Amastra makawaoensis

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Amastra makawaoensis
Amastra makawaoensis 001.jpg
Shell of Amastra makawaoensis (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. makawaoensis
Binomial name
Amastra makawaoensis
Hyatt & Pilsbry, 1911
Synonyms

Amastra (Amastra) makawaoensisHyatt & Pilsbry, 1911 alternative representation

Contents

Amastra makawaoensis 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 20.5 mm, its diameter 10 mm.

(Original description) The shell contains 6½ whorls. The shell is imperforate and oblong-conic, with spire outlines that are straight in the upper portion and gently convex below. The ground color ranges from very pale ochre or cream to reddish-brown near the apex, transitioning to pale yellow below the periphery.

Except near the aperture, the surface is covered by a dense, somewhat glossy cuticle. On the body whorl, the cuticle is black or occasionally features reddish streaks, while the penultimate whorl is heavily streaked with cream or brownish-white. The earlier whorls are reddish-brown, adorned with pale dots or streaks.

The whorls of the protoconch are flattened, with the first being coarsely costate and bearing a carina that is almost concealed at the suture. The second whorl is more finely ribbed. Subsequent whorls exhibit growth wrinkles, and the last two whorls have numerous shallow, unequal spiral striae, which are often faint or obsolete. The body whorl is not highly convex, typically contracted, and frequently features flattened, spirally descending facets or malleation.

The aperture is white and oblique, with an acute outer lip that is somewhat thickened internally. The columellar fold is moderately thickened at the lower end and ascends very obliquely, adding a refined detail to the shell's overall structure. [2]

Distribution

This species is endemic to Hawaii, occurring on Maui Island.

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References

  1. ↑ Amastra makawaoensis Hyatt & Pilsbry, 1911 . 3 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. 319. 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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