First record of <i>Pseudoryzomys simplex</i> (Cricetidae, Sigmodontinae) in a flooded area of the Pantanal, Brazil

Pseudoryzomys simplex is a small to medium sized terrestrial rodent confined to lowland open areas with strong seasonal rainfall throughout the Chaco, Cerrado and Caatinga. Despite its extensive range, the species is difficult to trap. In this report we provide the first record of P. simplex in the Pantanal, where three specimens were collected in a pasture of exotic grass. The specimens are morpometrically similar to the population from Paraguay (Chaco). In this sense, our report shows how interesting a taxonomic review of the species would be to better understand the real significance of the geographic variation herein observed.

Keywords:
false Oryzomys; geographic distribution; Pantanal wetland

Authorship

R. W. Wolf

Laboratório de Virologia e Rickettsioses, Faculdade de Medicina Veterinária, Universidade Federal do Mato Grosso – UFMT, Avenida Fernando Correa da Costa, 2367, CEP 78060-900, Cuiabá, MT, BrazilUniversidade Federal do Mato GrossoBrazilCuiabá, MT, BrazilLaboratório de Virologia e Rickettsioses, Faculdade de Medicina Veterinária, Universidade Federal do Mato Grosso – UFMT, Avenida Fernando Correa da Costa, 2367, CEP 78060-900, Cuiabá, MT, Brazil

Instituto Nacional de Ciência e Tecnologia em Áreas Úmidas – INAU, Rua Dois, 497, Boa Esperança, CEP 78068-360, Cuiabá, MT, BrazilInstituto Nacional de Ciência e Tecnologia em Áreas ÚmidasBrazilCuiabá, MT, BrazilInstituto Nacional de Ciência e Tecnologia em Áreas Úmidas – INAU, Rua Dois, 497, Boa Esperança, CEP 78068-360, Cuiabá, MT, Brazil

R. V. Rossi

Instituto de Biociências – IB, Universidade Federal de Mato Grosso – UFMT, Avenida Fernando Correa da Costa, 2367, CEP 78060-900, Cuiabá, MT, BrazilUniversidade Federal de Mato GrossoBrazilCuiabá, MT, BrazilInstituto de Biociências – IB, Universidade Federal de Mato Grosso – UFMT, Avenida Fernando Correa da Costa, 2367, CEP 78060-900, Cuiabá, MT, Brazil

M. Aragona

Instituto de Engenharia, Universidade Federal de Mato Grosso – UFMT, Campus de Várzea Grande, Avenida Fernando Correa da Costa, 2367, CEP 78060-900, Cuiabá, MT, BrazilUniversidade Federal de Mato GrossoBrazilCuiabá, MT, BrazilInstituto de Engenharia, Universidade Federal de Mato Grosso – UFMT, Campus de Várzea Grande, Avenida Fernando Correa da Costa, 2367, CEP 78060-900, Cuiabá, MT, Brazil

D. M. Aguiar ^**e-mail: danmoura@ufmt.br

*e-mail: danmoura@ufmt.br

SCIMAGO INSTITUTIONS RANKINGS

Figures | Tables

Figures (3)
Tables (1)

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Figure 1
Collecting localities of Pseudoryzomys simplex (solid circles) based on Prado and Percequillo (2013)Prado, J.R. and Percequillo, A.R., 2013. Geographic distribution of the genera of the tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae) in South America: patterns of distribution and diversity. Arquivos de Zoologia, vol. 44, no. 1, pp. 1-120. http://dx.doi.org/10.11606/issn.2176-7793.v44i1p1-120.
http://dx.doi.org/10.11606/issn.2176-779... and the first collecting locality of the species (open square) in the Pantanal (gray area, based on Olson et al., 2001Olson, D.M., Dinerstein, E., Wikramanayake, E.D., Burgess, N.D., Powell, G.V.N., Underwood, E.C., D’Amico, J.A., Itoua, I., Strand, H.E., Morrison, J.C., Loucks, C.J., Allnutt, T.F., Ricketts, T.H., Kura, Y., Lamoreux, J.F., Wettengel, W.W., Hedao, P. and Kassem, K.R., 2001. Terrestrial ecoregions of the world: a new map of life on Earth. Bioscience, vol. 51, no. 11, pp. 933-938. http://dx.doi.org/10.1641/0006-3568(2001)051[0933:TEOTWA]2.0.CO;2.
http://dx.doi.org/10.1641/0006-3568(2001... ).

