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Botelloides bassianus facts for kids

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Botelloides bassianus
Botelloides bassiana 001.jpg
Original drawing of a shell of Botelloides bassianus
Scientific classification
  • Onoba bassiana Hedley, 1911

Botelloides bassianus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

  • Botelloides bassianus bassianus (Hedley, 1911) (synonyms: Rissoa (Onoba) glomerosa Gatliff & Gabriel, 1908; Rissoa (Onoba) bassiana Hedley, 1911)
  • Botelloides bassianus borda Cotton, 1944 (synonym: Botelloides borda Cotton, 1944)


The height of the shell attains 4.5 mm, its diameter 2 mm. The solid, oblong shell has a subcylindrical shape. It is rounded at each extremity.

Colour: the upper part of each whorl is dull white, the lower slate-purple, the anterior extremity is again dull white, the dark band on the median third of the body whorl fading away before reaching the aperture. The apex is brown. The five whorls increase rapidly in size. They are wound obliquely the last two-thirds of the total length.

Sculpture : The earlier whorls are smooth, the later bear fine incised spiral grooves, of which the last has about thirty, the penultimate eighteen, and the antepenultimate twelve. Occasional growth striae cross the shell obliquely. The aperture is pyriform. The columella is excavate. The outer lip is grooved within and bevelled to a sharp edge.

The subspecies Botelloides bassianus borda differs by its cylindrical shell and the sides of the whorls that are rather flattened.


This marine species is endemic to Australia and occurs off New South Wales, South Australia, Tasmania, Victoria and Western Australia

  • Ponder, W.F. 1985. A revision of the genus Botelloides (Mollusca: Gastropoda: Trochacea). Department of Mines and Energy, South Australia, Special Publication 5: 301-327
  • Hickman, C.S. & McLean, J.H. 1990. Systematic revision and suprageneric classification of trochacean gastropods. Natural History Museum of Los Angeles County. Science Series 35: i-vi, 1-169
  • Wilson, B. 1993. Australian Marine Shells. Prosobranch Gastropods. Kallaroo, Western Australia : Odyssey Publishing Vol. 1 408 pp
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