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Leiostyla arborea

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA MOLLUSCA GASTROPODA STYLOMMATOPHORA LAURIIDAE

Scientific Name: Leiostyla arborea
Species Authority: (Lowe, 1855)

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2013
Date Assessed: 2010-09-27
Assessor(s): Seddon, M.B.
Reviewer(s): Cameron, R., Groh, K., Cuttelod, A. & Neubert, E.
Contributor(s): Cameron, R. & Teixeira, D.
Justification:
Seddon (2008) suggested that this species should be considered as Near Threatened (version 3.1), as it is close to meeting the threshold for Endangered (EN) B2ab(iii) (version 3.1). This species is very localised, being present in two main areas on Madeira, representing four locations. The extent of occurrence is under 500 km², however the quality of habitat was not known to have declined in the last 15 years and one of the areas is protected by Natural Park status. Recent changes in 2010 on Madeira may have impacted this species, as there were extensive fires in central Madeira and major storms. As a consequence Cameron (pers. comm. 2010) considered that the species should be assessed as Vulnerable D2, given that the species requires large trees and is rarely found on young trees. He argues that these large trees are more vulnerable to storm damage and fires, and give the recent flood, storms and fires on Madeira, the species should be considered a higher risk. The agreed assessment was Vulnerable D2.

Geographic Range [top]

Range Description: This species is endemic to the Madeiran islands, it is only found on the summit areas of central Madeira on the north side in the laurisilva zone and towards the northcentral coast., where it has an estimated area of occupancy of under 70 km², and at least  six different valleys.
Countries:
Native:
Portugal (Madeira)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There are no recent data on population trend.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This species is found on the trunks of laurisilva trees, in moss and under bark (Seddon 2008).
Systems: Terrestrial

Use and Trade [top]

Use and Trade: The species is not known to be utilised.

Threats [top]

Major Threat(s): Cameron (pers. comm. 2010) notes that that the species requires large trees and is rarely found on young trees. He argues that these large trees are more vulnerable to storm damage and fires, and give the recent flood, storms and fires on Madeira, the species should be considered at higher risk. Any changes to the laurisilva zone which changes the numbers of large trees, such as logging, tourist developments, might impact the species.

Conservation Actions [top]

Conservation Actions: Further survey work are required to determine the impact of the recent forest fires in August 2010 and the major storms in February 2010.

Citation: Seddon, M.B. 2013. Leiostyla arborea. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 22 December 2014.
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