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Ptychopleurella rectangulata
Taxonomy
Ptychopleurella rectangulata was named by Cooper (1956). Its type specimen is USNM 1110101a and 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.
Subspecies
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Ptychopleurella rectangulata Cooper pp. 389 - 390 figs. Plate 42, D, figures 13-21 |
| 2014 | Ptychopleurella rectangulata Candela and Harper pp. Supplement 1 |
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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.
†Ptychopleurella rectangulata Cooper 1956
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†Ptychopleurella rectangulata laciniata Williams 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell small, subrectangular in outline ; hinge slightly narrower than the greatest shell width ; cardinal extremities obtuse ; sides rounded ; anterior margin slightly emarginate. Surface of the pedicle valve marked medially by a strong, narrow costa extending from the beak to the anterior margin and on each side is intercalated a small costa. Median costa generally elevated above those surrounding it, and the area occupied by the 2 or 3 neighboring costae is flattened. Surface on each side of median costa marked by about 8 costae. Brachial valve marked medianly by a deep sulcus extending from near the beak to the front margin. Sulcus broadly V-shaped in section and occupied by 4 or 5 costae.
Pedicle valve hemiconical, with nearly flat lateral profile and slightly protuberant beak; anterior profile broadly but gently convex. Lateral slopes flattened and moderately steeply inclined. Interarea catacline. Muscle field short, not strongly thickened. Dental plates very short, receding. Apical plate only slightly developed. Brachial valve moderately convex in lateral profile with the greatest curvature at the umbo ; anterior profile bilobed. Flanks bounding sulcus moderately swollen with steep posterolateral slopes but gentle anterior and lateral slopes. Notothyrial platform deep, cardinal process a simple septum ; median ridge reaching slightly anterior to the middle, fairly stout. |