Amastra kalamaulensis

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Amastra kalamaulensis
Amastra kalamaulensis 001.jpg
Shell of Amastra kalamaulensis (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. kalamaulensis
Binomial name
Amastra kalamaulensis
Pilsbry & C. M. Cooke, 1914
Synonyms

Amastra (Amastra) kalamaulensisPilsbry & C. M. Cooke, 1914 · alternative representation

Contents

Amastra kalamaulensis 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 11.9 mm, its diameter 7 mm.

(Original description) The shell is imperforate or nearly so, ovate-conic, and very thin. It has a glossy light brownish-olive coloration near the aperture. Elsewhere, it is covered by a thin russet cuticle, often marked with darker or blackish streaks on the body whorl. The last half of the shell is frequently entirely black, typically displaying a cream-white band at the periphery that extends a short distance in front of the aperture.

The shell contains 5⅓ whorls. The embryonic whorls are flat, carinate, and costate, with ribs coarser than those of Amastra mucronata . The subsequent whorls are somewhat convex, characterized by irregular growth lines. The acutely angular periphery remains distinct on the penultimate whorl but becomes rounded before reaching the last, where the former position of the keel is usually indicated by a light band on the ventral side.

The aperture is dark inside, lacking any white lining. The columellar fold is thin, and the columellar margin is reflected, nearly or entirely closing the perforation. [2]

Distribution

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

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References

  1. ↑ Amastra kalamaulensis Pilsbry & C. M. Cooke, 1914 . 27 November 2024. Retrieved through: World Register of Marine Species .
  2. ↑ Pilsbry, H. A. & Cooke, C. M. (1914–1916). Manual of conchology, structural and systematic, with illustrations of the species. Ser. 2, Pulmonata. Vol. 23: Appendix to Amastridae, Tornatellinidae, Index to vols. XXI-XXIII. pp. i-xi. Philadelphia: Conchological Department, Academy of Natural Sciences. p. 37. Retrieved 27 November 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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