Oligoryzomys

Oligoryzomys

Oligoryzomys, commonly known as the "colilargo" or "long-tailed mouse"

Oligoryzomys is a genus of rodents in the family Cricetidae, commonly referred to as "colilargos" or "long-tailed mice." These small mammals are primarily found in South America, inhabiting a range of environments from tropical forests to grasslands.

Taxonomy

The genus Oligoryzomys is part of the subfamily Sigmodontinae, which includes a diverse group of rodents native to the Neotropics. The genus was first described in the early 20th century and has since been the subject of numerous taxonomic revisions. Species within this genus are often distinguished by their morphological characteristics, such as the length of their tails and the structure of their molars.

Distribution and Habitat

Oligoryzomys species are distributed across a wide range of habitats in South America, from the Andes mountains to the lowland Amazon rainforest. They are adaptable rodents, capable of living in both forested and open areas. Their presence has been recorded in countries such as Argentina, Brazil, Chile, and Peru.

Physical Characteristics

Close-up of Oligoryzomys showing its distinctive long tail

Members of the genus Oligoryzomys are small rodents, typically weighing between 20 to 40 grams. They have a distinctive long tail, which often exceeds the length of their body. Their fur is generally soft and varies in color from grayish-brown to reddish-brown, depending on the species and their environment.

Behavior and Ecology

Oligoryzomys are primarily nocturnal and are known for their agility and climbing abilities. They are omnivorous, feeding on a diet that includes seeds, fruits, insects, and other small invertebrates. These rodents play a significant role in their ecosystems as seed dispersers and as prey for a variety of predators.

Reproduction

The reproductive habits of Oligoryzomys vary among species, but they generally have a high reproductive rate. Females can produce several litters per year, with each litter consisting of 2 to 6 young. The gestation period is relatively short, and the young are weaned quickly, allowing for rapid population growth under favorable conditions.

Related Pages

• Cricetidae
• Sigmodontinae
• Rodent
• Neotropics