Daptomys

23 p. : ill. ; 24 cm.Includes bibliographical references (p. 22-23)."The cricetine genus Daptomys is a South American amphibious mouse known by four specimens, three from eastern and southern Venezuela and one from eastern Perú. The three from Venezuela are examples of D. venezuelae, a species described by Anthony in 1929. The specimen from Perú represents a new species which we name and describe. We also report on morphological variation among the three examples of D. venezuelae, compare them with the Peruvian specimen, and provide information about habitat"--P. [1]

Relationships of Marmosa formosa

18 p. : ill. (some col.) ; 26 cm.Includes bibliographical references (p. 16-17).The holotype and only known specimen of Marmosa formosa Shamel, a nominal species currently synonymized with Gracilinanus agilis Burmeister, is strikingly unlike any other known didelphid marsupial. Phylogenetic analyses based on nonmolecular characters and IRBP sequences suggest that formosa is either the sister-taxon of Thylamys (including Lestodelphys) or Monodelphis. Because neither alternative is strongly supported by the data at hand, and because including formosa in Thylamys or in Monodelphis would compromise the diagnosability of those taxa, a new genus--Chacodelphys--is proposed to contain it. Currently known only from northern Argentina, Chacodelphys formosa may be widely distributed in the Chaco and other adjacent Neotropical biomes