Arion simrothi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Arionidae

Scientific Name: Arion simrothi Künkel, 1909
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.
Taxonomic Notes: The distinction between this species and others is unclear and requires confirmation. Welter-Schultes (2012) does not accept this species.

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2017
Date Assessed: 2016-11-29
Assessor(s): Kappes, H.
Reviewer(s): Duda, M., Neiber, M.T., Rowson, B. & Allen, D.J.
The species is apparently known only from the type material collected in the mountains near Gengenbach in the Black Forest, in southwestern Germany. There are divergent opinions on this species. It has been listed as extinct in regional lists, but it may be confused with members of the Arion subfuscus complex and overlooked. The species is considered Data Deficient (DD) as nothing is known about its current distribution and population, and confirmation of its taxonomic identity is required.
Previously published Red List assessments:

Geographic Range [top]

Range Description:The present species was described by Künkel (1916), who in a later publication provided the information that the type was collected from the mountains at Gengenbach (city) in the Black Forest, Baden-Württemberg, southern Germany. It has not been recorded since then and is regionally considered extinct (Arbeitsgruppe Mollusken BW 2008). However, Wiese (2014) claims it could be widespread in old, highly natural forests, but rare and overlooked or mistaken for Arion subfuscus. The author does not have any data himself (V. Wiese pers. comm.). The similar species (complex) Arion subfuscus also favours broadleaved forests and might be confused with the present species, which is larger sized than Arion subfuscus.
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It is unknown. It seems to occur at only one location. The slug has never been found after its description and is classified as "Extinct" in regional lists.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This species was described from a tempered forest in a mountainous region. The similar species (complex) Arion subfuscus also favors broadleaved forests. Information on reproduction and other subjects is only known from laboratory populations from Künkel (1916). Juveniles hatched from eggs ca. in August to September; in November full-grown individuals were obviously old-aged, hence the species is probably annual.

Use and Trade [top]

Use and Trade: The species is not subject to trade.

Threats [top]

Major Threat(s): Wiese (2014, and pers. comm.) speculates the species could be linked to ancient, natural broad-leaved forests in the low mountain ranges of Germany (or west-central Europe). If this is the case, any loss of this rare habitat type would pose a threat, however since the continued presence and distribution of the species is not known, threats cannot be confirmed.

Conservation Actions [top]

Conservation Actions: The species has been regionally assessed as Extinct (Arbeitsgruppe Mollusken BW 2008). Because of the present lack of data, specific conservation actions cannot be named. Research on its taxonomy and distribution is needed, and the distinction between this species and others is unclear and requires confirmation.

Citation: Kappes, H. 2017. Arion simrothi. The IUCN Red List of Threatened Species 2017: e.T2109A85574999. . Downloaded on 21 May 2018.
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