Sinuites is an extinct genus of epifaunal detritivores
Identification in Hand Sample:
- Lobelike lateral lips.
- Tightly coiled shell.
- Slit band absent.
- Revolving striae as well as growth lines.
- Lack of abruptly expanded aperture.
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- Shell tightly coiled
Treatise on Invertebrate Paleontology, Part I, Mollusca 1 (1960):
- Lateral lips lobelike, close to sides; bases of columellar lips surrounded by a delicate inductura.
- This genus includes those forms which have commonly gone under the name of Protowarthia, a synonym. It is distinguished from Bellerophon in the absence of the slit band, in the lack of abruptly expanded aperture, and presence of revolving striae as well as growth lines.
- In Sinuites a part of the ornamentation is developed on an inductural layer extending outside of the aperture very much as in Euphemites Warthin, (1930).
- Diagnosis: Shell tightly coiled, convolute, umbilicus closed or very small; dorsum generally rounded, flattened somewhat in some cases, with dorsomedian ridge in very few; aperture large, generally longer than wide, with deep, rounded, median sinus and lateral margins projecting downward as rounded or subangular lobes; parietal deposits thin, ornamented in many cases; growth lines fine, closely spaced, in many cases intersected by faint revolving lines.
- Discussion: Species of Sinuites described prior 1896-97 were generally assigned to Bellerophon. Koken (1896, p 392) erected the new genus Sinuites to contain European Ordovician species. Unaware of this new genus, Ulrich and Scofield (1897, p 848) proposed the genus Protowarthia for American species. Bassler (1915, p 1159) recognized the synonymy and the priority of Sinuites Koken and formally designated Bellerophon bilobatus Sowerby the type species of Sinuites .