Cerradomys marinhus ( Bonvicino, 2003 )

Percequillo, Alexandre R., Hingst-Zaher, Erika & Bonvicino, Cibele R., 2008, Systematic Review of Genus Cerradomys Weksler, Percequillo and Voss, 2006 (Rodentia: Cricetidae: Sigmodontinae: Oryzomyini), with Description of Two New Species from Eastern Brazil, American Museum Novitates 2008 (3622), pp. 1-48 : 20-21

Cerradomys marinhus ( Bonvicino, 2003)

Oryzomys marinhus Bonvicino, 2003: 84 ; type locality: ‘‘ Fazenda Sertão do Formoso (known before as Fazenda Jucurutu, 14 ° 409200S 45 ° 499710 [sic]W, altitude around 775 m), Jaborandi municipality, state of Goiás, Brazil’ ’.

[ Cerradomys ] marinhus: Weksler et al., 2006: 8 .

TYPE LOCALITY: ‘‘ Fazenda Sertão do Formoso (known before as Fazenda Jucurutu, 14 ° 409200S 45 ° 499710[sic]W, altitude around 775 m), Jaborandi municipality, state of Goiás, Brazil’ ’. However , Bonvicino (2003: 79) previously reported that Fazenda Sertão do Formoso was ‘‘located in Jaborandi and Cocos municipalities, Bahia state’’ (see also IBGE, 1972, for the location of these municipalities). Moreover , the geographical coordinates originally presented by Bonvicino did not refer to the collecting locality of the type series. More precisely, all these specimens were captured in

2 These specimens were employed by D’Elía et al. (submitted) as vouchers for the first record of C. maracajuensis for Paraguay.

one specific habitat type, ‘‘veredas’’, whose geographical coordinates were also furnished by the author ( Bonvicino, 2003: 79). Thus, the correct type locality for this species is herein corrected and restricted to: Fazenda Sertão do Formoso , (formerly known as Fazenda Jucurutu, 14 ° 489S, 45 ° 579W, altitude around 775 m), Jaborandi municipality, state of Bahia, Brazil .

GEOGRAPHIC DISTRIBUTION: Besides the type locality, C. marinhus is known from one collection locality in northwestern Minas Gerais state (figs. 1, 2).

DIAGNOSIS: C. marinhus is characterized by large body and tail size (HBL range, 153– 179 mm; TL range, 198–212 mm; table 3), long and robust feet (HF range, 38–43 mm), dorsal body color coarsely grizzled, buffy brown to orange brown, ventral body color grayish to buffy to yellowish gray, skull with shallow rostral fossa (figs. 4, 6), mesopterygoid fossa with small and narrow sphenopalatine vacuities or fully ossified, shallow palatal fossae (simple and large posterolateral palatal pits), m3 with reduced or absent mesolophid, and a unique chromosomal formula (2n 5 56, FN 5 54).

KARYOLOGY: The karyotype of C. marinhus presents 2n 5 56 and FN 5 54; the autosomal complement comprises 27 acrocentric pairs, from large to small. Sexual chromosomes differ in size, with the X chromosome being a large acrocentric and the Y a small-size acrocentric ( Bonvicino et al., 1999; Bonvicino, 2003).

NATURAL HISTORY: Specimens of O. marinhus from Fazenda Sertão do Formoso were captured in a particular Cerrado habitat, called ‘‘vereda’’. ‘‘Vereda’’ is a periodically flooded grassland habitat with scattered palm species of genera Mauritia and Mauritiella , generally in Cerrado stream headwaters (see detailed decription in Bonvicino, 2003: 79, 87). Specimens from Parque Nacional Grande Sertão Veredas were captured at seasonally flooded semideciduous forests (A.P. Carmignotto field notes).

Reproductive data suggested that females breed throughout the year because pregnant females were captured both in dry and rainy seasons, with embryo numbers ranging from 2–4, and with a modal number of 4 embryos

( Bonvicino, 2003: 87). Cerradomys marinhus is infested by ectopasites like mites and ticks of the order Mesostigmata (family Ixodidae ); fleas Polygenis [ Polygenis ] tripus; and flies of the family Hippoboscidae ( Bonvicino, 2003: 88) .

SPECIMENS EXAMINED: BRAZIL: BAHIA: Fazenda Sertão do Formoso, Jaborandi : M: MN 63822–3 , 63830 (holotype of C. marinhus ), 63834; F: MN 63831 , 63837 . MINAS GERAIS: Parque Nacional Grande Sertão Veredas : M: MZUSP APC 764 ; F: MZUSP APC 742 .