Biology:Exomilopsis
Exomilopsis is a genus of minute gastropod molluscs belonging to the family Columbellidae.[1] Both species are found in Oceania.
Description
In the original description, Powell described the genus as below:
The new genus Exomulopsis is characterised by its strong superficial resemblance to the Turrid genus Exomilus, i.e. attenuate spire, sagged, low keeled whorls, crossed by axial folds, and a narrow rectangular aperture, but without an anal sinus. The genus Retizafra, to which spica and its allies have most in common, has a fewer whorled more broadly conic protoconch and the shell is of more conventional fusiform shape, the sculpture being axial reticulated by spiral cords.[2]
The genus' tall, conical protoconchs are more similar to barrow forms of columbellids.[3]
Taxonomy
The genus was first described by A. W. B. Powell in 1964, who named Mangelia spica as the type species, and also described a new species in the genus, E. hipkinsi.[2] Boyer et al. (2022) suspect that the genus is likely a synonym of Gatliffena.[4]
Distribution
Exomilopsis is found in the temperate waters of south of Australia and around New Zealand,[2] and is found in Miocene fossils in Victoria, Australia.[3]
Species
Species within the genus Exomilopsis include:[1]
- Exomilopsis hipkinsi A. W. B. Powell, 1964
- Exomilopsis spica (Hedley, 1907)
References
- ↑ 1.0 1.1 Exomilopsis A. W. B. Powell, 1964. Retrieved through: World Register of Marine Species on 2 October 2025.
- ↑ 2.0 2.1 2.2 , Wikidata Q58676792
- ↑ 3.0 3.1 Powell, A.W.B. (1979). New Zealand Mollusca: Marine, Land and Freshwater Shells. Auckland: Collins. p. 190-191. ISBN 0002169061.
- ↑ Boyer, Franck; Pelorce, Jacques; Gori, Sandro (2022). "Révision des Columbellidae de l'île de Masirah, Oman. Partie 1 : genres Smithena gen. nov., Anachis H. Adams & A. Adams, 1853, Zafra A. Adams, 1860 et Parvanachis Radwin, 1968." (in French). Novapex 23 (3): 87-110. https://www.researchgate.net/publication/364317220.
Further reading
- Wilson, Barry (1994). Australian Marine Shells, Vol. 2. (Neogastropods). Kallaroo, Western Australia: Odyssey Publishing. ISBN 9780646152271.
Wikidata ☰ Q18582390 entry
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