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Plectorthis australis
Taxonomy
Plectorthis australis was named by Cooper (1956). Its type specimen is USNM 117019a, a shell, and it is a 3D body fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Plectorthis australis Cooper pp. 447 - 448 figs. Plate 71, E, figures 21-26 |
| 1962 | Plectorthis australis Williams pp. 122 - 123 figs. Pl. XI, figs. 4, 8, 9 |
| 2014 | Plectorthis australis 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.
†Plectorthis australis Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell of about medium size for the genus, subquadrate in outline, slightly wider than long ; hinge narrow ; greatest width at about the middle ; sides and anterior margin gently rounded; anterior commissure rectimarginate. Surface marked by about 44 narrowly rounded, elevated costae intercalated in 2 generations and an incipient one appearing at the front margin.
Pedicle valve gently convex in lateral profile with the greatest convexity appearing just anterior to the umbo ; anterior broadly convex with the median region somewhat narrowly rounded ; umbo and median region somewhat narrowly swollen ; anteromedian region and flanks moderately inflated ; lateral slopes to margin long and moderately steep. Interarea short, curved, gently apsacline. Brachial valve gently convex in lateral profile with the maximum depth occurring at about the middle; anterior profile broadly and gently convex and with median region depressed slightly into a shallow sulcus. Umbo moderately swollen; sulcus originating on the umbo, shallow, widening but not deepening to the anterior margin where it is occupied by about 4 costae. Flanks bounding sulcus gently swollen with short and gentle slopes to the margins. | |
| A. Williams 1962 | Subquadrate Plectorthis, biconvex in profile with a well-developed wide sulcus in the brachial valve; ornamentation costellate, with a third generation of costellae intercalated between the primary and secondary ribs at the periphery of the shell. |