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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Rhynchonellata - Orthida - Plaesiomyidae
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).
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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.
|J. Jin and B. S. Norford 1996||Shell 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.|