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Theba impugnata 

Scope: Europe
Language: English
Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_onStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Helicidae

Scientific Name: Theba impugnata (Mousson, 1857)
Taxonomic Notes: Theba impugnata was previously named Helix impugnata.

Assessment Information [top]

Red List Category & Criteria: Vulnerable B1ab(iii) (Regional assessment) ver 3.1
Year Published: 2011
Date Assessed: 2011-03-29
Assessor(s): Groh, K. & Neubert, E.
Reviewer(s): Neubert, E., Cuttelod, A. & Bilz, M.
Justification:
There are only a few locations known for this species in the north-west of the Island of Lanzarote. There are some threats to this species, and very obviously, living specimens are rare. It thus can be concluded that the population size is small, and non-regulated recreation activities may impact this susceptible species seriously. Therefore, it is assessed as Vulnerable (VU) B1ab(iii).

Geographic Range [top]

Range Description:This species is endemic to Lanzarote on the Canary Islands. The species is restricted to the northeastern part of Lanzarote and the adjacent islet of Graciosa. Specimens have been observed at Isla Graciosa and in Lanzarote: El Risco, Orzola, Malpais de la Corona, Cueva de los Verdes, Jameos de Agua, HarĂ­a los Valles, Teneguime, Playa de Famara, Montana Corona, Montana de las Nuevas (Gittenberger and Ripken 1987).
Countries occurrence:
Native:
Spain (Canary Is.)
Additional data:
Number of Locations:10
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There is no information available on the population size or trend of this species. Field observation show that the species is rare and hard to find alive.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:There are no specific habitat type in the literature, however, it is nearly always sympatric with T. geminata. (Shells of T. geminata occur in great abundance locally on the islet Graciosa. T. geminata and T. impugnata are sympatric on northern Lanzarote and on Graciosa. Where the two species are found together they are about equally common). This species probably lives in the dry temperate shrub vegetation (Piso basal).
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: This species is not used.

Threats [top]

Major Threat(s): There are some threats to this species by goat grazing and tourist activities. The Riscos are a well known recreation spot with barbecue sites, miradors, and similar infrastructure.

Conservation Actions [top]

Conservation Actions: There is no conservation action in place for this species.

Citation: Groh, K. & Neubert, E. 2011. Theba impugnata. The IUCN Red List of Threatened Species 2011: e.T157120A5040107. . Downloaded on 23 September 2017.
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