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Paucicrura cristata
Taxonomy
Cristiferina cristata was named by Cooper (1956). Its type specimen is USNM 111794g, a shell, and it is a 3D body fossil.
It was recombined as Paucicrura cristata by Candela and Harper (2014).
It was recombined as Paucicrura cristata by Candela and Harper (2014).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Cristiferina cristata Cooper pp. 962 - 963 figs. Plate 157, E, figures 15-17; plate IS7, G, figures 25-29; plate 158, C, figures 12-14; plate 160, C, |
| 1962 | Cristiferina cristata Williams pp. 138 - 139 figs. Pl. XII, figs. 31, 32, 55, 56 |
| 2014 | Paucicrura cristata Candela and Harper p. SI |
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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.
†Paucicrura cristata Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Subcircular in outline, sides and anterior margins well rounded ; anterior margin gently sulcate ; costellae numbering 2, rarely 3 to the millimeter at the front margin. Pedicle valve fairly evenly and moderately convex in lateral profile; anterior profile strongly convex and with long, moderatety steep slopes ; beak moderately long, strongly incurved; umbo narrowly convex, the convexity extending to a point anterior to the middle but becoming vague thereafter ; anterior slope short and steep; lateral slopes long and steep. Interarea moderately long, curved, apsacline. Delthyrium nearly plugged by the crest of the cardinal process.
Brachial valve gently and fairly evenly convex in lateral profile ; anterior profile broadly and gently concave in the median region but with gently convex lateral areas ; median region fairly strongly sulcate, the sulcus extending nearly to the anterior margin but becoming very shallow in its anterior limit. Flanks bounding sulcus gently swollen ; lateral slopes short and gentle. | |
| A. Williams 1962 | Small, subeircular to subquadrate, unequally biconvex Cristiferina, with an evenly convex pedicle valve about one-third as deep as long and a shallowly sulcate brachial valve almost two-thirds as long as wide and about one-seventh as deep as long; ornamentation strongly costellate with fully developed internal secondaries at the 2-mm. stage of growth; cardinal process crested, high, continuous anteriorly with a low median ridge dividing the dorsal adductor field into a pair of elongately elliptical impressions about two-fifths as long as the brachial valve; ventral muscle-scar squat, about three-quarters as long as wide and about one-quarter as long as the pedicle valve, but not extending greatly beyond the slightly divergent dental lamellae. |