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Dinorthis meedsi

Rhynchonellata - Orthida - Plaesiomyidae

Taxonomy
Orthis meedsi was named by Winchell and Schuchert (1892).

It was recombined as Dinorthis (Plaesiomys) meedsi by Schuchert and Cooper (1932); it was recombined as Plaesiomys meedsi by Jin and Norford (1996); it was recombined as Dinorthis meedsi by Schuchert (1897), Schuchert (1897) and Wright and Stigall (2013).

Synonymy list
YearName and author
1892Orthis meedsi Winchell and Schuchert p. 289
1897Dinorthis meedsi Schuchert p. 215
1932Dinorthis (Plaesiomys) meedsi Schuchert and Cooper p. 94
1996Plaesiomys meedsi Jin and Norford pp. 25 - 26 figs. Plate 2, figures 8-15
2013Dinorthis meedsi Wright and Stigall p. 1113

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
RankNameAuthor
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyPlaesiomyidaeSchuchert 1913
subfamilyPlaesiomyinaeSchuchert 1913
genusDinorthisHall and Clarke 1892
speciesmeedsi(Winchell and Schuchert 1892)

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
J. Jin and B. S. Norford 1996Shell small tomedium-sized, subquadrate, nearly equibiconvex;hingeline straight, extending for about four-fifths ofshell width; anterior commissure rectimarginate orweakly sulcate. Ventral umbo small, low, barelyextending posteriorly beyond hingeline, with minutebeak; interarea well developed, about 1 mm high, aswide as hingeline, nearly catacline; delthyrium wide,open; valve with greatest convexity in umbonal area,but without carina, fold, or sulcus. Dorsal umbo flat,with minute median furrow developed anteriorly intoshallow, poorly delimited sulcus; inter area low,orthocline. Entire shell covered by rounded costae,with bifurcation mainly on ventral valve andintercalation on dorsal valve (Pl. 2, figs. 12, 8,respectively), reaching about 7 in 5 mm at anteriormargin.