Oligoryzomys belongs to the tribe Oryzomyini, and contains about 22 species. Diploid numbers range from 2n = 44 in Oligoryzomys sp. 2 to 2n = 72 in O. utiaritensis and phylogenetic relationships are not well defined. The high morphological convergence leads to misidentification of taxonomic entities and the species are often identified by chromosomal characters. Until now, the genus has been st...

Importation biological control can create new host-natural enemy responses that are different from those behaviours elicited in native ranges of the agent, and/or pest. This possibility was investigated with Argentine stem weevil (Listronotus bonariensis) presence three endoparasitoid species levels affinity to New Zealand pasture. The question posed whether exhibits species-specific or generic...