Leptaxis minor 

Scope: Global, Europe & Mediterranean
Language: English

Translate page into:

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Stylommatophora Hygromiidae

Scientific Name: Leptaxis minor Backhuys, 1975
Taxonomic Notes: Morelet (1860) extended the range of L. azorica to Santa Maria as variety γ minor, which Backhuys (1975) elevated to subspecific level. van Riel et al. (2005), using molecular data, found evidence for specific separation of the populations from Santa Maria. Backhuys (1975) states the type locality as “Azores, Santa Maria, Ribeira Almagreira”; however, just after that statement, the author mentions the 2 specimens from Pico Alto as “paratypes”. Ribeiro, Almagreira is at the footsteps of Pico Alto; for that reason, although confusing, this locality imprecision is not worth correcting.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2011
Date Assessed: 2010-11-19
Assessor(s): de Frias Martins, A.M.
Reviewer(s): Neubert, E. & Cuttelod, A.
The area from where L. minor has been recorded is small (extent of occurrence = 97 km2); although there is continuous forest, it is mostly secondary forest used for resources, which is liable to be cut down in the future. On the lower half of Pico Alto cattle affect the forest habitat through grazing and trampling, and may exclude the species from lower altitudes, further restricting its habitat. Therefore it has been assessed as Endangered (EN B1ab(iii)).

Geographic Range [top]

Range Description:This species is found on o the Pico Alto complex on Santa Maria island, Azores.
Countries occurrence:
Portugal (Azores)
Additional data:
Number of Locations:2
Lower elevation limit (metres):300
Upper elevation limit (metres):570
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is restricted to the Pico Alto complex on Santa Maria island, where it is not commonly found; although it is more frequent at higher altitudes.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Leptaxis minor lives on the native vegetation at the top of Pico Alto, as well as in the secondary forests of Cryptomeria, Pittosporum and Accacia that cover most of the mountainous complex.

Use and Trade [top]

Use and Trade: There is no use and trade  information for this species.

Threats [top]

Major Threat(s): Leptaxis minor is relatively uncommon and highly restricted, but it has adapted to secondary forests where there is a thick undergrowth of Hedychium. However the secondary forest is liable to be cut down, and on the lower half of Pico Alto, there is cattle that is let to enter the forest of Pittosporum, thus destroying the habitat by grazing and trampling, excluding L. minor from lower altitudes, further restricting its habitat.

Conservation Actions [top]

Conservation Actions: Pico Alto is a protected area; however careful monitoring to avoid destruction of the habitat should be a priority.

Classifications [top]

1. Forest -> 1.4. Forest - Temperate
suitability:Suitable  major importance:Yes
5. Law & policy -> 5.4. Compliance and enforcement -> 5.4.4. Scale unspecified

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
  Occur in at least one PA:Yes
In-Place Species Management
In-Place Education
2. Agriculture & aquaculture -> 2.3. Livestock farming & ranching -> 2.3.4. Scale Unknown/Unrecorded
♦ timing:Ongoing ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.2. Species disturbance

5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.5. Motivation Unknown/Unrecorded
♦ timing:Future ♦ scope:Unknown ♦ severity:Unknown ⇒ Impact score:Unknown 
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance

3. Monitoring -> 3.4. Habitat trends

Bibliography [top]

Backhuys, W. 1975. Land and Fresh-water Molluscs of the Azores. Backhuys & Meesters, Amsterdam.

IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 30 June 2017).

Morelet, A. 1860. Notice sur l'histoire naturelle des Açores suivie d'une description des mollusques terrestres de cet archipel. Baillière, Paris.

Citation: de Frias Martins, A.M. 2011. Leptaxis minor. In: . The IUCN Red List of Threatened Species 2011: e.T156987A5025738. . Downloaded on 22 September 2018.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please provide us with feedback so that we can correct or extend the information provided