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Glyptorthis alta
Taxonomy
Glyptorthis alta was named by Cooper (1956). Its type specimen is USNM 110008, a valve (brachial valve), and it is a 3D body fossil. Its type locality is Goetz quarry, Glen Park, which is in a Trentonian carbonate limestone in the Kimmswick limestone Formation of Missouri.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Glyptorthis alta Cooper p. 361 figs. Plate 44, A, figures 1-5 |
| 2014 | Glyptorthis alta Wright and Stigall pp. Table S2 figs. 3A-B |
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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.
†Glyptorthis alta Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell of moderate size for the genus, hemipyramidal in outline; biconvex; valves of unequal depth. Cardinal extremities obtuse. Lateral margins gently rounded ; front margin broadly rounded. Anterior commissure faintly uniplicate. Surface multicostellate, with 8 costellae occupying a space of 5 mm. at the front, Costellae increasing by intercalation.
Pedicle valve hemipyramidal ; unequally convex in lateral profile, with the umbonal region moderately convex, the midportion of the profile flat and the anterior quarter gently convex. Lateral slopes steep. A narrow, shallow sulcus extends from the umbo to the front margin where it forms a slight tongue, Interarea long, nearly flat, strongly apsacline. Delthyrium long and narrow. Dental plates short, receding ; anterior margin of muscle field thickened. Brachial valve moderately convex in both profiles, somewhat swollen and with moderately steep lateral slopes. Sulcus present on umbo but obsolete toward the front where a narrow fold is barely discernible. Interarea long, deeply concave, orthocline in position. Cardinalia ponderous; median ridge slender. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Aberhan et al. 2004, Nesnidal et al. 2013, Hendy 2009 | |||||
Age range: Trentonian or 457.30000 to 449.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Trentonian | USA (Missouri) | Glyptorthis alta (type locality: 89024) |