Cerradomys maracajuensis, Langguth and Bonvicino, 2002

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 : 18-19

Cerradomys maracajuensis

( Langguth and Bonvicino, 2002)

Oryzomys maracajuensis Langguth and Bonvicino, 2002: 292 ; type locality: ‘‘ Brazil, Mato Grosso do Sul :

Municipality of Maracaju (approx. 21 ° 389S, 55 ° 099W) Fazenda da Mata’’.

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

TYPE LOCALITY: ‘‘ Brazil, Mato Grosso do Sul: Municipality of Maracaju (approx. 21 ° 389S, 55 ° 099W) Fazenda da Mata’ ’.

GEOGRAPHIC DISTRIBUTION: The known collection localities of C. maracajuensis (figs. 1, 2) are distributed across the Brazilian Cerrado on Minas Gerais, Mato Grosso do Sul, and Mato Grosso to Paraguayan open areas of Amambay, Caaguazu, Canendiyu, Paraguari, La Cordillera, San Pedro, and Concepcion. To west, C. maracajuensis penetrates the open vegetation lowlands of Bolivia, at Beni, Santa Cruz, and La Paz, and Peru, at Puno. Most records are from lowlands although there are also records of specimens from highlands and dissected highlands of central South America; the known altitudinal range varyies from 102 m (Tacuati, Paraguay; USNM 293154) to 1750 m (Pitiguaya, Bolívia; e.g., AMNH 72641).

DIAGNOSIS: C. maracajuensis is characterized by large body and tail size (HBL range: 140–185 mm; TL range: 171–227 mm; see table 3), long and more robust feet (HF range: 34–43 mm), dorsal body color coarsely grizzled, buffy brown to orange brown, ventral body color grayish to buffy to yellow gray, skull (figs. 4, 6) with shallow rostral fossa, mesopterygoid fossa with small and narrow sphenopalatine vacuities or fully ossified, shallow palatal fossae (simple and large posterolateral palatal pits), developed palatal excrescences, mesolophid developed (narrow and reduced in few individuals from Bolivia), central cartilaginous digit of distal baculum absent, and a unique chromosomal formula (2n 5 56, FN 5 58).

KARYOLOGY: Diploid number of 56 chromosomes and low fundamental number of 58 autosomes are diagnostic for this species when compared with other congeneric species (see Bonvicino et al., 1999; Langguth and Bonvicino, 2002: fig. 3).

NATURAL HISTORY: Available data on museum specimens relating to the natural history of C. maracajuensis report habitat preference: Near the type locality, Maracaju, specimens were collected in some distinct habitats like ‘‘woods’’, ‘‘bush and grass’’, ‘‘Brush pile in

TABLE 3 Descriptive Statistics of External and Skull Measurements for the Three Species of Cerradomys Mean ± standard deviation, (minimum-maximum), N.

grass at edge of rice field’’, ‘‘Brush-Swampy’’, ‘‘Forest’’, and ‘‘Brush and grass’’ (R.M. Gilmore, in museum tags at AMNH and MN), but also in gallery forest ( Langguth and Bonvicino, 2002). In Bolivia, specimens were collected in dense shrub-grass field (cleared forest), dense forest adjacent (G. Schmitt, AMNH tags). Pregnant females were observed in Bolivia during June and September, with two and four embryos ( Anderson, 1997).

