Oxychilus basajauna 

Scope: Global & Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Oxychilidae

Scientific Name: Oxychilus basajauna Atlonaga, 1990
Taxonomic Source(s): Bank, R.A. 2017. Fauna Europeae Project: Checklist of the land and freshwater Gastropoda of Europe. Last update: February 18th, 2017. Fauna Europea Project: Hoogezand.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) (Regional assessment) ver 3.1
Year Published: 2017
Date Assessed: 2016-11-01
Assessor(s): Martínez-Ortí, A.
Reviewer(s): Gómez Moliner, B.J. & Allen, D.J.
Facilitator/Compiler(s): Cálix, M.
This species is endemic to northern Spain, where it is only found along the margins of two rivers. It is assessed as Endangered since it has a restricted geographic range (extent of occurrence (EOO) is 170 km2, area of occupancy (AOO) is 24 km2), it occurs at less than five locations and there is a continuing decline in the extent and quality of its habitat due to ongoing urbanization expansion and modification of river margins (construction of concrete walls to prevent flooding). Further research is needed into the population trend of this species. Due to its conservation status and existing threats, this species is in strong need of a conservation plan.

Geographic Range [top]

Range Description:This species is endemic to the Province of Guipúzcua, in the Basque Country, northern Spain, where it occurs in the margins of Urumea River (in River Urumea Valley) and Oria River (Altonaga 1988, 1990, Altonaga et al. 1994, Welter-Schultes 2012). This species is rare along its distribution range, and only six localities are known.
Countries occurrence:
Spain (Spain (mainland))
Additional data:
Estimated area of occupancy (AOO) - km2:24Continuing decline in area of occupancy (AOO):Unknown
Estimated extent of occurrence (EOO) - km2:170
Continuing decline in extent of occurrence (EOO):Unknown
Number of Locations:4
Upper elevation limit (metres):130
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population size and trend are unknown. The Province of Guipúzcoa has not been extensively sampled, and the species may be more common than what is currently known (B. Gómez Moliner pers. comm. 2016).
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This species is found under stones and dead wood, in humid areas with chalky substrates, always near rivers.
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: This species is not utilized.

Threats [top]

Major Threat(s): The main threats to this species are fires and anthropogenic pressure (recreational activities). Other threats are urban expansion, extension of roads, extreme temperatures, droughts and floods. The modification of river margins (construction of concrete walls to prevent flooding) is another threat to this species, as well as the urbanisation of river margins (substitution of natural vegetation by lawns). Due to the existence of these several threats, a continuing decline in the extent and quality of the habitat of the species can be inferred. Taking into account the likely extent of this threat and the distribution of this species, it is considered to occur at less than five locations.

Conservation Actions [top]

Conservation Actions: Further research is needed upon the population size and trend of this species. In addition, this species should be included in any list of fauna protection. A conservation plan is considered to be necessary. Sites along the rivers where the species is known to occur should be protected, and modifications to the river margins prevented.

Citation: Martínez-Ortí, A. 2017. Oxychilus basajauna. The IUCN Red List of Threatened Species 2017: e.T15769A85575635. . Downloaded on 23 September 2018.
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