Diloma subrostratum

Diloma subrostratum, common name the mudflat top shell, is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.^[1]

Diloma subrostratum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Trochidae
Genus:	Diloma
Species:	D. subrostratum
Binomial name
Diloma subrostratum (Gray, 1835)
Synonyms
Chlorostoma undulosum A. Adams, 1853 Diloma (Fractarmilla) subrostrata subrostrata (Gray, J.E. in Yate, 1835) Diloma plumbera Hutton, 1882 Labio corrosa A. Adams, 1853 Labio hectori Hutton, 1873 Monodonta subrostrata Gray, 1835 Trochus attritus Hombron, and Jacquinot, 1854

Description

The length of the adult shell of this species varies between 11 mm and 32 mm. The solid, conical shell is suborbicular. It is often more or less black, with close wavy longitudinal yellow lines. The spire is short with five whorls. The last whorl is large, rounded, with its hinder part with three to six spiral keels. The axis is imperforated. The inside of the aperture is smooth and silvery.^[2]

Distribution

This common estuarine species is endemic to New Zealand, occurring in the North and South Islands, and in Stewart Island.^[3]