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Tetraphalerella planobesa

Strophomenata - Strophomenida - Strophomenidae

Taxonomy
Strophomena planobesa was named by Cooper (1956) [= Strophomena sp. Measures, Rohr & Blodgett 1992 p. 200, fig. 8G, H]. Its type specimen is USNM 117740f, a shell, and it is a 3D body fossil. Its type locality is Crystal Creek, 5 miles south of Pikesville, Sequatchie Valley, which is in an Ashbyan shallow subtidal wackestone/packstone in the Murfreesboro Limestone Formation of Tennessee.

It was recombined as Tetraphalerella planobesa by Rasmussen et al. (2012).

Synonymy list
YearName and author
1956Strophomena planobesa Cooper pp. 943 - 944 figs. pl. 261, figs A1–13, B14–17
2012Tetraphalerella planobesa Rasmussen et al. pp. 13 - 14 figs. Plate 1, figures 2–8

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
—PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyStrophomenidaeKing 1846
subfamilyStrophomeninaeKing 1846
genusTetraphalerellaWang 1949
speciesplanobesa()

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.

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Diagnosis
ReferenceDiagnosis
C. M. O. Rasmussen et al. 2012Shell gently biconvex, possibly longer than wide. Ventral valve more convex near the anterior margin; interarea low, wide and apsacline. Dorsal valve sulcate, apparently lacking interarea. Ornamentation unevenly multicostellate, with growth lines developed at every third of valve length.

Ventral interior with widely divergent dental plates. Median septum developed in a single specimen. Dorsal interior with bifid cardinal process extending posteriorly beyond hinge line. Socket ridges fused directly onto lateral bases of the cardinal process lobes. Concavity very pronounced anterior to cardinal process. Brachiophores low, supported by valve floor, widely divergent and slightly recurved towards the hinge line. Dorsal median septum lacking. Pair of low side septa present. Notothyrial platform absent.