|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Paragastropoda - Mimospirida - Onychochilidae
Is something missing? Join the Paleobiology Database and enter the data
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.
|J. B. Knight 1941||Rather small, sinistral, anomphalous, subtrochiform gastropods with a deep U-shaped sinus in the outer lip; whorl profile strongly arched between sutures, rather flatly arched and subangular below on the final whorl; sutures moderately deep; base somewhat flattened, anomphalous; nucleus unknown; columellar lip sinuous, with a slightly thickened margin; parietal lip restricted, seemingly with a thin inductura; outer lip with a deep U-shaped sinus rather low on the lip, the margin seemingly leaving the upper suture with gentle backward obliquity, but rounding strongly backward and downward into the sinus where it turns roundly to a strong forward obliquity at the subangular junction of the side and the base, and turns gently with forward convexity on the base to a gentle backward obliquity as the columella is reached; ornamentation seemingly transverse lines of growth and broad, wavelike transverse undulations; shell structure unknown. The holotype measures about 11 mm. in height and 7| mm. in width, with a pleural angle of 63 degrees.|
|W. Yü and E. L. Yochelson 1999||High spired, trochiform, sinistral in orthostrophic orientation. Outer face slightly convex, sutures distinctly impressed. Surface ornamented with rugae.|