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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Sowerbyella (Sowerbyella) sinensis
Strophomenata - Strophomenida - Sowerbyellidae
It was recombined as Sowerbyella (Sowerbyella) sinensis by Wang et al. (1998).
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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.
|I. F. Nikitin et al. 2003||Shell concavoconvex, outline semioval, about 65% as long as wide and about 145% as thick as long. Cardinal extremities slightly acute to near right angled. Ante − rior margin broadly and evenly rounded, commissure recti− marginate. Ventral valve moderately and evenly convex in lateral profile, slightly carinate posteriorly in some speci− mens. Ventral interarea low, apsacline with a convex, apical pseudodeltidium. Dorsal valve gently and evenly concave, about 60% as long as wide. Dorsal interarea linear, anacline with discrete chilidial plates united apically. Radial ornament finely and unequally parvicostellate, with accentuated costellae of three generations separated by 2 to 3 parvi−costellae in the interspaces and with up to 14 to 16 costellae per 3 mm at the anterior margin of mature specimens.
Ventral valve interior with teeth supported by short, low dental plates extending basally into divergent muscle− bounding ridges flanking a flabellate muscle field. Diductor scars large, rhomboidal, divided posteriorly by small, lanceo− late adductor scars which are bisected by a short median ridge. Mantle canals lemniscate with straight, divergent vascula media. Dorsal interior with a trifid, undercut cardinal process, which is ankylosed to low, short socket plates. Bema low, subcircular, distinguished only in adult specimens, about 60 to 70% as long and 40% as wide as the valve. Inner side septa prominent, forming the inner edges of the bema in adult specimens. A short median septum and a second pair of widely divergent outer side septa are developed in some adult shells, but are not characteristic of most specimens.