Antisolarium egenum is a small sea snail, a marine gastropod mollusc in the family Trochidae, the top shells.

Distribution

This species is endemic to New Zealand.

Habitat

This top shell is found on fine sandy bottoms, from shallow water to depths of about 185 m.

Shell description

The shell is depressed-conical, with a wide, deep umbilicus. Sculpture is of three or four sharp elevated spiral ridges on the dorsal surface, the uppermost two beaded. The base is plain, except for two spirals bordering the umbilicus, the innermost being crenulated.

Shell coloration is greenish iridescent, with numerous red-brown radial streaks, subobsolete on the base.

The shell height is up to 5.5 mm, and the width is up to 7.5 mm.

References

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