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Parastrophinella thraivensis
Taxonomy
Parastrophia thraivensis was named by Reed (1917).
It was recombined as Parastrophinella thraivensis by Williams (1962) and Candela and Harper (2014).
It was recombined as Parastrophinella thraivensis by Williams (1962) and Candela and Harper (2014).
Synonymy list
| Year | Name and author |
|---|---|
| 1917 | Parastrophia thraivensis Reed pp. 930 figs. Plate XXII, figs. 44, 45 |
| 1962 | Parastrophinella thraivensis Williams pp. 229 - 230 figs. Pl. XXIII, figs. 26, 31, 33 |
| 2014 | Parastrophinella thraivensis 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.
†Parastrophinella thraivensis Reed 1917
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell strongly biconvex, with deeply re-entrant valves, subcircular; beaks low, obtuse, approximate. Pedicle-valve with deep sinus increasing in width and depth anteriorly, with sharp prominent angular edges, and with flattened floor produced into blunt tongue, and bearing in anterior half 2 small closely placed plications of equal size ; sides of sinus steep, high ; lateral lobes of valve bearing 3—4 coarse subangular plications arising at about half the length of valve, those bordering the sinus being the longest, sharpest, and most prominent. Interior of pedicle-valve with short narrow spondylium and median septum extending from it about one-third the length of valve.
Brachial valve strongly convex, with median fold composed of a pair of broader lateral subangular plications and a smaller narrower median one, all continuous from beak to margin and subparallel; lateral lobes with 3-4 lower plications shorter and arising nearer margin. Surface of shell marked by few strong concentric growth ridges. | |
| A. Williams 1962 | Transversely subcircular, strongly and unequally biconvex Parastrophinella with a tumid brachial valve, over four-fifths as long as wide and curving posteriorly above the level of the umbo of the pedicle valve, which is about three-fifths as deep as the brachial one; dorsal fold and complementary ventral sulcus arising about 4 mm. anterior to the umbones, fold tending to be flat-topped posteriorly but becoming more angular anteriorly with the development of a strong median costa; faint depressions on either side of the median costa exceptionally impressed to delineate an incipient pair of submedian costae between it and the lateral pair bounding the fold; lateral areas inflated and bearing up to 4 pairs of costae along the margins; spondylium small, tending to be sessile posteriorly; cruralium sessile posteriorly cornposed of high, narrowly divergent, outer plates, median septum extending anteriorly for just over onehalf of the length of the brachial valve. |