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Amastra crassilabrum
Conservation status
	; Extinct (IUCN 2.3)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Amastridae
Genus:	Amastra
Species:	†A. crassilabrum
Binomial name
	†Amastra crassilabrum; Newcomb, 1854
	Location of Oʻahu
Synonyms
	Achatinella crassilabrum Newcomb, 1854 superseded combination; Amastra (Metamastra) crassilabrum (Newcomb, 1854) alternative representation;

Amastra crassilabrum is an extict species of air-breathing land snail, a terrestrial pulmonate gastropod mollusks in the family Amastridae. ^[3]

Description

(Original description) The shell is conically ovate, pointed at the apex, and ventricose toward the base, with a rather solid structure. It consists of six rounded whorls and features an ovate aperture. The outer lip is significantly thickened internally, while the short columella terminates in a prominent oblique plait. The surface is marked by strong longitudinal striations, with the body whorl often bearing cicatrices.

The body whorl is yellowish-white, contrasting with the dark brown or black coloration of the upper whorls. ^[4]

Distribution

This species was endemic to Oʻahu, and was known from the Waiʻanae Range.

References

^ Mollusc Specialist Group (1996). "Amastra crassilabrum". IUCN Red List of Threatened Species. 1996: e.T991A13100921. doi:10.2305/IUCN.UK.1996.RLTS.T991A13100921.en. Retrieved 16 November 2021.
^ "WoRMS - World Register of Marine Species - Amastra crassilabrum (Newcomb, 1854)". www.marinespecies.org. Retrieved 2024-11-19.
^ Amastra crassilabrum (Newcomb, 1854). 23 November 2024. Retrieved through: World Register of Marine Species.
^ Newcomb, W. (1854). "Descriptions of seventy·nine new species of Achatinella, (Swains.), a genus of pulmoniferous mollusks, in the collection of Hugh Cuming, Esq". Proceedings of the Zoological Society of London. 21: 142. Retrieved 19 November 2024. This article incorporates text from this source, which is in the public domain.

[iucn_status_16_November_2021-1] Mollusc Specialist Group (1996). "Amastra crassilabrum". IUCN Red List of Threatened Species. 1996: e.T991A13100921. doi:10.2305/IUCN.UK.1996.RLTS.T991A13100921.en. Retrieved 16 November 2021.

[2] "WoRMS - World Register of Marine Species - Amastra crassilabrum (Newcomb, 1854)". www.marinespecies.org. Retrieved 2024-11-19.

[WoRMS-3] Amastra crassilabrum (Newcomb, 1854). 23 November 2024. Retrieved through: World Register of Marine Species.

[4] Newcomb, W. (1854). "Descriptions of seventy·nine new species of Achatinella, (Swains.), a genus of pulmoniferous mollusks, in the collection of Hugh Cuming, Esq". Proceedings of the Zoological Society of London. 21: 142. Retrieved 19 November 2024. This article incorporates text from this source, which is in the public domain.

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