Amastra lahainana

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

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

Contents

Amastra lahainana 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 mm, its diameter 6 mm.

(Original description) The shell is perforate or closed, ovate-conic, thin but relatively robust, with a matte surface. It features coarse growth striae near the suture, which are weaker elsewhere. The coloration is highly variable, ranging from carob brown, russet, apricot buff, and ochraceous buff to nearly white. Occasionally, the shell exhibits a bipartite color pattern, such as a light upper portion with a dark base or a light base with a dark spire; more rarely, it is dark with a light base. In some cases, a thin, fragmentary outer cuticle may be present, ivory-yellow with zigzag or net-like markings in mummy brown.

The shell contains 5½ whorls. The embryonic whorls are more convex and finely costulate than in Amastra affinis , with the embryonic shell displaying colors such as chestnut brown, pinkish buff, or cream, often marked with oblique corneous streaks on the last half whorl. The aperture closely resembles that of A. affinis, with the outer lip only slightly thickened internally. The columellar fold is strong and prominent. [2]

Distribution

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

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References

  1. ↑ Amastra lahainana Pilsbry & C. M. Cooke, 1914 . 29 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. 43. 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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