Pachnodus velutinus

Taxonomy

Assessment Information

Geographic Range

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	MOLLUSCA	GASTROPODA	STYLOMMATOPHORA	CERASTIDAE

Scientific Name:	Pachnodus velutinus
Species Authority:	(Pfeiffer, 1841)

Assessment Information [top]

Red List Category & Criteria:

Extinct ver 3.1

Year Published:

2009

Assessor/s:

Gerlach, J.

Reviewer/s:

Miller, R.M., Pollock, C.M. & Seddon, M.

Contributor/s:

Justification:
Range contraction in this species has been recorded since 1972, following range expansion by Pachnodus niger which eventually led to hybridization. Hybrids exhibited a selective advantage in being tolerant of dry conditions; P. velutinus required constant humidity levels in excess of 90%. In 1994, no true P. velutinus could be located and since that date its range has been occupied exclusively by P. niger x velutinus hybrids.

History:

2000

–

Extinct

Geographic Range [top]

Range Description:	Endemic to the Seychelles, this extinct snail was found only on Mahé island.
Countries:	Regionally extinct: Seychelles (Seychelles (main island group))
Range Map:	Click here to open the map viewer and explore range.

Habitat and Ecology [top]

Habitat and Ecology:	This snail once inhabited high forests, requiring constant humidity levels in excess of 90%. By the early 1990s, it was restricted to the dampest area of moss forests, and by 1994 it had become extinct.
Systems:	Terrestrial

Threats [top]

Major Threat(s):	Being vulnerable to dessication, this species was historically threatened by habitat degradation and climatic changes. Hybridization with Pachnodus niger led to the extinction of this species in 1994.

Major Threat(s):

Being vulnerable to dessication, this species was historically threatened by habitat degradation and climatic changes. Hybridization with Pachnodus niger led to the extinction of this species in 1994.

Conservation Actions [top]

Conservation Actions:	This snail was historically present in the Morne Seychellois National Park.

Conservation Actions:

This snail was historically present in the Morne Seychellois National Park.

Citation:	Gerlach, J. 2009. Pachnodus velutinus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 23 May 2013.
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