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Dinorthis carrickensis

Rhynchonellata - Orthida - Plaesiomyidae

Orthis (Dinorthis) flabellulum carrickensis was named by Reed (1917).

It was recombined as Dinorthis carrickensis by Williams (1962) and Candela and Harper (2014).

Synonymy list
YearName and author
1917Orthis (Dinorthis) flabellulum carrickensis Reed p. 837 figs. pl. vii, figs. 2-6.
1962Dinorthis carrickensis Williams pp. 116 - 117 figs. Pl. X, figs. 2-5
2014Dinorthis carrickensis Candela and Harper pp. Supplement 1

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phylumBrachiopodaCuvier 1805
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderOrthidinaSchuchert and Cooper 1932
superfamilyOrthoideaWoodward 1852
familyPlaesiomyidaeSchuchert 1913
subfamilyPlaesiomyinaeSchuchert 1913
genusDinorthisHall and Clarke 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.

A. Williams 1962Large, subquadrate Dinorthis with a convex brachial valve lacking a median sulcus and even developing a slight median fold and a plane to slightly concave pedicle valve, with a convex umbo and a slight antero-median sulcus; radial ornamentation consisting of narrowly rounded ribs separated by wide interspaces, especially medianly, where their mean wave-length is just over 1 mm. at 7.5 mm. anterior to the umbo, pattern coarsely costellate with secondary branches conspicuous in sectors I to V only after the 10-mm. growth-stage; dental lamellae well developed, narrowly divergent, and forming no more than posterior boundaries to a large, subtriangular muscle-field, longer than wide and strongly elevated on a platform of secondary shell substance; cardinal process massive, lobate, with crenulated posterior face and ankylosed together with stout, rounded brachiophore bases to a narrow notothyrial platform extended anteriorly as a short median ridge; dorsal adductor scars poorly impressed, not extending anteriorly for more than one-quarter the length of the valve.