Amastra johnsoni

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

Amastra (Amastra) johnsoniHyatt & Pilsbry, 1911 alternative representation

Contents

Amastra johnsoni 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 11.3 mm, its diameter 6 mm.

(Original description) The shell contains 6½ whorls. The shell is nearly imperforate, oblong-conic, relatively thin, and somewhat glossy. The spire's outlines are straight in the upper portion and slightly convex near the base, with nearly flat whorls.

The whorls of the protoconch are costate, with the second whorl bearing a keel, resembling those of Amastra affinis . The later whorls are adorned with subtle growth wrinkles. The shell is brown, with the body whorl partially covered by a thin, darker cuticle displaying lighter and darker streaks, though lacking oblique or angular markings.

The aperture is whitish inside, with an acute lip that is only minimally thickened internally. The columella is straight, reflexed at the upper end, and bears a small, strongly oblique lamella, adding a refined detail to the overall structure. [2]

Distribution

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

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References

  1. ↑ Amastra johnsoni 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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