Thylamyini

• Cryptonanus
• Gracilinanus
• Marmosops
• Thylamys
• Chacodelphys
• Lestodelphys
• Agile Gracile Opossum Gracilinanus agilis

  The agile gracile opossum is a small marsupial with long digits and a grasping tail. It forages both in trees and on the ground.

• Brazilian Gracile Opossum Gracilinanus microtarsus

  The Brazilian gracile opossum is a small marsupial from forests and savanna in southeastern Brazil. It uses branches and vines but also searches for food on the ground.

• Emilia's Gracile Opossum Gracilinanus emiliae

  Emilia's Gracile Opossum is a small marsupial with reddish-brown fur above and white fur below. It is arboreal and may also forage on the ground.

• Pallid Fat-tailed Opossum Thylamys pallidior

  The pallid fat-tailed opossum is a small marsupial of dry habitats and high-elevation grasslands. It stores fat near the base of its tail and is mainly terrestrial, though it can climb shrubs and small trees.

• White-bellied Slender Opossum Marmosops (Marmosops) noctivagus

  The white-bellied slender opossum has dull reddish-brown dorsal fur. In a lowland Peruvian rainforest study, it was recorded in both terrestrial and lower arboreal small-mammal communities.

• Elegant Fat-tailed Mouse Opossum Thylamys elegans

  Its tail stores fat and changes in thickness by season with food availability. The coat is tricolored: darker on the back, paler on the sides, and cream-colored underneath.

• Gray Slender Opossum Marmosops (Marmosops) incanus

  Males are larger than females, and coat color varies with age and region. It lives along the Atlantic coast of eastern Brazil and searches for insects on both the ground and in trees.

• Agricola’s Opossum Cryptonanus agricolai

  This is a small opossum. Ventral fur is unbanded white in most examined specimens, and little is known about its field ecology.

• Karimi's Fat-tailed Mouse Opossum Thylamys karimii

  Karimi's fat-tailed mouse opossum has a thick tail whose size changes with seasonal food availability. Juveniles were captured in both wet and dry seasons, suggesting it might breed year-round.

• Dwarf Fat-tailed Mouse Opossum Thylamys velutinus

  The velvety fat-tailed opossum has been recorded in Brazil’s Cerrado and has a tail whose thickness changes seasonally.

• Paraguayan Fat-tailed Mouse Opossum Thylamys macrurus

  This small opossum is known from eastern Paraguay and adjacent central-western Brazil. Its mid-back is darker, becoming paler toward the flanks and belly.

• Dry Chaco Fat-tailed Opossum Thylamys pulchellus

  This small opossum is recorded in northern Argentina. Argentina’s 2019 assessment lists localities across several provinces, chiefly in the Chaco region.