Amastra transversalis

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Amastra transversalis
Amastra transversalis 001.jpg
Shell of Amastra transversalis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Amastra
Species:
A. transversalis
Binomial name
Amastra transversalis
(L. Pfeiffer, 1856)
Synonyms
  • Achatinella (Laminella) transversalisL. Pfeiffer, 1856 alternative representation
  • Amastra (Amastra) transversalis(L. Pfeiffer, 1856) alternative representation

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

Contents

Subspecies

Description

The length of the shell attains 12 mm, its diameter 6 mm

The shell is subrimate, ovate-conic, and solid, with closely spaced striations that are faintly decussated by distant, spiral, impressed lines. Its coloration is blackish-red, covered by a tawny-gray epidermis that is interrupted by spots and bands, adding a pattern of visual interest.

The spire is inflated-conic and terminates in an acute apex. The shell consists of 6 whorls, which are slightly convex, with the body whorl making up about two-fifths of the total shell length.

The aperture is slightly oblique and sinuate-oval. The columellar fold is lamelliform, subbasal, and nearly transverse. The peristome is unexpanded, whitish on the interior or delicately edged with a rose tint, enhancing the shell's elegance.

The embryonic whorls are dark red-brown, densely and finely striated vertically. After the first whorl, these striations are crossed by very fine spiral lines, giving a delicate decussate pattern. The body whorl is marked by irregular vertical striae, intersected by incised spiral lines. These spirals vary greatly, ranging from deep, strong, and numerous to faint and sparse, with some shells displaying only trace vestiges that are difficult to discern.

The shell's ground color is a rich dark red-brown, partially obscured by intricate whitish tracery that forms a wonderfully varied pattern. On rare occasions, the ground color is a much lighter shade of brown, causing the creamy markings to appear faint. The interior is typically dark flesh-colored, featuring a wide, moderately thick border along the inner lip. The shell's axis is either rimate or imperforate. [2]

Distribution

This species is endemic to Hawaii, occurring on Oahu island.

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References

  1. ↑ Amastra transversalis(L. Pfeiffer, 1856) . 17 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. 183. Retrieved 3 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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