Deroceras tarracense 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Agriolimacidae

Scientific Name: Deroceras tarracense van Regteren Altena, 1969
Taxonomic Source(s): Bank, R.A. and Neubert, E. 2017. MolluscaBase. Checklist of the land and freshwater Gastropoda of Europe. Last update: July 16th, 2017.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2017
Date Assessed: 2016-06-12
Assessor(s): Seddon, M.B., Gómez Moliner, B.J. & Martínez-Ortí, A.
Reviewer(s): Allen, D.J. & Neubert, E.
Contributor(s): Martínez-Ortí, A. & Gómez Moliner, B.J.
The species has a restricted range in Catalonia, northeastern Spain, with about eight locations in the Province of Tarragona (Catalonia, northeastern Spain). Whilst there are localised threats due to drying of the habitats, quarrying and wildfires, the species is also reported to be abundant in Montsant, a protected area. Given the restricted distribution, increased number of locations (since 1994) and present threats to the species, the species is assessed as Near Threatened (B1ab(iii)+2ab(iii)).
Previously published Red List assessments:

Geographic Range [top]

Range Description:The species is known to have a restricted range in Catalonia, northeastern Spain, where it is found in the Province of Tarragona (Castillejo et al. 1995, Castillejo 1998). It occurs in five known sites (Coll d'Albarca, Montsant Mountain Range, Coll d'Alforja, Mola de Colldejou and Fou de Valet - La Riba) as well as a few sites that were overlooked further west of the original range, which extends the number of known sites (Borredá 1996).
Countries occurrence:
Spain (Spain (mainland))
Additional data:
Estimated area of occupancy (AOO) - km2:32Continuing decline in area of occupancy (AOO):Unknown
Estimated extent of occurrence (EOO) - km2:800-1000
Continuing decline in extent of occurrence (EOO):Unknown
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:No population information is available. There are four sites with no data since 1996 (Borredá 1996).  In the review by Castillejo it was considered the species is known from four sites, which have been resurveyed where they found few specimens, however this may be a function of sampling methodology, as earlier night surveys found the species to be more common (B. Gomez-Moliner pers. comm. 2017).
Current Population Trend:Unknown
Additional data:
Continuing decline of mature individuals:Unknown
Extreme fluctuations:NoPopulation severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:The species is found under leaf litter in mountain forests, and often not abundant. The species is best found during night surveys, when it is active, crawling on the substrates. At two sites (Coll D’Albarca and Coll d’Alforja) there has been increased drying of the habitats and hence few specimens were found during more recent surveys (Castillejo in Verdú et al. 2011).
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: There is no known trade in this species.

Threats [top]

Major Threat(s): There are new urban developments and expansion of building work in the area where this species is found. There are quartzite quarries in the Montsant Range Natural Park, with decline in habitats through quarrying, and accumulation of dust alongside the access roads, coating the vegetation, making it difficult for the slugs to feed, however this is considered to be a localised threat, as other areas away from the quarry activity. There is also an increased risk of fire in this Mediterranean zone.

Conservation Actions [top]

Conservation Actions: There are no known conservation actions in place for this species. On the Spanish Red List it was assessed as Vulnerable under criteria B2ac(iv) (Verdú et al. 2006, 2011). Further research is required on the distribution, population trends and threats to this species, as well as confirming the taxonomic relationship with other range restricted species in Spain.

Citation: Seddon, M.B., Gómez Moliner, B.J. & Martínez-Ortí, A. 2017. Deroceras tarracense. The IUCN Red List of Threatened Species 2017: e.T6497A76144307. . Downloaded on 26 April 2018.
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