Lodderena formosa

Taxobox
name = "Lodderena formosa"


image_caption =
regnum = Animalia
phylum = Mollusca
classis = Gastropoda
subclassis = Orthogastropoda
superordo = Vetigastropoda
superfamilia = Trochoidea
familia = Cyclostrematidae
genus = "Lodderena"
species = "L. formosa"
binomial = "Lodderena formosa"
binomial_authority = (Powell, 1930)
synonyms =

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

Distribution

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

Habitat

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

hell 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.

References

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