The phylogenetic significance of strepsirhinism in Paleogene primates |
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Authors: | K Christopher Beard |
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Institution: | (1) Department of Cell Biology & Anatomy, The Johns Hopkins University, School of Medicine, 21205 Baltimore, Maryland |
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Abstract: | Two lines of evidence reviewed here argue against the recent proposal that strepsirhinism is an apomorphous feature in primates,
shared only by adapiforms and lemuriforms. These are (1) the presence of strepsirhinism in several extant taxa of nonprimate
mammals, including Tupaiidae, Tenrecidae, Erinaceus,and Didelphis,and (2) the inferred presence of strepsirhinism not only in adapiforms, but also in all plesiadapiforms and omomyids for which
the relevant anatomical regions are known. Therefore, strepsirhinism cannot be invoked as an adaptive innovation underlying
the initial strep-sirhine/haplorhine dichotomy. Likewise, the apparent retention of strepsirhinism in omomyids suggests either
that the haplorhine oronasal configuration of extant tarsiids and anthropoids was acquired independently or that tarsiids
and anthropoids form a clade to the exclusion of omomyids. |
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Keywords: | strepsirhinism Adapiformes Omomyidae Plesiadapiformes incisors |
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