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Skenidioides costatus
Taxonomy
Skenidioides costatus was named by Cooper (1956). Its type specimen is USNM 117072f, a shell, and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Skenidioides costatus Cooper pp. 493 - 494 figs. Plate 97, D, figures 38-48 |
| 1963 | Skenidioides costatus Williams pp. 375 - 377 figs. PI. 4, figs. 7-14 |
| 1984 | Skenidioides costatus Harper and Owen p. 28 figs. pl. 2 f. 17-20; pl. 3 f. 1-6 |
| 2014 | Skenidioides costatus 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.
†Skenidioides costatus Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell of about usual size for the genus, wider than long, with acutely angular and slightly auriculate cardinal extremities, gently sloping lateral margins, and broadly rounded to truncate anterior margin. Lateral profile planoconvex. Surface marked by about 19 to 21 strong costellae in the adult. The costellae appear in 3 generations. In a young valve 1.5 mm. in length, 13 primary costae are present which increase by intercalation to 19 or 21. In all stages of growth the median costa is stronger and more elevated than the others and forms a fold. Intercalation on each side of median costa takes place about one-third the length from the beak.
Pedicle valve evenly and strongly convex in lateral profile with the greatest convexity located at about the middle ; in anterior profile this valve is subcarinate and the central costa is slightly elevated above those forming the flanks. Flanks flat in profile and moderately steep. Interarea long, slightly curved near the beak, and strongly apsacline. Brachial valve flat in anterior profile. Umbo slightly convex, but just anterior to it a narrow sulcus forms which deepens and widens rapidly anteriorly to occupy about half the width of the valve at the front. Seven costae occupy the sulcus. Shell surface between the costae bounding the sulcus and the cardinal extremities perceptibly but only slightly concave. Interior: Pedicle valve with long, slender teeth and short, shallow free spondylium. Median septum of brachial valve moderately thick and greatly elevated, so that the valve is separated into two parts. Notothyrial cavity shallow and narrow ; brachiophores long and slender. |