Perrierina insulana is a species of sea snail, a marine gastropod mollusc in the family Cyamiidae. It is endemic to New Zealand, found in the waters surrounding the Chatham Islands and Stewart Island.
Description
In the original description, Powell described the species as follows:
The shells of the species measure in height, in width, and a single valve has a thickness of . It can be distinguished from P. ovata due to its more evenly ovate outline, and because the posterior of P. ovata is more broadly rounded and slightly subangled.
Taxonomy
The species was first described by A. W. B. Powell in 1933. The holotype was collected by Powell himself in February 1933, from shell sand at a depth of off the coast of Owenga Beach in the Chatham Islands, and is held by the Auckland War Memorial Museum. The species is closely aligned with the fossil species P. ovata, and Powell in 1933 believed that P. insulana was a decedent species of P. ovata.
Distribution and habitat
P. insulana is endemic to New Zealand, found in the waters of the Chatham Islands and Stewart Island at depths of between . Previously, the species was thought to be endemic to the Chatham Islands.
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References