Amastra nigra

Last updated

Amastra nigra
Amastra nigra 001.jpg
Shell of Amastra nigra
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Stylommatophora
Family: Amastridae
Genus: Amastra
Species:
A. nigra
Binomial name
Amastra nigra
(Newcomb, 1855)
Synonyms
  • Achatinella nigraNewcomb, 1855 superseded combination
  • Achatinella nigraL. Pfeiffer, 1856 junior subjective synonym
  • Amastra (Amastra) nigra(Newcomb, 1855) alternative representation

Amastra nigra 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 17 mm, its diameter 11.2 mm

The dextral shell is globosely acuminate, moderately solid, and composed of 6 whorls. The two lower whorls are prominently inflated, contrasting with the subulate superior whorls. The last two whorls display a rugged surface, characterized by coarse longitudinal striae intersected by irregularly spaced, revolving ridges that form rough cicatrices. The upper whorls are flattened and densely marked with pronounced longitudinal striae. The suture is simple, distinct, and well-impressed.

The aperture is roundly ovate, with a short columella ending in a well-defined lamellar tooth. The shell is a yellowish-white hue, coated with a delicate black epidermis.

The second embryonic whorl is nearly flat-sided, featuring a sculpture of strong, curved riblets and a prominent carina above the suture. The following whorl displays fine ribbing, which is partially effaced at its center. The final, highly globose whorl is distinctly malleated, characterized by flattened facets and irregular, descending spiral ridges.

The spire is brown, while the body whorl, beneath its dull, blackish cuticle, is almost white. The cuticle is irregularly adorned with angular streaks on the spire. The outer lip is reinforced by a prominent rib or a delicate callus on the inner surface. [2]

Distribution

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

Related Research Articles

<i>Amastra</i> Genus of gastropods

Amastra is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Amastridae.

Amastra tenuispira is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amastridae.

<i>Amastra umbilicata</i> Species of gastropod

Amastra umbilicata was a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Amastridae.

<i>Amastra albocincta</i> Species of mollusc

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

<i>Amastra eos</i> Species of mollusc

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

<i>Amastra lahainana</i> Species of mollusc

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

<i>Amastra metamorpha</i> Species of mollusc

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

<i>Amastra baldwiniana</i> Species of mollusc

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

<i>Amastra makawaoensis</i> Species of mollusc

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

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

<i>Amastra thaamuni</i> Species of mollusc

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

<i>Amastra vetusta</i> Species of mollusc

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

<i>Amastra nucula</i> Species of mollusc

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

<i>Amastra inflata</i> Species of mollusc

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

<i>Amastra gulickiana</i> Species of mollusc

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

<i>Amastra humilis</i> Species of mollusc

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

<i>Amastra petricola</i> Species of mollusc

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

<i>Amastra pusilla</i> Species of mollusc

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

<i>Amastra kauaiensis</i> Species of mollusc

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

<i>Amastra magna</i> Species of mollusc

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

References

  1. ↑ Amastra nigra (Newcomb, 1855)21 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. 293. 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 .
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.