Chi-Woo, Tomikawa, Ko (2022): Two new species add to the diversity of Eoniphargus in subterranean waters of Japan, with molecular phylogeny of the family Mesogammaridae (Crustacea, Amphipoda). Subterranean Biology 44: 21-50, DOI: http://dx.doi.org/10.3897/subtbiol.44.86914, URL: http://dx.doi.org/10.3897/subtbiol.44.86914
