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Plaesiomys subquadratus

Rhynchonellata - Orthida - Plaesiomyidae

Taxonomy
Orthis subquadrata was named by Hall (1847) [Orthis Subquadrata]. It is a 3D body fossil.

It was recombined as Plaesiomys subquadrata by Hall and Clarke (1892) and Jin and Zhan (2008); it was recombined as Dinorthis (Plaesiomys) subquadrata by Schuchert and Cooper (1932) and Alikhova (1953); it was recombined as Plaesiomys subquadratus by Howe (1966), Jin et al. (1997) and Wright and Stigall (2013).

Synonymy list
YearName and author
1892Plaesiomys subquadrata Hall and Clarke p. 196,197 figs. PI. 5A, figs. 17-19
1932Dinorthis (Plaesiomys) subquadrata Schuchert and Cooper figs. PI. 10, figs. 15,17,18,24-26.
1953Dinorthis (Plaesiomys) subquadrata Alikhova
1966Plaesiomys subquadratus Howe pp. 247 - 249 figs. PI. 29, figs. 1-6; Text-fig. 2J
1997Plaesiomys subquadratus Jin et al. p. 20 figs. Plate 1, figures 1-4
2008Plaesiomys subquadrata Jin and Zhan p. 17
2013Plaesiomys subquadratus Wright and Stigall pp. 1120 - 1121 figs. 6.1 - 6.4

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
—PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyPlaesiomyidaeSchuchert 1913
subfamilyPlaesiomyinaeSchuchert 1913
genusPlaesiomysHall and Clarke 1892
speciessubquadratus(Hall 1847)

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
D. F. Wright and A. L. Stigall 2013Large Plaesiomys species with wide, subquadrate shells characterized by high costal density. Valve convexity and inflation are variable, but valves are typically convexoconcave to dorsibiconvex; sulcus originates proximally; ventral muscle scars moderate to long, adjustor muscle scars variable; ventral and dorsal umbonal angles low. Emended from Hall (1847).