O gênero Holochilus (Mammalia: Cricetidae) no Rio Grande do Sul: taxonomia e distribuição

Abstract

The genus Holochilus Brandt, 1835 (Twigg, 1962(Twigg, e 1965Ozanan, 1969e Massoia, 1981; que ocorreria na porção mais setentrional da América do Sul) e H. chacarius {Vidal et alii, 1976{Vidal et alii, e 1978 Massoia, 1976 (comunicação pessoal e Vidal et alii, 1976

Historia fósil de las ratas palustres de los géneros <i>Holochilus</i> y <i>Lundomys</i> (Cricetidae, Sigmodontinae) en el Cono Sur de América del Sur

“…Geographic locations of collecting localities are presented in the Fig. 1 (Ameghino, in schedis) Sigmodon multannus (Ameghino, in schedis) Recent distribution: From central-eastern Argentina throughout eastern Paraguay and Uruguay to the southeastern states of Brazil, including parts of the states of Minas Gerais and Bahia (Hershkovitz, 1955;Massoia, 1976Massoia, , 1981Marques, 1988;Fig. 1a).…”

“…(sensu Ubilla, 1985:188) Lundomys sp. (sensu Pardiñas & Lezcano, 1995:255;Pardiñas & Deschamps, 1996:375) Recent distribution: Uruguay (González, 2001) and southern Brazil, in the State of Rio Grande do Sul (Marques, 1988;Voss & Carleton, 1993;Fig. 1b Taxonomy: L. molitor was originally described based on fossils from Pleistocene-Holocene cave deposits in Minas Gerais, Brazil.…”

On the presence of Holochilus brasiliensis (Desmarest, 1819) (Rodentia: Cricetidae: Sigmodontinae) in the late Pleistocene of southern Brazil

“…The living representatives of Holochilus have semi-aquatic habits, and today live in diverse geographic areas, that include the Amazon Forest, Caatinga, Cerrado, Pantanal, Atlantic Forest, Chaco, Pampean lowlands and northern Patagonian region (Moojen, 1952;Hershkovitz, 1955;Marques, 1988;Barreto and García-Rangel, 2005;Oliveira and Bonvicino, 2006;Formoso et al, 2010). In the State of Rio Grande do Sul, Holochilus is found today in almost all regions always associated with marshes and water bodies (Marques, 1988). By analogy its presence in the fossil record in South Brazil allows to infer the existence of perennial water bodies during the late Pleistocene in this area.…”

“…The living species include H. sciureus Wagner, 1842, found in Venezuela, Guyana, Colombia, Ecuador, Bolivia, Peru, and northern Brazil;H. chacarius Thomas, 1906 found in Paraguay (Chaco), Brazil (State of Mato Grosso do Sul) and northern Argentina; and H. brasiliensis, distributed through eastern Paraguay, southern, southeastern and some areas of northeastern Brazil, Uruguay and Argentina (Hershkovitz, 1955;Marques, 1988;Eisenberg and Redford, 1989;Barreto and García-Rangel, 2005;Oliveira and Bonvicino, 2006;Weksler et al, 2008;Pardiñas and Teta, 2011). Hershkovitz (1955) recognized several subspecies of H. brasiliensis.…”

Range extension of Lundomys molitor (Winge, 1887) (Mammalia: Rodentia: Cricetidae) to eastern Rio Grande do Sul state, Brazil

“…Lundomys molitor is characterized by a semiaquatic habit, hence being restricted to proximities to freshwater, such as marshes and streams bordered by grass and brush (Marques 1988;Voss & Carleton 1993). Moreover, regardless of its larger distribution in past times during Pleistocene and early Holocene (see Voss & Carleton 1993;Pardinãs & Teta 2011), L. molitor presents a current range distribution restricted to only five localities in Uruguay and a single locality in Brazil.…”