IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackDysdera diversa Blackwall, 1862

Dysdera diversa Blackwall, 1862

Aranha-tenaz-diversa

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Arachnida
  • Order: Araneae
  • Family: Dysderidae
LC Least Concern
IUCN Red List Status:

Countries of Occurrence:
Portugal - Madeira

Archipelago(s):
Madeira

Assessor/s:
Luis Crespo
Mario Boieiro
Paulo A.V. Borges
Pedro Cardoso
Cardoso, P., Crespo, L.C., Silva, I., Borges, P. & Boieiro, M.

Reviewer/s:
Henriques, S. & Russell, N.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

Dysdera diversa is endemic to the humid, high-altitude Laurisilva forest of Madeira Island (Portugal). This species has a restricted geographic range (the extent of occurence (EOO) and area of occupancy (AOO) both have a maximum estimate of 644 km²). However, it is assessed as Least Concern (LC), since there are no current threats to it and the population seems to be stable throughout its range. More research on the distribution as well as the population trends is needed to confirm the species status.

Geographic Range:

Dysdera diversa is known only from high altitude areas of laurisilva forest (above 800 m) on the island of Madeira (Portugal). A single record is published on the original description without a precise locality (Blackwall 1862). Two more records are recent and to be confirmed and were used on an attempt to model the species distribution (Cardoso et al. 2017).

 

Regions:
Portugal - Madeira
Extent of Occurrence (EOO):
13-644,264 (km2)
Area of Occupancy (AOO):
12-644,264 (km2)
Elevation Lower Limit:
800 (m)
Elevation Upper Limit:
1850 (m)
Biogeographic Realms:
Palearctic
Presence:
Extant
Origin:
Endemic Madeira
Seasonality:
Resident

Population:

No population size estimates exist, but the population is assumed to be stable since the preferred habitat area and quality is stable.

 

Habitat and Ecology

Dysdera diversa is a habitat specialist for the high altitude laurisilva forest of Madeira Island, living on the soil. The diet of D. diversa is unknown, although most congeners are specialized hunters feeding on woodlice.

Major Threat(s):

There are no known threats to this species.

Conservation Actions

No specific conservation measures are in place for this species, but all the species range is inside the Madeira Natural Park. As few localities are known for the species, basic research on species distribution should be made. Monitoring of population trends should be conducted to confirm species status.