- Source: Allenoconcha retinaculum
Allenoconcha retinaculum is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Microcystidae.
Description
The height of the shell attains 1.5 mm, its diameter 3 mm.
(Original description) The small shell is conically depressed. It is thin, transparent, and slightly glossy with a yellowish-brown hue. It consists of four whorls that increase in size regularly, with the body whorl being subtly angled at the periphery. The shell is sculpted with closely spaced, oblique, arcuate folds, which are more pronounced on the later whorls. The suture is distinctly impressed. The columella margin is curved at the top, descending very obliquely, and thickened inwardly into a whitish, loop-like lamella, visible through the shell. The outer lip is sharp, and the aperture is obliquely compressed and slightly elevated.
Distribution
This species is endemic to Norfolk Island.
References
External links
Köhler, F.; Bouchet, P. (2020). On unavailable genus-group names introduced by Tom Iredale for Australian non-marine gastropods: nomenclatural clarifications and descriptions of new genera. Molluscan Research. 40(2): 150–159
