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Cyrtonotella subfissicosta

Rhynchonellata - Orthida - Archaeorthidae

Orthis (Plectorthis) subfissicosta was named by Reed (1917) [= 1883. Orthis intercostata, Portlock, Davidson, Mon. Brit. Foss. Brach., vol. v, Silur. SuppL, p. 226].

It was recombined as Cyrtonotella subfissicostata by Williams (1962); it was recombined as Cyrtonotella subfissicosta by Candela and Harper (2014).

Sister species lacking formal opinion data

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Synonymy list
YearName and author
1917Orthis (Plectorthis) subfissicosta Reed pp. 834 - 835 figs. Plate VI, fig. 21
1962Cyrtonotella subfissicostata Williams pp. 105 - 106 figs. Pl. VIII, figs. 27, 32, 39
2014Cyrtonotella subfissicosta 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
genusCyrtonotellaSchuchert and Cooper 1931

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 1962Semi-elliptical to subquadrate, unequally biconvex to concavo-convex Cyrtonotella with acute angles in immature growth-stages and with a gently convex pedicle valve and a sulcate brachial valve that is slightly convex umbonally and probably gently concave in adult forms; ornamentation fascicostellate with about 13 costeUae per 5 mm. antero-medianly; ventral muscle-scar short, about oneninth as long as the pedicle valve with an acutely triangular adductor track ending in a small median boss, and widely splayed diductor scars not extending very much beyond the traces of abbreviated dental lamellae; cardinal process bulbous posteriorly, passing anteriorly into a broad, low, median ridge, brachiophores short, widely divergent.