Oligoryzomys Bangs 1900 The genus Oligoryzomys, the most diverse of tribe Oryzomyini, comprises 25 extant species, namely, O. andinus (Osgood 1914), O. arenalis (Thomas 1913), O. brendae (Massoia 1998), O. chacoensis (Myers & Carleton 1981), O. costaricensis (Allen 1893), O. delicatus (Allen & Chapman 1897), O. destructor (Tschudi 1844) (that includes O. d. destructor and O. d. spodiurus (Hershkovitz 1940)), O. flavescens (Waterhouse 1837), O. fornesi (Massoia 1973), O. fulvescens (Saussure 1860), O. griseolus (Osgood 1912), O. longicaudatus (Bennett 1832), O. magellanicus (Bennett 1836), O. mattogrossae (Allen 1916), O. messorius (Thomas 1901), O. microtis (Allen 1916), O. moojeni (Weksler & Bonvicino 2005), O. nigripes (Olfers 1818), O. pachecoi (Hurtado & D’Elía 2018), O. rupestris (Weksler & Bonvicino 2005), O. stramineus (Bonvicino & Weksler 1998), O. utiaritensis (Allen 1916), O. vegetus (Bangs 1902), O. victus (Thomas 1898), and O. yatesi (Palma & Rodríguez-Serrano 2017). The genus was distributed from northern Central America to the southernmost part of South America, inhabiting environments like rain forest (Amazonian and Atlantic Forests), open and dry areas (Cerrado, Caatinga and Restinga) and flooding-prone areas (Pampas and Pantanal) (Prado & Percequillo 2013; Weksler & Bonvicino 2015b; Hurtado & D’Elía 2019a). Due to the high number of recognized species for this genus, we based our cytogenetic review on the last review of the genus performed by Weksler & Bonvicino (2015b). All cytogenetic data available for the genus was presented on Table 9, and the distribution of diploid and fundamental number of karyotyped specimens were presented on Fig. 17, Fig. 18 and Fig. 19.

Published as part of Moreira, Camila Do Nascimento, Ventura, Karen, Percequillo, Alexandre Reis & Yonenaga-Yassuda, Yatiyo, 2020, A review on the cytogenetics of the tribe Oryzomyini (Rodentia: Cricetidae: Sigmodontinae), with the description of new karyotypes, pp. 1-111 in Zootaxa 4876 (1) on page 59, DOI: 10.11646/zootaxa.4876.1.1, http://zenodo.org/record/4423612