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Antitrochus arietinus
Taxonomy
Antitrochus arietinus was named by Whidborne (1891). It is not extant. Its type locality is Wolborough Quarry, on the east side of the A381 due east of Wolborough church, which is in a Givetian carbonate limestone in the Torquay Formation of the United Kingdom. It is the type species of Antitrochus.
Synonymy list
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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.
†Antitrochus arietinus Whidborne 1891
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Trochiform, sinistral gastropods without sinus, slit, or selenizone and with strong transverse and revolving ornamentation; whorl profile very round; sutures very deep; the body whorl occupying about three quarters of the total height; base flatly rounded, seemingly narrowly phaneromphalous; characters of the columellar lip not definitely known but seemingly sharp and reflexed; outer lip oblique, with neither slit nor sinus; earlier whorls unknown; ornamentation of two sorts, revolving and transverse, giving a reticulate appearance to the surface; revolving ornamentation typically about 20 sharply elevated revolving lirae with wide interspaces, the 10 lirae above the suture being more widely spaced than those on the base, but the number of lirae may be nearly doubled through the intercalation of finer lirae in the interspaces; transverse ornamentation very much finer lirae which sweep obliquely backward from the upper suture, being distinctly convex forward above. The holotype, a specimen of five later whorls, measures 18 mm. in height and about 15 mm. in width. Its pleural angle is about 55 degrees. |