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Figure 2
Landscape of exotic (Brachiaria humidicula) pasture and sparse native shrubs and termite mounds in the Pantanal where specimens of Pseudoryzomys simplex were collected. The place gets occasionally flooded in the wet season.

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Figure 3
Dorsal and ventral views of the skull of Pseudoryzomys simplex collected in the Pantanal (UFMT 3842). Scale bar, 5 mm.

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Table 1
Sex, measurements (in millimeters) and weight (in grams) of three adult specimens of Pseudoryzomys simplex collected in the Pantanal, precisely in the county of Pirizal, municipality of Poconé, state of Mato Grosso, Brazil.

Figure 1 Collecting localities of Pseudoryzomys simplex (solid circles) based on Prado and Percequillo (2013)Prado, J.R. and Percequillo, A.R., 2013. Geographic distribution of the genera of the tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae) in South America: patterns of distribution and diversity. Arquivos de Zoologia, vol. 44, no. 1, pp. 1-120. http://dx.doi.org/10.11606/issn.2176-7793.v44i1p1-120.
http://dx.doi.org/10.11606/issn.2176-779... and the first collecting locality of the species (open square) in the Pantanal (gray area, based on Olson et al., 2001Olson, D.M., Dinerstein, E., Wikramanayake, E.D., Burgess, N.D., Powell, G.V.N., Underwood, E.C., D’Amico, J.A., Itoua, I., Strand, H.E., Morrison, J.C., Loucks, C.J., Allnutt, T.F., Ricketts, T.H., Kura, Y., Lamoreux, J.F., Wettengel, W.W., Hedao, P. and Kassem, K.R., 2001. Terrestrial ecoregions of the world: a new map of life on Earth. Bioscience, vol. 51, no. 11, pp. 933-938. http://dx.doi.org/10.1641/0006-3568(2001)051[0933:TEOTWA]2.0.CO;2.
http://dx.doi.org/10.1641/0006-3568(2001... ).

Figure 2 Landscape of exotic (Brachiaria humidicula) pasture and sparse native shrubs and termite mounds in the Pantanal where specimens of Pseudoryzomys simplex were collected. The place gets occasionally flooded in the wet season.

Figure 3 Dorsal and ventral views of the skull of Pseudoryzomys simplex collected in the Pantanal (UFMT 3842). Scale bar, 5 mm.

Table 1 Sex, measurements (in millimeters) and weight (in grams) of three adult specimens of Pseudoryzomys simplex collected in the Pantanal, precisely in the county of Pirizal, municipality of Poconé, state of Mato Grosso, Brazil.

	UFMT 3842	UFMT 3843	UFMT 3844	Mean ± SD
Sex	Male	Female	Male
HBL	120	109	110	113.0 ± 6.1
LT	115	111	121	115.7 ± 5.0
Weight	34	30	38	34.0 ± 4.0
CIL	26.33	25.81	25.49	25.88 ± 0.42
LD	7.69	7.48	7.03	7.4 ± 0.34
LM	4.38	4.63	4.66	4.56 ± 0.15
BM1	1.39	1.52	1.47	1.46 ± 0.07
LIF	6.1	5.58	6.05	5.91 ± 0.29
BR	4.18	4.09	4.39	4.22 ± 0.15
BPB	2.67	2.52	2.03	2.41 ± 0.33
BZP	2.69	2.98	2.57	2.75 ± 0.21
LIB	4.31	4.01	4.06	4.13 ± 0.16
BB	12.15	12.26	11.93	12.11 ± 0.17
DI	1.61	1.6	1.36	1.52 ± 0.14
LOF	10.57	10.39	10.36	10.44 ± 0.11

External measurements are: HBL – Head-and-body length; LT – Length of tail; . Craniodental measurements are: CIL – Condylo-incisive length; LD – Length of diastema; LM – Length of molars; BM1 – Breadth of M1; LIF – Length of the incisive foramina; BR – Breadth of the rostrum; BPB – Breadth of the palatal bridge; BZP – Breadth of the zygomatic plate; LIB – east interorbital breadth; BB – Breadth of braincase; DI – Depth of the incisor; LOF – Length of the orbital fossa. For measurements explanation, refer to Voss and Myers (1991)Voss, R.S. and Myers, P., 1991. (Rodentia, Muridae) and the significance of Lund’s collections from the caves of Lagoa Santa, Brazil. Pseudoryzomys simplexBulletin of the American Museum of Natural History, vol. 206, pp. 414-432..

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First record of <i>Pseudoryzomys simplex</i> (Cricetidae, Sigmodontinae) in a flooded area of the Pantanal, Brazil

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[1] *e-mail: danmoura@ufmt.br