SPECIMENS EXAMINED: BOLIVIA: BENI: Boca del Rio Baures : M: AMNH 210227 ; F: AMNH 210025 . Camino Vilches: F: FMNH 116820 . Centenela, Rio Machupo , E San Joaquin: M: FMNH 116835–7 , 116839 , 116841– 2 , 116844 , 116846 ; F: FMNH 116833–4 , 116838 , 116840 , 116845 . Pampa de Meio : F: AMNH 210024 . Puerto Almacen: M: AMNH 255956 , 255979 . Rio Beni , Magdalena: M: FMNH 116823 ; F: FMNH 116908 . Rio Itenez , opposite Costa Marques: M: AMNH 210026–7 . Rio Mamore , circa 10 km W San Pedro: M: AMNH 211801 ; F: AMNH 211802 . Rio Mamore, en la boa del Rio Ibare : M: AMNH 211793 . Rio Mamore , Puerto Caballo: M: AMNH 211794 , 211799 ; F: AMNH 211795–8 . Rio Mamore , W San Javier: M: AMNH 211800 . San Joaquin: M: FMNH 96103 , 116762 , 116773 , 116775–8 , 116810 , 116812 , 116819 , 116848–9 , 116852 , 116855–6 , 116858–9 , 116880 , USNM 364746 , 390673 ; F: FMNH 96109 , 116754–6 , 116760–1 , 116763 , 116767 , 116788 , 116790 , 116832 , 116854 , 116866 , 116875 , 116902 , 116910 . LA PAZ: La Florida (5 Pitiguaya): M: AMNH 72641 , 72717 ; F: AMNH 72642–3 , 72719 , 72780 . Rio Beni : F: AMNH 262077 . SANTA CRUZ: 1 km NE Estancia Las Cuevas : F: AMNH 264196 . 3 km SE Montero: F: AMNH 264194 . 3.5 km W W Estacion Pailon: F: AMNH 260383–4 . 6 km N Buen Retiro: F: AMNH 260378–9 . 6 km W Ascencion: F: AMNH 262076 . 7 km N and 17 km W Buena Vista : F: AMNH 246934 . 12 km S and 8 km E Santa Cruz : F: AMNH 255954 . 15 km S Santa Cruz : F: AMNH 264195 . Ayacucho: M: AMNH 263342 ; F: AMNH 263343 , USNM 391395 . Buena Vista : M: BMNH 26.12.4.42–43, FMNH 51911 ; F: BMNH: 28.2.9.33. Cordillera, Basilio: F: USNM 390678 . El Refugio Pampa, NE from camp: M: USNM 584576 , 584580 ; F: USNM IGP 43–4 , 50–1 , 584578–9 . Estancia Cachuela Esperanza: M: AMNH 260380–1 . Rio Palomitillas, Buena Vista : M: BMNH 28.2.9.36–37. San Miguel Rincon: M: AMNH 260385 , 260388 ; F: AMNH 260386–7 . San Rafael de Amboro : M: AMNH 262073 . Warnes : USNM : F: USNM 390675–6 . BRAZIL: MATO GROSSO: 264 km N Xavantina, Serra do Roncador : M: BMNH 81.450 ; F: BMNH 81.449 . MATO GROSSO DO SUL: Fazenda da Mata , Maracaju: M: MN 44178 (holotype of C. maracajuensis ). Fazenda Primavera, Bataiporã: M: MZUSP 28766 . Maracaju: M: AMNH 134518 , 134705 , 134710 , MN 4409 , 4376 ; F: AMNH 134708 , 134711–2 , MN 4410 ; I: AMNH 134832 , 134854 . MINAS GERAIS: Reserva do Jacob , Nova Ponte: UFMG 1970 . PARAGUAY: AMAMBAY: 28 km SW Pedro Juan Caballero : F: UMMZ 125228 . Parque Nacional Cerro Corá: M: USNM 554541 ; F: USNM 554542–3 . CAAGUAZU: 24 km NNW Carayao : F: UMMZ 133797 . CANENDIYU: 13.3 km N Curuguaty: M: UMMZ 133799–800 ; F: UMMZ 133798 . Villa Igatimi : MLP C 02589 . PARAGUARI: Sapucay: M: BMNH 3.2 . 3.5, 3.4.7.14, 4.1.5.13, 4.1.5.14, 4.1.5.15; F: BMNH 3.4 . 7.15, 3.2.3.9, 4.1.5.16; I: BMNH 3.2 . 3.6. Tacuati, Aca Poi: M: USNM 293154 . SAN PEDRO: Ganadera La Carolina : F: GD 371–3 2. PERU: PUNO: Rio Heath , Aguas Claras Camp: M: USNM 579688 .