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Sowerbyella (Sowerbyella) rectangularis

Strophomenata - Strophomenida - Sowerbyellidae

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.

Synonymy list
YearName and author
2012Sowerbyella (Sowerbyella) rectangularis Rasmussen et al. p. 19 figs. Plate 2, figures 19–24

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
RankNameAuthor
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyPlectambonitoideaJones 1928
familySowerbyellidaeOpik 1930
subfamilySowerbyellinaeOpik 1930
genusSowerbyellaJones 1928
subgenusSowerbyellaJones 1928
speciesrectangularis

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.

Diagnosis
ReferenceDiagnosis
C. M. O. Rasmussen et al. 2012Shell 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.