Choristella
Creators
Description
Choristella sp.—new record
Distribution. A single empty, somewhat damaged shell has been dredged on the Agulhas Bank (off Cape St Francis, E. Cape), 210 m.
Notes. The fragile, smooth, globose, white shell, with a deeply channelled suture and distinct umbilical carina indicate that this material is referable to Choristella. The specimen also resembles Trenchia agulhasae (Clarke, 1961) [Seguenzioidea incertae sedis (McLean 1992; Kano et al. 2009)], but that species occurs at abyssal depths and is smaller than the present specimen (diameter 3.0 mm vs. 4.5 mm). It also has a basal carina in addition to the umbilical carina. The poor quality of the specimen does not permit more in-depth evaluation, but I mention it to draw attention to the probable occurrence of Choristella in South African waters. Living specimens are to be sought inside spent egg cases of elasmobranch fish, where they feed on the inner layers of the capsule.
Notes
Files
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Lepetellidae
- Genus
- Choristella
- Kingdom
- Animalia
- Order
- Seguenziida
- Phylum
- Mollusca
- Taxon rank
- genus
References
- Clarke, A. H. (1961) Abyssal mollusks from the South Atlantic Ocean. Bulletin of the Museum of Comparative Zoology, 125, 343 - 387, pls. 1 - 4.
- McLean, J. H. (1992) Systematic review of the family Choristellidae (Archaeogastropoda: Lepetellacea) with description of new species. The Veliger, 34, 273 - 294.
- Kano, Y., Chikyu, E. & Waren, A. (2009) Morphological, ecological and molecular characterization of the enigmatic planispiral snail genus Adeuomphalus (Vetigastropoda: Seguenzioidea). Journal of Molluscan Studies, 75, 397 - 418. http: // dx. doi. org / 10.1093 / mollus / eyp 037