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Sowerbyella (Sowerbyella) rectangularis
Taxonomy
Sowerbyella (Sowerbyella) rectangularis was named by Rasmussen et al. (2012). Its type specimen is MGUH 29473 and is a 3D body fossil. Its type locality is Locality A-1230 Blocks 4-6, which is in an Ashbyan deep subtidal ramp limestone/siltstone in the Telsitna Formation of Alaska.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2012 | Sowerbyella (Sowerbyella) rectangularis Rasmussen et al. p. 19 figs. Plate 2, figures 19–24 |
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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.
†Sowerbyella (Sowerbyella) rectangularis Rasmussen et al. 2012
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. M. O. Rasmussen et al. 2012 | Shell small, moderately to weakly concavo- convex, with transverse outline. Interareas low, covered partly by pseudodeltidium and chilidial plates, respectively. Dense, unequally parvicostellate ornament separated by 12 to 14 accentuated costae. Ventral muscle field bilobed, cordate. Short, thick ventral median septum. Cardinal process trifid, undercut. Dorsal median septum absent. |