Notogibbula bicarinata

Notogibbula bicarinata
Apertural view of a shell of Notogibbula bicarinata
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Vetigastropoda
Superfamily:	Trochoidea
Family:	Trochidae
Subfamily:	Trochinae
Genus:	Notogibbula
Species:	N. bicarinata
Binomial name
Notogibbula bicarinata (A. Adams, 1854)
Synonyms[1]
Trochus coxi auct. Calliotrochus coxi auct. Gibbula bicarinata Adams, 1854 (basionym) Gibbula coxi Angas, 1867

Notogibbula bicarinata, common name "Cox's top shell", is a species of sea snail, a marine gastropod mollusc in the family Trochidae, the top shells.

Distribution

This species inhabits the shallow subtidal zone of sandy bays, among seaweed and seagrass along the coasts of southern Western Australia to New South Wales and Tasmania.

Description

The pink or fawn shell shows dark purple and brown markings with a pattern of zig-zag brown lines. The shell is solid and smooth but not glossy .The height and width of the shell are almost equal, with a maximum width of 1 cm. The white aperture is round and occupies about half the length of the shell. The whorls are keeled and with a strong shoulder and basal angulations. The transition between the shoulder and the sutures is slightly concave. The sculpture of the shell shows microscopic spiral threads. The parietal callus and the curved columella have both a smooth appearance. The white, narrow umbilicus goes deep into the shell. ^{[2] [3]}

A shell of Notogibbula bicarinata, apical view

References

1. ^ OBIS : Notogibbula bicarinata
2. ^ Patty Jansen, The family Trochidae (Mollusca: Gastropoda) in the Sydney metropolitan area and adjacent coast
3. ^ Des Beechey, The Seashells of New South Wales; accessed 23 August 2010