IUCN SSC Mid-Atlantic Island Invertebrates Specialist Group

Species

BackScheloribates evanescens Wallwork, 1977

Scheloribates evanescens Wallwork, 1977

Fading Beetle Mite (English)

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Arachnida
  • Order: Acari: Oribatida
  • Family: Scheloribatidae
EN Endangered
IUCN Red List Status:

Countries of Occurrence:
Saint Helena - British Overseas Territory

Archipelago(s):
St. Helena

Assessor/s:
Pryce, D. & White, L.

Reviewer/s:
Gerlach, J.

Contributor/s:

Facilitators / Compilers/s:


Assessment Rationale:

This species was described from eight specimens collected at two sites in the highest parts of the central ridge of the island in 1967 (Wallwork 1978); there was no indication of the precise habitat. No survey work for this group has been undertaken since this time so there is no information on its continued presence. Based on these records, it has an extent of occurrence (EOO) and area of occupancy (AOO) both of 8 km², and is known from two locations. Therefore, it is assessed as Endangered

Geographic Range:

Endemic to the island of St Helena, in the South Atlantic Ocean, where it is confined to the highest parts of the central ridge (Wallwork 1978)

Regions:
Saint Helena - British Overseas Territory
Extent of Occurrence (EOO):
8 (km2)
Area of Occupancy (AOO):
8 (km2)
Elevation Lower Limit:
762 (m)
Elevation Upper Limit:
762 (m)
Biogeographic Realms:
South Atlantic Ocean
Presence:
Extant
Origin:
Endemic St. Helena
Seasonality:
Resident

Population:

This species was described from a total of eight specimens, seven from the Cabbage Tree Road and one from High Peak. No recent surveys have been conducted to establish current population size

Habitat and Ecology

The species is confined to the higher elevations on the island where it probably inhabits soil leaf litter, humus or rotting wood (Wallwork 1978)

Major Threat(s):

Habitat quality decline due to the spread of invasive non-native plant species (e.g. Phormium tenax J.R. Forst. & G. Forst.) and an increase in non-native predators (e.g. Formicidae) that will also be competing for resources threaten this species

Conservation Actions

This is a poorly known taxon; any further research and monitoring would be of value. Of critical importance is the continued expansion and linking of habitat fragments as well as removal of invasive non-native species where this is possible