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Transridgeia costata

Strophomenata - Strophomenida - Strophomenidae

Taxonomy
Transridgeia costata was named by Rasmussen et al. (2012). Its type specimen is MGUH 29451 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. It is the type species of Transridgeia.

Synonymy list
YearName and author
2012Transridgeia costata Rasmussen et al. p. 14 figs. Plate 1, figures 9–13

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyStrophomenidaeKing 1846
subfamilyFurcitellinaeWilliams 1965
genusTransridgeia
speciescostata

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 large, concavo-convex, wider than long, with subcircular outline. Interareas low, wide. Delthyrium high, moderately wide, covered completely by dental plates. Notothyrium wide, partly covered by apical chilidium. Ornamentation consists of 10–11 simple costae. Cardinal process bifid. Dorsal median septum surrounded by a complex arrangement of side septa and transverse ridges on a bemalike structure.