IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackAmphorella tuberculata (R.T. Lowe, 1852)

Amphorella tuberculata (R.T. Lowe, 1852)

  • Kingdom: Animalia
  • Phylum: Mollusca
  • Class: Gastropoda
  • Order: Pulmonata
  • Family: Ferussaciidae
VU Vulnerable
IUCN Red List Status:

Countries of Occurrence:
Portugal - Madeira

Archipelago(s):
Madeira

Reviewer/s:
Badia Boher, J.A., Allen, D.J., Backeljau, T. & Fehér, Z.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

This species is endemic to the Madeiran Islands (Portugal), where it was originally recorded in the period from 1970 to 1999 as being present over the eastern part of Porto Santo. The area of occupancy (AOO) is estimated at 12 km2 , whilst the extent of occurrence (EOO), calculated at 1.8 km2 , is revised to 12 km2 to be consistent with the AOO. When found, the species was restricted to the higher elevations of Pico Facho, Pico Castelo, Pico Branco, Pico Gandaia and Pico Juliana. Recent surveys from 2010 to 2015 by D. Teixeira have failed at relocating any specimens in these sites. The conditions were suitable for the survey and the habitats have not changed drastically. Hence it appears that there has been a drastic decline in the population of this species. The present species is assessed as Endangered (EN B1ab(iv,v)+2ab(iv,v)) as it appears likely that there has been a drastic decline in the population and number of sites for this species. Further research is needed to relocate and redefine the distribution of the species.

Geographic Range:

This species is endemic to the Madeiran Islands (Portugal), where it was originally recorded in the period from 1970 to 1999 as being present over the eastern part of Porto Santo, with eight collecting points in an area of 7 km by four 4 km (R. Cameron, K. Groh and M. Seddon pers. comm. 2016). It was restricted to the higher elevations of Pico Facho, Pico Castelo, Pico Branco, Pico Gandaia and Pico Juliana. Recent surveys from 2010 to 2015 by D. Teixeira (pers. comm. 2016) have failed at relocating any specimens in these sites. The AOO is estimated at 12 km2 , whilst the EOO, calculated at 1.8 km2 , is revised to 12 km2 to be consistent with the AOO.

Regions:
Portugal - Madeira
Extent of Occurrence (EOO):
12 (km2)
Area of Occupancy (AOO):
12 (km2)
Elevation Lower Limit:
0 (m)
Elevation Upper Limit:
300 (m)
Biogeographic Realms:
Presence:
Extant
Origin:
Endemic Madeira
Seasonality:
Resident

Population:

Recent surveys from 2010 to 2015 by D. Teixeira (pers. comm. 2016) have failed at relocating any specimens in these sites. The conditions were suitable for the survey and the habitats have not changed drastically. Hence it appears that there has been a drastic decline in the population of this species

Habitat and Ecology

The species was found under stones on grassy areas and on rocky slopes

Major Threat(s):

The main threat to this species may be the change in land use or extensive fires in the region. The island is part of a LIFE Project aimed at managing the fauna.

Conservation Actions

The species is on the main island of Porto Santo, with a LIFE project devoted to work on habitats to survey the land snail species, but without a protected area status. Recent surveys from 2010 to 2015 by D. Teixeira (pers. comm. 2016) in suitable conditions have failed at relocating any specimens in these sites. This suggests that the species has undergone a severe decline in recent years. However, the habitats have not changed drastically in the last decades. There is an urgent need to resurvey these areas to establish whether the species is still present in these habitats. Also, it is important to identify which threats are potentially causing the population decline.