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Glyptorthis equiconvexa
Taxonomy
Glyptorthis equiconvexa was named by Cooper (1956). Its type specimen is USNM 116934b, a valve, and it is a 3D body fossil. Its type locality is U. S. Highway 40 Roadcut, just west of Conococheague Creek at Wilson, which is in a Blackriveran carbonate limestone in the Chambersburg Formation of Maryland.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Glyptorthis equiconvexa Cooper pp. 368 - 369 figs. Plate 47, D, figures 18-30; plate 108, C, figures 15-18 |
| 2014 | Glyptorthis equiconvexa Wright and Stigall pp. Table S2 |
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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 equiconvexa Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell fairly large for the genus, subquadrate in outline but with the width slightly greater than the length ; valves of nearly equal depth ; anterior commissure broadly uniplicate ; hinge narrower than the width at the middle; sides nearly straight; anterolateral extremities narrowly rounded; anterior margin gently rounded to somewhat truncated. Surface costellate; costellae unequal in size, appearing in 4 generations ; about 5 costellae in 5 mm. at the front margin ; imbrications fairly closely crowded.
Pedicle valve fairly strongly and evenly convex in lateral profile with the greatest convexity at about the middle; anterior profile s'vollen in the median region and with gently dipping lateral slopes. Beak incurved ; umbo swollen and with steep umbonal slopes; sulcus originating about 4 mm. anterior to the beak, deepening and widening anteriorly but never attaining great depth ; width of sulcus about one-third shell width. Flanks bounding sulcus gently swollen; posterolateral slopes short, moderately steep. Interarea moderately long, almost orthocline, gently curved; beak incurved; delthyrium narrow. Brachial valve unevenly convex in lateral profile with the umbonal region strongly curv~d but the remainder of the valve gently convex; anterior profile swollen and fairly evenly convex; umbo strongly curved and swollen; umbo sulcate, sulcus narrow, short, becoming obsolete about 6 mm. anterior to the beak; fold low, indistinctly defined from about 6 mm. anterior to the beak to the front margin; flanks bounding fold inflated; umbonal slopes to the small depressed posterolateral areas short and steep. Beak strongly incurved; interarea short and curved. Pedicle interior with short, receding dental plates ; deep delthyrial cavity with well-impressed muscle area somewhat elevated at its anterior end; vascula media slightly divergent, short; reniform ovarian markings moderately impressed. Brachial interior with deep notothyrial chamber, strongly elevated notothyrial platform; thin cardinal process and stout divergent brachiophores. Median ridge low, extending to the middle. |