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Pachyglossella dorsiconvexa

Lingulata - Lingulida - Obolidae

Pachyglossa dorsiconvexa was named by Cooper (1956). Its type specimen is USNM 116758a and is a 3D body fossil. Its type locality is 0.2 miles southeast of Pratt Ferry, which is in a Chazy open shallow subtidal limestone in the Pratt Ferry Formation of Alabama. It is the type species of Pachyglossella.

It was recombined as Pachyglossella dorsiconvexa by Cooper (1960) and Hansen and Holmer (2011).

Synonymy list
YearName and author
1956Pachyglossa dorsiconvexa Cooper p. 225 figs. Plate 11, F, figure 11 ; plate 28, C, figures 7, 8
1960Pachyglossella dorsiconvexa Cooper p. 601
2011Pachyglossella dorsiconvexa Hansen and Holmer

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phylumBrachiopodaCuvier 1805
subphylumLinguliformeaWilliams et al. 1996
classLingulataGorjansky and Popov 1985
orderLingulidaWaagen 1885
superfamilyLinguloideaMenke 1828
familyObolidaeKing 1846
genusPachyglossellaCooper 1960
speciesdorsiconvexa(Cooper 1956)

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.

G. A. Cooper 1956Shell small, brown to blue-gray in color, elliptical in outline with the length slightly greater than the width ; greatest width at the middle. Pedicle valve with the posterolateral margins nearly straight and forming an apical angle of about 80° ; sides gently rounded ; anterior margin narrowly rounded ; pedicle valve with lateral profile gently convex and with the greatest convexity at about the middle; anterior and posterior slopes gentle ; anterior profile moderately convex. Pedicle interior with deep pedicle groove between lateral folds.

Brachial valve with subequally rounded extremities and gently rounded sides ; lateral profile strongly convex; greatest depth about one-third the length from the beak; anterior slope long and gentle; anterior profile somewhat narrowly rounded and with steep lateral slopes. Beak marginal. Surface of both valves marked by irregular, strong concentric undulations.

Brachial interior with thickened posterior margin which is not inflected. Muscle pattern not clear.