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The functional morphology of Otina otis, a primitive marine pulmonate

Published online by Cambridge University Press:  11 May 2009

J. E. Morton
J. E. Morton
Affiliation:
Department of Zoology, Queen Mary College, University of London
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Extract

The family Otinidae is the smallest and probably the least known among the pulmonates. Thiele (1931) places it at the base of the Basommatophora, the more primitive order of the subclass Pulmonata, in the Stirps Actophila. It contains a single species, Otina otis Turton, with a geographical range confined to the coasts of the British Isles and north-west France. Its northern distribution reaches as far as the Firth of Clyde, according to Jeffreys (1869), and over the greater part of its British range it appears to follow fairly closely the distribution of the barnacle Chthamalus stellatus, which here reaches its northern limit. Otina otis is a tiny snail, and its external form is limpet-like. The shell, which is well described by Jeffreys (1869), and also by Ellis (1926), measures up to 2*5 mm in length, with a short apical visceral coil at the posterior end. It is dark chestnut brown in colour, and most resembles a minute Haliotis.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 34 , Issue 1 , February 1955 , pp. 113 - 150
Copyright
Copyright © Marine Biological Association of the United Kingdom 1955

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