Amastra

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Amastra is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Amastridae.[1]

Like many Hawaiian land snails, species in this genus have adapted to a specific ecological niche and have evolved in relative isolation. They are thriving in wet or moderately wet forested areas.

Many of the species in this genus have become extinct in recent times or have become critically endangered through habitat loss or predation. This loss is often highlighted as part of the broader biodiversity crisis faced by the Hawaiian Islands.

Description

The elongated shell is typically dextral (but some are sinistral), ranging from globose-conic to oblong-conic in shape. It may be umbilicate or imperforate. he shell surface might show growth striations or a fine malleation. The coloration varies, often appearing dull or dark, but sometimes light with a dull, darker, or yellowish cuticle. The shell consists of 5½ to 8 whorls, with the spire and apex conical in shape. The aperture is ovate, and the outer lip is not expanded but is often thickened internally. The columella features a spiral lamella that penetrates about half a whorl, and is present at all stages of growth observed. Above the lamella, the axis is slightly sinuous.

The species is viviparous. The jaw is vertically striate, and the teeth are arranged in nearly straight transverse rows, exhibiting the typical quadrate form. The central teeth are narrow with small, sinuous cusps. [2]

Distribution

This genus is endemic to the Hawaiian Islands.

Species

Species within the genus Amastra include:

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Taxa inquirenda

  • Amastra amboinensis E. A. Smith, 1873
  • Amastra amicta E. A. Smith, 1873
  • Amastra citrea Sykes, 1896: synonym of Amastra mucronata citrea Sykes, 1896 (superseded rank)
  • Amastra lineolata (Newcomb, 1853)
  • Amastra longa Sykes, 1896
  • Amastra peasei E. A. Smith, 1873
  • Amastra seminuda Baldwin, 1906
  • Amastra villosa Sykes, 1896: synonym of Amastra hutchinsonii (Pease, 1862) (junior subjective synonym)

Synonyms

  • Amastra acuta (Swainson, 1828): synonym of Amastra spirizona (Quoy & Gaimard, 1825) (junior subjective synonym)
  • Amastra anaglypta C. M. Cooke, 1917: synonym of Amastra sericea anaglypta C. M. Cooke, 1917 (superseded rank)
  • Amastra bigener Hyatt, 1911: synonym of Amastra affinis (Newcomb, 1854) (junior subjective synonym)
  • Amastra carinata Gulick, 1873: synonym of Amastra agglutinans (Newcomb, 1854) (junior subjective synonym)
  • Amastra citrea Sykes, 1896: synonym of Amastra mucronata citrea Sykes, 1896 (superseded rank)
  • Amastra conicospira E. A. Smith, 1873: synonym of Amastra cylindrica (Newcomb, 1854) (junior subjective synonym)
  • Amastra cookei Hyatt & Pilsbry, 1911: synonym of Amastra textilis (Quoy & Gaimard, 1825) (junior subjective synonym)
  • Amastra deshaysii (Morelet, 1857): synonym of Amastra assimilis (Newcomb, 1854) (junior subjective synonym)
  • Amastra frosti Ancey, 1892: synonym of Amastra micans (L. Pfeiffer, 1859) (junior subjective synonym)
  • Amastra heliciformis Ancey, 1890: synonym of Tropidoptera heliciformis (Ancey, 1890) (superseded combination)
  • Amastra henshawi Baldwin, 1903: synonym of Amastra flavescens henshawi Baldwin, 1903 (superseded rank)
  • Amastra kuhnsi Cooke, 1908: synonym of Laminella kuhnsi (C. M. Cooke, 1908) (original combination)
  • Amastra nigrolabris E. A. Smith, 1873: synonym of Amastra spirizona nigrolabris E. A. Smith, 1873 (superseded rank)
  • Amastra rustica Gulick, 1873: synonym of Amastra affinis (Newcomb, 1854) (junior subjective synonym)
  • Amastra saxicola Baldwin, 1903: synonym of Amastra flavescens saxicola Baldwin, 1903 (superseded combination)
  • Amastra simularis W. D. Hartman, 1888: synonym of Amastra mucronata (Newcomb, 1853) (junior subjective synonym)
  • Amastra villosa Sykes, 1896: synonym of Amastra hutchinsonii (Pease, 1862) (junior subjective synonym

References

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  1. ↑ Template:WRMS species
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  • Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017
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External links

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