Hemiarthrum

Hemiarthrum setulosum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Polyplacophora
Order:	Chitonida
Suborder:	Lepidopleurina
Family:	Hanleyidae
Genus:	Hemiarthrum Dall, 1876
Species:	H. setulosum
Binomial name
Hemiarthrum setulosum Dall, 1876
Synonyms
Hemiarthrum setulosum Dall, 1876 Hemiarthrum hamiltonorum Iredale and Hull, 1932 Hemiarthrum setulosum Powell, 1957

Hemiarthrum setulosum is a species of chiton in the family Hanleyidae, the only member of the genus Hemiarthrum.

Distribution

This species is endemic to circum-Antarctic islands, including Macquarie Island.

Shell description

The shell is small, elongate, with valves weakly sculptured, the girdle leathery or spongy, with short hair-like processes scattered all over, and bunches of longer processes at the sutural pores. There are eight processes in front of the head valve and two behind the tail valve.

Length is up to 9 mm, and the width is up to 4 mm.

References

• Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1