Thrichomys inermis
Creators: name: Don E. Wilson
name: Thomas E. Lacher, Jr
name: Russell A. Mittermeier
Publisher: name: Lynx Edicions
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Mammalia
Rodentia
Echimyidae
Thrichomys
Thrichomys inermis

description: 25.
Jacobina Punare
Thrichomys inermis
French: Punaré des plateaux / German: Jacobina-Punaré / Spanish: Punaré de Jacobina
Other common names: Highlands Punare, Rabudo
Taxonomy. Echimys inermis Pictet, 1843,
“la Jacobine (dans les montagnes de las Almas, province de Bahia),”Jacobina, Bahia, Brazil.
Swiss zoologist F. J. Pictet in 1843 originally placed this new species in Echimys; E. L. Trouessart in 1880 allocated it to Thrichomys. Samples from Tocantins State in the Northern Caatinga ecoregion, also with chromosome complement of 2n = 26 and FN = 48, belonged to a separate molecular clade that F. F. Nascimento and colleagues in 2013 referred to as 7. aff. inermis and suggested as a distinct, undescribed species. Monotypic.
Distribution. C Brazil, from C Bahia State W to C Tocantins State.
Descriptive notes. Head-body 181-223 mm, tail 111-200 mm; weight 350 g. The Jacobina Punare is the smallest species of Thrichomys. Greatest skull length averages 50-6 mm. Dorsum is ash-gray, tinged with yellow; dorsal tail hairs are blackish brown, and ventral hairs are whitish gray. Distinct cranial characteristics that Jacobina Punare share with Foster’s Punare (7. foster) and the Pantanal Punare (1. pachyurus) include wide incisive foramina with slight lateral constriction at premaxillomaxillary suture and broadened, rectangular hamular processes of pterygoid bones. Features distinguishing the Jacobina Punare from Foster’s Punare and the Pantanal Punare are slender skull, small and not inflated bullae, dorso-ventrally narrow jugals, paroccipital processes appressed to each bulla, and narrow plate (c.0-7 mm) between oval and masticatory foramina. Chromosomal complement is 2n = 26 and FN = 48.
Habitat. Central Caatinga ecoregion at elevations of 260-1030 m. TheJacobina Punare is common in granite or sandstone outcrops, locally called “lajeiros” or “lajedos,” that provide crevices for temporary and secure shelter. Rocky habitats provide cool refuge during heat of day and warmth during cold nights. Nests are placed in crevices or tree cavities and are constructed of cotton, straw, or dry leaves. Individuals have been captured at the mouths of caves.
Food and Feeding. No dietary information from field-caught Jacobina Punares has been reported, but those in the laboratory adjust food intake and relative urine volume while increasing urine osmolality when exposed to water scarcity.
Breeding. Female Jacobina Punares have been recorded with 2-4 embryos in February—March.
Activity patterns. There is no information available for this species.
Movements, Home range and Social organization. There is no information available for this species.
Status and Conservation. Classified as Least Concern on The [UCN Red List. Population trends of the Jacobina Punare are unknown, butit is considered common. It has notable tolerance to landscape modifications throughoutits distribution. It is hunted locally and may be affected byfire.
Bibliography. Bonvicino et al. (2008), Moojen (1952b), Nascimento et al. (2013), Pesséa, Tavares, Neves & da Silva (2015), Pictet (1843), Trouessart (1880, 1904).
description: Published as part of Don E. Wilson, Thomas E. Lacher, Jr & Russell A. Mittermeier, 2016, Echimyidae, pp. 552-604 in Handbook of the Mammals of the World – Volume 6 Lagomorphs and Rodents I, Barcelona :Lynx Edicions on page 565, DOI: 10.5281/zenodo.6623649