Ischnochiton oniscus

Ischnochiton oniscus, the dwarf chiton, is a small polyplacophoran mollusc in the family Ischnochitonidae,[1] endemic to the coast of southern Africa.

Ischnochiton oniscus
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Polyplacophora
Order:
Chitonida
Family:
Ischnochitonidae
Genus:
Ischnochiton
Species:
I. oniscus
Binomial name
Ischnochiton oniscus
(Krauss, 1847)
Synonyms
  • Chiton oniscus Krauss, 1848
  • Ischnochiton eucosmia Turton, 1932 (invalid)

Description

This is the smallest chiton species in southern Africa, reaching an average length of no more than 10 mm. It displays a wide variety of colours and patterns, but is most often white. The valves bear fine pits which are often arranged in rows; radiating ridges are absent. The tiny scales covering the narrow girdle appear smooth to the naked eye but show minute ridges under the microscope.[2]

Distribution and habitat

I. oniscus occurs along the coasts of southern Africa, from Saint Helena Bay on the west coast of South Africa to Maputo Bay in southern Mozambique. Small groups can be found on the underside of rocks in sandy pools.[2]

References
  1. B. Marshall (2015). "Ischnochiton oniscus". WoRMS. World Register of Marine Species. Retrieved 27 December 2016.
  2. Branch, G. M.; Griffiths, C. L.; Branch, M. L.; Beckley, L. E. (2010). Two Oceans: a Guide to the Marine Life of Southern Africa. Cape Town: Struik Nature.
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