Amastra borcherdingi

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Amastra borcherdingi
Amastra borcherdingi 001.jpg
Shell of Amastra borcherdingi (holotype)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Amastra
Species:
A. borcherdingi
Binomial name
Amastra borcherdingi
Hyatt & Pilsbry, 1911
Synonyms

Amastra (Amastra) borcherdingiHyatt & Pilsbry, 1911 alternative representation

Contents

Amastra borcherdingi is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae. [1]

Description

The length of the shell attains 19 mm, its diameter 10.5 mm.

(Original description) The shell contains 6⅓ whorls. The shell is ovate-conic, narrowly perforate or imperforate, and moderately robust. The upper three or four whorls are reddish-brown (rarely pale yellow), transitioning to white with a faint flesh tint on the last two whorls. These are intricately adorned with angular, zigzag, or interrupted dark brown patterns, which become chestnut with darker streaks on the last half-whorl. The cuticle is often absent near the aperture, partially worn away elsewhere, and frequently almost entirely lost in mature specimens.

The embryonic shell has flat whorls with prominent ribs, and the second whorl displays a distinct keel just above the suture. The subsequent whorls are marked by rather fine, irregular growth lines, and the body whorl occasionally exhibits obliquely descending facets or malleations.

The aperture is nearly white inside, with the outer lip slightly thickened, particularly toward the base. The columellar lamella is small and oblique, adding a subtle structural detail to the overall design. [2]

Distribution

This species is endemic to Hawaii and occurs on Molokai Island.

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References

  1. ↑ Amastra borcherdingi Hyatt & Pilsbry, 1911 . 2 December 2024. Retrieved through: World Register of Marine Species .
  2. ↑ Hyatt, A. & Pilsbry, H. A. (1910–1911). Manual of conchology, structural and systematic, with illustrations of the species. Ser. 2, Pulmonata. Vol. 21: Achatinellidae (Amastrinae). Philadelphia: Conchological Department, Academy of Natural Sciences. p. 292. Retrieved 2 December 2024.{{cite book}}: CS1 maint: multiple names: authors list (link)PD-icon.svg This article incorporates text from this source, which is in the public domain .
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