Primates are phylogenetically divided into Strepsirrhini ("curly-nosed" primates with rhinariums, which is the ancestral condition) and Haplorrhini ("simple-nosed" primates which have replaced the rhinarium with a more mobile, continuous, dry upper lip).
Mammals with rhinariums tend to have a stronger sense of olfaction, and the loss of the rhinarium in the haplorrhine primates is related to their decreased reliance on olfaction, being associated with other derived characteristics such as a reduced number of turbinates.
Note that the traditional paraphyletic "prosimian" division of primates cannot be characterised by the presence of a rhinarium, due to its absence in the tarsiers, and loss of the rhinarium is not a synapomorphy of the simians or anthropoids, but a symplesiomorphy shared with the tarsier outgroup.
Multigene phylogeny of the Mustelidae: Resolving relationships, tempo and biogeographic history of a mammalian adaptive radiation.(Research article)
Feb 14, 2008; Authors: Klaus-Peter Koepfli (corresponding author) ; Kerry A Deere ; Graham J Slater ; Colleen Begg ; Keith Begg...
Mexican Uroleucon (Hemiptera: Aphididae) from the Collection of the Museum National D'histoire Naturelle of Paris with Eleven New Species
Sep 01, 2011; The genus Uroleucon Mordvilko, 1914 (Aphididae Aphidinae Macrosiphini) is a hyper-diverse genus widely distributed throughout the...