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Archinacella powersi
Taxonomy
Archinacella powersi was named by Ulrich and Scofield (1897). It is not extant. Its type specimen is UW o/20359, a shell. Its type locality is Vanuxemia beds, Beloit, which is in a Blackriveran carbonate limestone in the McGregor Formation of Wisconsin. It is the type species of Archinacella.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1897 | Archinacella powersi Ulrich and Scofield |
| 1906 | Archinacella powersi Reed p. 363 |
| 1941 | Archinacella powersi Knight p. 44 figs. pl. 1 f. a-g |
| 1990 | Archinacella powersi Peel figs. f. 3-4 |
| 1999 | Archinacella powersi Peel and Horný p. 101 figs. f. 1-2 |
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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.
†Archinacella powersi Ulrich and Scofield 1897
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Subovate, patelliform gastropods, moderately large, with apex overhanging the anterior margin and with a continuous muscle scar rather broad except where it passes anteriorly beneath the apex; dorsum well arched, lateral slopes very slightly convex, posterior slope as long as the entire shell and gently convex, anterior slope short, nearly vertical, concave; apex bluntly pointed; nucleus not well known but seemingly cap-shaped; apertural margins simple, slightly thickened; plane of the aperture well arched; interior of the shell divided into three zones, an outer bordering convex zone, the rather wide zone of the muscle scar, and an inner zone or area covered by secondary deposits; the muscle scar, slightly impressed in the shell, rather wide and in its wider part horseshoe-shaped except that the two ends of the horseshoe are connected across the front of the shell by a narrow continuation of the scar; ornamentation lines of growth alone, shell seemingly not thick, its structure unknown. The holotype measures about 30 mm. in length, 25 mm. in width, and has a height of about 9 mm. |