taxonID	type	description	language	source
03D7878B6E54A501FD1EE36FFC753D12.taxon	etymology	ETYMOLOGY: Named in honor of Walter B. Elvers.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A501FD1EE36FFC753D12.taxon	materials_examined	TYPE SPECIES: Elversella rugosa McRoberts and Newell, new species.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A501FD1EE36FFC753D12.taxon	diagnosis	DIAGNOSIS: Myalinidae with shell retrocrescent (sickle shaped) with discordant valves; left valve larger and more convex than right valve, with ten to fifteen coarse, commarginal rugae; right valve smaller, without ornamentation; shell edentulous, possessing simple opisthodetic duplivincular ligament, ligament grooves slightly curved, intersecting hinge margin at an angle of less than 45 °.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A503FD1AE1B5FB4A3DA0.taxon	description	new species Figure 2	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A503FD1AE1B5FB4A3DA0.taxon	etymology	ETYMOLOGY: Specific name refers to rugose ornamentation on the left valve.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A503FD1AE1B5FB4A3DA0.taxon	diagnosis	DIAGNOSIS: As for the genus.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A503FD1AE1B5FB4A3DA0.taxon	description	DESCRIPTION: The valves are moderately small (maximum dimension generally less than 5 cm). In profile, the beaks are conspicuous and extended forward above a broad and shallow anterior sinus. The umbonal ridge, which is poorly defined in later growth stages, curves down and backward at the margins, forming an angle of less than 45 ° with the hinge at the rounded posteroventral extremity. The specimens bear five or six duplivincular ligament grooves that are slightly curved and intersect the hinge margin at an angle slightly less than 30 ° (figs. 2.1, 2.5). The left valve bears as many as 15 coarse commarginal rugae, whereas the right valve is less convex and nearly smooth. Between the coarse rugae of the left valve are numerous fine commarginal growth lines. The right valve margin below the hinge lies well within the edge of left valve; each valve bears a small posterodorsal auricle above a rounded sinus and byssal gape (figs. 2.1, 2.3 A). The specimens contain a poorly preserved, but simple and continuous pallial line roughly parallel to the posteroventral margin (fig. 2.5). Further details of the musculature and shell microstructure are unknown due to poor preservation.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A503FD1AE1B5FB4A3DA0.taxon	materials_examined	MATERIAL AND MEASUREMENTS: Our specimens are few and incomplete around the margins due to predepositional wear and breakage. The inequality in valve size suggests that some dissolution of the outer shell layer of the right valve, which may have been composed of conchiolin, occurred prior to silicification. The measurements (table 1) of the five specimens shown in figure 2 indicate variability and approximate size for the species.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
03D7878B6E54A503FD1AE1B5FB4A3DA0.taxon	discussion	DISCUSSION: This myalinid species is unlike any known to us. Elversella rugosa appears similar in outline and ornamentation to one of the several specimens Girty (1908: pl. 29, fig. 15) attributed to Myalina squamosa Sowerby from the Permian of the Glass Mts. and may therefore be conspecific. However, other Permian specimens attributed by Girty to M. squamosa (e. g, Girty, 1908: pl. 16, fig. 22) bear distinctively different ornamentation and lack an anterior auricle; therefore, they clearly represent a different species. Elversella rugosa superficially resembles the equivalved Septimyalina burmai Newell, (1942: pl. 12, fig. 4) from the Florena Shale, (Wolfcampian); however, the new species lacks the umbonal septum of that form. E. rugosa is similar to several Aviculomyalina species known from Lower and Middle Triassic localities in Europe and North America (e. g., Assmann, 1937; McLearn, 1941). Unlike Elversella rugosa, however, Aviculomyalina is equivalved and possesses a smaller umbonal angle. Considering its inequivalved condition, we interpret E. rugosa to have been pleurothetic, and epibyssate, resting on the right valve.	en	Mc ROBERTS, CHRISTOPHER A., NEWELL, NORMAN D. (2001): A New Permian Myalinid Genus, Elversella, of West Texas. American Museum Novitates 3311 (1): 1-8, DOI: 10.1206/0003-0082(2001)311<0001:ANPMGE>2.0.CO;2, URL: http://dx.doi.org/10.1206/0003-0082(2001)311<0001:anpmge>2.0.co;2
