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White-spined Atlantic spiny rat
Conservation status
	; Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Echimyidae
Subfamily:	Euryzygomatomyinae
Genus:	Trinomys
Species:	T. albispinus
Binomial name
	Trinomys albispinus; (I. Geoffroy, 1838)
Subspecies
	See text
Synonyms
	Proechimys albispinus

The white-spined Atlantic spiny rat (Trinomys albispinus) is a spiny rat species endemic to Brazil.^[2]

Description

This is one of the smaller spiny rats, with a head-body length of 15 to 21 cm (5.9 to 8.3 in), and a tail 12 to 18 centimetres (4.7 to 7.1 in) long. Adult weight can be anything from 120 to 230 g (4.2 to 8.1 oz). The fur on the upper body and flanks is tawny to buff, interspersed with much paler (although usually not pure white) spines. The underparts, including the lower surface of the tail, are white.^[3]

Females are pregnant between January and June, and give birth to litters of up to four young.^[3]

Distribution and habitat

T. albispinus is found in a relatively small region of eastern Brazil, in the states of Sergipe and Bahia. Compared with other spiny rats, they are adapted for a relatively dry climate, and the region is dominated semi-arid caatinga forest with a mix of deciduous trees and cactuses, among other plants.^[3]

Three subspecies are recognised from different parts of this region: