Diloma bicanaliculata bicanaliculata

Taxobox
name = "Diloma bicanaliculata bicanaliculata"
regnum = Animalia
phylum = Mollusca
classis = Gastropoda
subclassis = Prosobranchia
ordo = Archaeogastropoda
superfamilia = Trochacea
familia = Trochidae
genus = "Diloma"
species = "D. bicanaliculata"
subspecies = "D. bicanaliculata bicanaliculata"
trinomial = "Diloma bicanaliculata bicanaliculata"
trinomial_authority = (Dunker, 1844)

"Diloma bicanaliculata bicanaliculata", or the knobbed top shell, is a subspecies of small sea snail, a marine gastropod mollusk, in the family Trochidae, the top snails.

Distribution

This species is endemic to the North Island of New Zealand.

hell description

The shell is rather small, depressed conic, very solid, dull black but with dark olive interspaces between the heavy nodose cords. The columella and aperture are heavily callused and silvery.

The maximum shell height is 17 mm, and the maximum width 19 mm.

References

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