taxonID	type	description	language	source
2E1487FCF374EA3DFF01FF43FB656A9A.taxon	diagnosis	Frenguelli (1933) provided a brief description of E. luna var. aequalis, pointing that specimens from Iberá showed a lower stria density than those originally described by Hustedt (Table 1). For describing E. luna var. aequalis f. paucistriata, Frenguelli only mentioned that it differed from E. luna var. aequalis by its more distantly and irregularly spaced striae.	en	Guerrero, José M., Vouilloud, Amelia A. (2022): Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status. Phytotaxa 561 (3): 291-300, DOI: 10.11646/phytotaxa.561.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.561.3.5
2E1487FCF374EA3DFF01FF43FB656A9A.taxon	description	The valve of E. luna var. aequalis illustrated by Frenguelli (here reproduced in Fig. 1) has a convex dorsal margin and a slightly concave to almost straight ventral margin, ends broadly cuneate and terminal nodules moderately distant from the poles. The striae are evenly spaced, alternate with very short striae at both dorsal and ventral margins, and become radiate and more densely arranged towards the poles. In comparison, the valve of E. luna var. aequalis f. paucistriata depicted by Frenguelli (here reproduced in Fig. 2) is slightly more arcuate, with ends nose-like protracted and barely ventrally deflected. The striae are less dense and irregularly distributed, alternate with distinct short striae at both margins, and become abruptly denser at the apices.	en	Guerrero, José M., Vouilloud, Amelia A. (2022): Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status. Phytotaxa 561 (3): 291-300, DOI: 10.11646/phytotaxa.561.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.561.3.5
2E1487FCF374EA3DFF01FF43FB656A9A.taxon	discussion	After examining with LM the slides corresponding to the series above mentioned, we found valves ranging from large and more arcuate to small and with the ventral margin almost straight (Figs 3 – 15). Regarding the striation pattern, some of these specimens can be affiliated either to E. luna var. aequalis (Figs 4, 8 – 9, 11) or to E. luna f. paucistriata (Figs 5, 13, 15), but other ones exhibit intermediate morphologies and could not be undoubtedly assigned to one of them (Figs 3, 6 – 7, 10, 12, 14), thus hindering a clear differentiation of both taxa (see Table 1 for morphometric data). Examined with SEM (Figs 16 – 26), external valve face is smooth with uniseriate striae, parallel to slightly radial (Figs 16 – 18). At the apices striae become strongly radial and surround the terminal raphe fissure (Fig. 19). Dorsal valve mantle is perpendicular to valve face and shows striae more densely arranged (Fig. 20), some of which extend a short way onto the valve face. Valve face is delimited from ventral mantle by a marginal, unornamented ridge (Figs 16 – 18). Areolae are round, small and located in shallow depressions with scalloped margins (Fig. 19). Raphe sternum narrow with a filiform raphe positioned on the ventral mantle (Fig. 26), with distal endings turned towards the valve face (Fig. 19). The areolation pattern in the mantle between the raphe and the valve margin is denser and more disorganized than in the rest of the mantle (Fig. 26, arrows). No spines were observed. Internally areola openings are round and located in narrow troughs (Figs 21 – 25). Raphe terminates in well-developed helictoglossae, positioned ventrally on the valve face and somewhat distant from the apices (Fig. 24). One rimoportula apically positioned on the valve mantle (Fig. 21), opening internally through two parallel, sessile lips (Fig. 24); its external opening is indistinct. None of the specimens observed with SEM could be undoubtedly ascribed to either of the two taxa reported by Frenguelli.	en	Guerrero, José M., Vouilloud, Amelia A. (2022): Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status. Phytotaxa 561 (3): 291-300, DOI: 10.11646/phytotaxa.561.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.561.3.5
2E1487FCF372EA3DFF01FAE5FD836CBC.taxon	description	According to the original description (Frenguelli 1933), E. luna var. aequalis f. major differs from E. luna var. aequalis by its longer valves, with striae somewhat irregularly distributed. The valve illustrated by the author (here reproduced in Fig. 27) is elongated, with parallel margins and broadly cuneate, ventrally deflected apices. Striae are parallel and become more densely spaced at the apices, where they flank the terminal nodule (see Table 1 for morphometric data). The specimens from the original material observed with LM (Figs 28 – 33) fit rather well the original description of this form, although valve dimensions are lower than those reported by the author whereas stria densities are higher than originally reported, this difference being more marked for mid valve striae (Table 1). Additionally, most specimens exhibit short dorsal striae variably extending onto the valve face (Figs 28, 30 – 31, 33 – 34), which were not depicted in the original illustration. Under SEM (Figs 34 – 36) we only found one valve of this form, in internal view and slightly tilted positioned, with the closed valvocopula attached. Internal areola openings are round and are located in narrow troughs (Fig. 35). Due to the presence of detrital material that partially covers the valve, no details are visible regarding the internal raphe fissure and the presence of rimoportulae. The portion of the mantle visible shows the filiform raphe with its simple proximal end (Fig. 36). The areolation pattern between the raphe and the valve margin is denser and more disorganized than in the rest of the mantle (Fig. 36).	en	Guerrero, José M., Vouilloud, Amelia A. (2022): Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status. Phytotaxa 561 (3): 291-300, DOI: 10.11646/phytotaxa.561.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.561.3.5
2E1487FCF371EA3EFF01F8D1FCF16CF4.taxon	materials_examined	Type: — ARGENTINA. Corrientes, Estero del Carambola, Esteros del Iberá, 28 º 28 ’ 29 ” S, 57 º 49 ’ 46 ” W, J. Frenguelli, December 8 th, 1923. Lectotype (here designated): Frenguelli Collection! Series 265, slide 265 (10), England Finder Q / 37 – 2 = Fig. 32. Additionally, we propose the following nomenclatural updates:	en	Guerrero, José M., Vouilloud, Amelia A. (2022): Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status. Phytotaxa 561 (3): 291-300, DOI: 10.11646/phytotaxa.561.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.561.3.5
2E1487FCF371EA3EFF01F985FBC56DF3.taxon	materials_examined	Type: — ARGENTINA. Corrientes, Laguna Itatí-Rincón, Esteros del Iberá, 28 º 42 ’ 26 ” S, 58 º 6 ’ 45 ” W, T. Zanni, November 1922. Lectotype (here designated): Frenguelli Collection Series 268, slide 268 (2), England Finder K / 44 – 1 = Fig. 13.	en	Guerrero, José M., Vouilloud, Amelia A. (2022): Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status. Phytotaxa 561 (3): 291-300, DOI: 10.11646/phytotaxa.561.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.561.3.5
2E1487FCF37EEA31FF01FEABFC506AD5.taxon	etymology	Etymology: — named in honor of our friend and colleague Silvia Sala, Museo de La Plata.	en	Guerrero, José M., Vouilloud, Amelia A. (2022): Taxonomic revision of Eunotia luna var. aequalis f. paucistriata Frenguelli and E. luna var. aequalis f. major Frenguelli: analysis of type material, lectotypification and current taxonomic status. Phytotaxa 561 (3): 291-300, DOI: 10.11646/phytotaxa.561.3.5, URL: http://dx.doi.org/10.11646/phytotaxa.561.3.5
