Amastra antiqua

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Amastra antiqua
Amastra antiqua 001.jpg
Shell of Amastra antiqua
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Amastra
Species:
A. antiqua
Binomial name
Amastra antiqua
(Baldwin, 1895)
Synonyms
  • Achatinella (Amastra) antiquaBaldwin, 1895 superseded combination
  • Amastra (Cyclamastra) antiqua(Baldwin, 1895) alternative representatio

Amastra antiqua 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 20 mm, its diameter 12 mm.

(Original description) The shell contains 6 whorls. The fossil shell is dextral, narrowly yet deeply perforated, with the perforation extending nearly to the apex. It is solid and elongately ovate, with a subacute apex. The surface is sculptured with coarse, irregular growth lines, while the apical whorls are smooth. The color of the living shell is unknown.

The shell consists of six convex whorls, separated by a well-impressed suture. The aperture is slightly oblique and sublunate. The peristome is thickened on the inner side, with the columellar margin adnate and slightly expanded over the umbilicus. The extremities of the peristome converge and are united by a thick parietal callosity. The columella is flexuous, ending in a narrow plait. [2]

The sculpture consists of coarse, uneven wrinkles separated by finely and irregularly striated intervals. The embryonic shell appears smooth in the fossil specimens. The shell is narrowly umbilicate rather than "perforated", as previously described by Mr. Baldwin, with the umbilicus measuring nearly 1 mm in width.

The spire is slightly contracted near the summit. The peristome is obtuse and features a callous rib on the inner side. A low, oblique nodule or callous ridge is present on the parietal wall, situated some distance within and above, relatively close to the origin of the columella. In adult shells, the parietal callus is notably thickened at the edge. [3]

Distribution

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

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References

  1. ↑ Amastra antiqua(Baldwin, 1895)1 . 5 December 2024. Retrieved through: World Register of Marine Species .
  2. ↑ Baldwind;d (1895). "Descriptions of new species of Achatinellidae from the Hawaiian Islands". Proceedings of the Academy of Natural Sciences of Philadelphia. 47: 233.{{cite journal}}: CS1 maint: multiple names: authors list (link) [[source-attribution}}
  3. ↑ 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. 155. 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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