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Taxonomy
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 Chazyan 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), Hansen and Holmer (2011).
It was recombined as Pachyglossella dorsiconvexa by Cooper (1960), Hansen and Holmer (2011).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Pachyglossa dorsiconvexa Cooper p. 225 figs. Plate 11, F, figure 11 ; plate 28, C, figures 7, 8 |
| 1960 | Pachyglossella dorsiconvexa Cooper p. 601 |
| 2011 | Pachyglossella dorsiconvexa Hansen and Holmer |
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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.
†Pachyglossella dorsiconvexa Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell 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. |
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Hendy 2009, Hendy et al. 2009, Nesnidal et al. 2013 | |||||