Tropidoptera heliciformis

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Tropidoptera heliciformis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Tropidoptera
Species:
T. heliciformis
Binomial name
Tropidoptera heliciformis
Ancey, 1890 [2]
Synonyms

Amastra heliciformisAncey, 1890 superseded combination

Contents

Tropidoptera heliciformis is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae. [3]

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. [4]

Distribution

This species is endemic to Hawaii, occurring on Oahu.

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References

  1. ↑ Cowie, R.H. (1996). "Tropidoptera heliciformis". IUCN Red List of Threatened Species . 1996: e.T22347A9370906. doi: 10.2305/IUCN.UK.1996.RLTS.T22347A9370906.en . Retrieved 16 November 2021.
  2. ↑ "WoRMS - World Register of Marine Species - Tropidoptera heliciformis (Ancey, 1890)". www.marinespecies.org. Retrieved 2024-11-19.
  3. ↑ Tropidoptera heliciformis (Ancey, 1890) . 4 January 2025. Retrieved through: World Register of Marine Species .
  4. ↑ Cooke, C.M. (1917). "Some new species of Amastra". Occasional Papers of the Bernice P. Bishop Museum. 3 (3): 14. Retrieved 2 January 2025.PD-icon.svg This article incorporates text from this source, which is in the public domain .
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