Bulimulus ochsneri

– Critically Endangered

Taxonomy

Kingdom:	ANIMALIA
Phylum:	MOLLUSCA
Class:	GASTROPODA
Order:	STYLOMMATOPHORA
Family:	ORTHALICIDAE
Scientific Name:	Bulimulus ochsneri
Species Authority:	(Dall, 1917)
Taxonomic Notes:	Synonym = Naesiotus ochsneri.

Assessment Information

Red List Category & Criteria:

CR B2ab(iii) ver 3.1 (2001)

Year Assessed:

2003

Assessor/s:

Parent, C.

Evaluator/s:

Coppois, G. & Seddon, M.B. (Mollusc Red List Authority)

Justification:

Bulimulus ochsneri is endemic to Santa Cruz Island in the Galápagos Islands. It is known from one population with a rang of less than 10 km². The range of suitable habitat for land snails on Santa Cruz Island has declined because of human activities (farming, road and house construction, etc.) and because of destruction or alteration by introduced species.

History:

1990	-	Endangered (IUCN 1990)
1994	-	Endangered (Groombridge 1994)
1996	-	Vulnerable (Baillie and Groombridge 1996)

Geographic Range

Range Description:	Bulimulus ochsneri is endemic to the Galápagos Island of Santa Cruz (986 km²). It is known from one population with a range less than 10 km².
Countries:	Native: Ecuador (Galápagos)

Population

Population Trend:

Habitat and Ecology

Habitat and Ecology:

Arid to transition zones. Found under rocks or on tree trunks (mostly Zanthoxylum fagara and Bursera graveolens).

System:

Terrestrial

List of Habitats:

3.5	Shrubland - Subtropical/Tropical Dry
4.5	Grassland - Subtropical/Tropical Dry

Threats

Threats:

Habitat alteration and/or destruction by human activities (mostly farming) and introduced species. The invasive little fire ant, Wasmannia auropunctata, occurs on the island (Roque and Causton 1999).

List of Threats:

1.1	Habitat Loss/Degradation - Agriculture (ongoing)
1.4	Habitat Loss/Degradation - Infrastructure development (ongoing)
1.5	Habitat Loss/Degradation - Invasive alien species (ongoing)
2.2	Invasive alien species (directly affecting the species) - Predators (ongoing)

Bibliography

Bibliography:

Baillie, J. and Groombridge, B. (compilers and editors) 1996. 1996 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland.

Dall, W.H. 1917. Preliminary descriptions of new species of Pulmonata of the Galapagos Islands. Proceedings of the California Academy of Sciences. Vol. II (11): 375-382.

Dall, W.H. and Ochsner, W.H. 1928. Landshells of the Galapagos Islands. Proceedings of the California Academy of Sciences, 4th Series. 17(5): 141-185.

Groombridge, B. (ed.) 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland.

IUCN. 1990. 1990 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.

IUCN. 2003. 2003 IUCN Red List of Threatened Species. www.iucnredlist.org. Downloaded on 18 November 2003.

Roque, L. and C. Causton. 1999. El Niño and introduced insects in the Galapagos Islands: Different dispersal strategies, similar effects. Noticias de Galápagos 60: 30-36.

Citation:	Parent, C. 2003. Bulimulus ochsneri. In: IUCN 2007. 2007 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 07 August 2008.
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