Lodderena formosa

From Wikipedia, the free encyclopedia

Lodderena formosa
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Orthogastropoda
Superorder: Vetigastropoda
Superfamily: Trochoidea
Family: Cyclostrematidae
Genus: Lodderena
Species: L. formosa
Binomial name
Lodderena formosa
(Powell, 1930)

Lodderena formosa is a minute sea snail or micromollusc, a marine gastropod mollusc in the family Cyclostrematidae.

Contents

[edit] Distribution

This species is endemic to the north of the North Island of New Zealand including the Three Kings Islands.

[edit] Habitat

This snail is found at depths of between 18 and 475 m.

[edit] Shell description

The shell is very small, solid, white, broad and depressed, almost discoid, with an accelerated last whorl. The suture is deep, canaliculate, partly overhung by numerous crenulations. Similar crenulations margin the deep, vertical-sided, wide umbilicus. Primary sculpture is of three heavy smooth spiral keels, the upper and lower biangulating the body whorl, and the intermediate one peripheral. Surface sculpture is of dense, very fine spiral lirations, plus two stronger spirals, midway on both the dorsal and ventral surfaces. The aperture is circular, the peristome much thickened internally and heavily variced externally.

The shell height is up to 0.75 mm, and the width is up to 1.4 mm.

[edit] References