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Tropidoptera heliciformis

Species of gastropod

Species of gastropod

Tropidoptera heliciformis is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae.

Description

The length of the shell attains 6 mm, its diameter 10 mm.

(Original description in Latin) The shell is heliciform, depressed, and broadly umbilicate, with the umbilicus open, deep, angular at the margin, and approximately 2 mm in width. The surface is matte, brown, and marked with coarse striations, giving it a somewhat solid appearance.

The spire is depressed and broadly conical with a somewhat obtuse apex. It consists of 5 slightly convex whorls that increase regularly in size and are separated by an impressed suture. The body whorl is carinate, sloping convexly above, fully convex below, and gradually descending over a distance in front.

The aperture is oblique, irregularly circular, and furnished with a sharp, revolving, simple columellar fold. It is emarginate and angular externally, rounding at the base. The margins of the aperture are remote, with the columellar margin straight-sloping and forming an angle with the basal margin.

Distribution

This species is endemic to Hawaii, occurring on Oahu.

References

References

  1. Cowie, R.H.. (1996). "''Tropidoptera heliciformis''".
  2. "WoRMS - World Register of Marine Species - Tropidoptera heliciformis (Ancey, 1890)".
  3. {{WRMS species. 1722849. ''Tropidoptera heliciformis'' (Ancey, 1890). 4 January 2025
  4. (1917). "Some new species of Amastra.". Occasional Papers of the Bernice P. Bishop Museum.
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