Trinomys yonenagae 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Mammalia Rodentia Echimyidae

Scientific Name: Trinomys yonenagae (Rocha, 1995)
Taxonomic Notes: This species was formerly placed in the genus Proechimys, but see Lara and Patton (2000) for reasons to place this taxon in the genus Trinomys.

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(i,ii,iii) ver 3.1
Year Published: 2016
Date Assessed: 2016-06-10
Assessor(s): Roach, N. & Naylor, L.
Reviewer(s): Amori, G.
Contributor(s): Catzeflis, F., Patton, J.L., Percequillo, A., Bonvicino, C.R., Weksler, M. & Pierro, H.
This species is listed as Endangered because the area of occupancy is probably less than 500 km2, all individuals are in fewer than five locations, and there is continuing decline in the extent and quality of its habitat; sand dune habitat under threat of extraction of sand.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is known from middle Rio São Francisco in northwestern Bahia State, Brazil (Fabre 2016, Pessôa et al. 2015). It is endemic to sand dunes, restricted dune range probably includes most of the continuous main sand dune field on left bank of the middle Sao Francisco River, and probably excludes the smaller northern field (Rocha 1995).
Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:499Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:
Continuing decline in extent of occurrence (EOO):Yes
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There is no information available on the population status of this species.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:This species is restricted to a small area in a semiarid sandy dune habitat characterized by a sparse vegetative covering and subject to the macroclimatic conditions of Caatinga biome (Pessôa et al. 2015). Individuals live in self-dug burrow systems, the majority of which are located in valleys among sand dunes where vegetation is sparse (J. W. Santos and Lacey 2011, Pessôa et al. 2015). Adults of both sexes share burrow systems and in some cases nest sites (Pessôa et al. 2015, J. W. Santos and Lacey 2011). It is group-living, semi-fossorial, and desert dwelling (Santos 2010). Individuals of this species share burrows and are probably social (Santos and Lacey 2011).
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): The major threat to this species is the loss of its habitat to sand extraction (Y. Leite pers. comm.). Due to its habitat it should be the prey of multiple predators (Santos and Lacey 2011).

Conservation Actions [top]

Conservation Actions: This rodent is not included in any protected areas.

Citation: Roach, N. & Naylor, L. 2016. Trinomys yonenagae. The IUCN Red List of Threatened Species 2016: e.T136414A22212204. . Downloaded on 18 September 2018.
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