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Eridorthis inexpecta
Taxonomy
Eridorthis inexpecta was named by Cooper (1956). Its type specimen is USNM 110104a, a valve (pedicle valve), and it is a 3D body fossil. Its type locality is Porterfield Quarry, 5 miles northeast of Saltville, which is in an Ashbyan reef, buildup or bioherm limestone in the Edinburg Formation of Virginia.
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Eridorthis inexpecta Cooper pp. 384 - 385 figs. Plate 48, A, figures 1-6 |
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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.
†Eridorthis inexpecta Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell large for the genus, superficially resembling Oxoplecia. Subrectangular in outline, wider than long, with narrowly rounded cardinal extremities. Lateral margins broadly rounded, anterior margin broadly rounded. Surface costellate, with 7 to 9 narrowly rounded costellae separated by spaces in width about equal to the width of the costellae; strong concentric lamellae undulate over the costellae and are spaced about 4 to the millimeter.
Pedicle valve unevenly convex in lateral profile with the most convexity in the posterior half, the anterior half being somewhat flattened. Beak broadly obtuse, extending slightly posterior to the posterior margin. Sulcus originating about 3 mm. anterior to the beak, widening gradually to occupy somewhat more than a third of the width at the front. Sulcus deepening anteriorly to form a short rounded tongue. Sulcus bounded by narrowly elevated folds raised above the flanks which are flattened to slightly concave and slope moderately steeply to the margins. Interarea fairly long, strongly apsacline, slightly curved, and with a narrow, open delthyrium. Musculature like Glyptorthis. Brachial valve moderately convex in lateral profile with the anterior third slightly more convex and the maximum convexity at about the middle. Anterior profile broadly convex. Umbo sulcate, sulcus shallow and short, becoming a fold between 3 and 4 mm. from the beak. Fold low and rounded but well differentiated from the flanks which are gently convex and fairly steep sided. |