Fig. 20 in The Mammals Of Paracou, French Guiana: A Neotropical Lowland Rainforest Fauna Part 2. Nonvolant Species

Fig. 20. Sexually dimorphic wrist morphology of members of the Marmosops parvidens species group. Adult males (left) possess an externally obvious lateral carpal tubercle that is supported internally by an enlarged pisiform bone (arrows); females (right) do not show this character (see Lunde and Schutt, 1999, for further details). Marmosops parvidens and M. pinheiroi, both members of the Paracou fauna, have similar wrist morphologies, but males of other taxa referable to the M. parvidens species group (e.g., M. juninensis, see text) differ in the size and shape of the lateral carpal tubercle. Illustrated specimens are examples of Marmosops pinheiroi from Paracou: top and bottom left, AMNH 267346; top and bottom right, AMNH 267342.