Belongs within: Rissooidea.
Cingula is a genus of minute marine gastropods with a conical shell found in the North Pacific and North Atlantic (Oldroyd 1927).
Characters (from Oldroyd 1927): Shell minute, white or horny; conical, pointed, many-whorled; smooth or cancellated; aperture rounded; peristome entire, continuous; outer lip slightly expanded and thickened; operculum sub-spiral.
<==Cingula Fleming 1818 [Cingulinae]BR05
|--C. (Cingula)TW76
| |--*C. (C.) cingillus (Montagu 1803)BR17 (see below for synonymy)
| `--C. (C.) mariae (Tenison Woods 1876) [=Rissoa (C.) mariae]TW76
`--C. (Nodulus Monterosato 1878)O27
|--C. (N.) asser Bartsch 1919O27
|--C. (N.) cerinella (Dall 1886) [=Onoba cerinella]O27
|--C. (N.) kelseyi (Bartsch 1919) [=Nodulus kelseyi]O27
|--C. (N.) kyskensis Bartsch 1911O27
`--C. (N.) palmeri Dall 1919O27
Cingula incertae sedis:
C. alaskana Bartsch 1912O27
C. aleutica Dall 1886O27
C. arenaria Mighels & Adams 1842J49
C. californica Tryon 1865O27
C. carinata Mighels & Adams 1842J49
C. interruptaCS77
C. katherinae Bartsch 1912O27
C. latior Mighels & Adams 1842J49
C. martyni Dall 1886 [=C. robusta martyni]O27
|--C. m. martyniO27
`--C. m. scipio Dall 1886 [=C. robusta scipio]O27
C. minutaC64
C. montereyensis Bartsch 1912O27
C. orvieta Dall 1919O27
Nomen nudum: Cingula candida Mighels 1841J49
*Cingula (Cingula) cingillus (Montagu 1803)BR17 [=Turbo cingillusBR17, Rissoa cingillusO27; incl. R. cingillus var. ruprestrisJ79]
*Type species of generic name indicated
References
[BR05] Bouchet, P., & J.-P. Rocroi. 2005. Classification and nomenclator of gastropod families. Malacologia 47 (1–2): 1–397.
[C64] Carpenter, P. P. 1864. Supplementary report on the present state of our knowledge with regard to the Mollusca of the west coast of North America. Report of the British Association for the Advancement of Science 33: 517–686.
[CS77] Cramp, S., & K. E. L. Simmons (eds) 1977. Handbook of the Birds of Europe, the Middle East and North Africa: The Birds of the Western Palaearctic vol. 1. Ostrich to Ducks. Oxford University Press: Oxford.
[J79] Jeffreys, J. G. 1879. Notes on Colonel Montagu’s collection of British shells. Journal of Conchology 2: 1–4.
[J49] Johnson, R. I. 1949. Jesse Wedgwood Mighels with a bibliography and a catalogue of his species. Occasional Papers on Mollusks 1 (14): 213–231.
[O27] Oldroyd, I. S. 1927. The Marine Shells of the West Coast of North America vol. 2 pt 3. Stanford University Press: Stanford University (California).
[TW76] Tenison Woods, J. E. 1876. Description of new Tasmanian shells. Papers and Proceedings of the Royal Society of Tasmania 1875: 134–162.