Journal of Biology | Abstract | Colugos: obscure mammals glide into the evolutionary limelight

http://jbiol.com/content/7/4/13/abstract --- Substantial molecular evidence indicates that tree-shrews, colugos and primates cluster together on the mammalian phylogenetic tree. Previously, a sister-group relationship between colugos and primates seemed likely. A new study of colugo chromosomes indicates instead an affinity between colugos and tree-shrews.
http://www.science.psu.edu/alert/Miller10-2007.htm