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Sowerbyella (Sowerbyella) papiliuncula

Strophomenata - Strophomenida - Sowerbyellidae

Sowerbyella papiliuncula was named by Borissiak (1972) [non 1984 Sowerbyella papiliuncula Borissiak; Klenina, p. 81 (Popov & Cocks 2014: 729).]. Its type specimen is CNIGR 7/9555, a valve (conjoined valves), and it is a 3D body fossil.

It was recombined as Sowerbyella (Sowerbyella) papiliuncula by Popov and Cocks (2014).

Synonymy list
YearName and author
1972Sowerbyella papiliuncula Borissiak p. 183 figs. pl. 49, figs 4–7
1986Sowerbyella tamdysuensis Misius p. 150 figs. pl. 15, figs 1–18, pl. 16, figs 1–6
2014Sowerbyella (Sowerbyella) papiliuncula Popov and Cocks pp. 728-729 figs. 18H, L–U, 19A–D

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyPlectambonitoideaJones 1928
familySowerbyellidaeOpik 1930
subfamilySowerbyellinaeOpik 1930
genusSowerbyellaJones 1928
subgenusSowerbyellaJones 1928
speciespapiliuncula(Borissiak 1972)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

L. E. Popov and L. R. M. Cocks 2014 Shell concavoconvex, transverse, semioval in outline, two-thirds as long as wide, with maximum width at the hinge line and slightly acute cardinal extremities. Weakly paraplicate anterior commissure in mature specimens. Ventral valve lateral profile moderately convex, strongly curved in posterior one-third with an incipient ventral median fold flanked by a pair of shallow sulci in mature specimens. Ventral interarea low, planar, anacline, with a small, apical pseudodeltidium. Dorsal valve moderately concave, but more strongly posteriorly to mid-length, with a weak dorsal median fold. Dorsal interarea low, catacline to slightly hypercline, chilidial plates discrete. Radial ornament parvicostellate. Ribs fine, with very narrow interspaces increasing by bifurcation and intercalation, with 10–11 ribs per mm in mature specimens. Concentric ornament of fine, densely spaced fila. Ventral interior with small transverse teeth supported by incipient dental plates continuing anteriorly as straight, divergent muscle bounding ridges. Muscle field flabellate, bisected by a short, high median ridge and with widely divergent diductor scars extending anteriorly to near midlength. Adductor scars, small, linear, deeply impressed in the umbonal area. Mantle canals strongly impressed, with broad and short vascula media branching immediately in front of the muscle scars. Dorsal interior with undercut cardinal process merged with small, straight, widely divergent socket plates. A pair of high, thin slightly divergent side septa terminating at about three-fifths valve length from the posterior margin. Bema and dorsal adductor scars variably i