The Simultaneous Diversification of South American Echimyid Rodents (Hystricognathi) Based on Complete Cytochrome b Sequences
✍ Scribed by Márcia C. Lara; James L. Patton; Maria Nazareth F. da Silva
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 151 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1055-7903
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✦ Synopsis
Euryzygomatomys), terrestrial (Carterodon, Hoplomys, Variation in the complete nucleotide sequence of the Proechimys, Thrichomys), or arboreal (Dactylomys, mitochondrial cytochrome b gene was examined for 32 Diplomys, Echimys, Isothrix, Kannabateomys, Lonindividuals representing 12 supraspecific taxa of chothrix, Makalata, Mesomys, and Olallamys). Com-South American rodents of the family Echimyidae monly known as spiny rats and tree rats, echimyids are (Hystricognathi). Representative genera of four other moderate-sized, with a body weight ranging from about New World hystricognath families, the Old World por-200 to 1000 g. All members have coarse fur and many cupine Hystrix, and the myomorph murid rodents Rattaxa possess flexible and flat spines distributed mostly tus and Mus were used as outgroups in phylogenetic on the back (Emmons and Feer, 1990). Fossil echimyids reconstructions. Monophyly of the family Echimyidae are diverse in Deseadan deposits (Late Oligocene, is strongly supported, a result fully consistent with exabout 25 Myr ago; MacFadden, 1985) of Patagonia and isting morphological and paleontological data relative Bolivia, which have long been considered the earliest to the taxa examined. However, relationships among record for New World hystricognaths (Wood and Patmost supraspecific taxa within the family are poorly terson, 1959;Patterson and Wood, 1982). However, resolved. Poor resolution appears not to result from Wyss et al. (1993) recently reported the presence of cavlack of data, but to a rapid, nearly simultaneous diveriomorphs (cf. Dasyproctidae) from the pre-Deseadan gence of most Recent taxa. Generic groupings that are Tinguirica fauna of Chile, with dates ranging from late moderately to strongly supported include the tree rats Eocene to early Oligocene (37.5 to 31.5 Myr). of the Brazilian Atlantic Forest (Nelomys) and Ama-In this paper we examine phylogenetic relationships zonia (Echimys, Makalata) and the Amazonian arboamong 10 of the 15 Recent genera of echimyids listed in real spiny rats Mesomys and Lonchothrix. However, the Woods (1993) based on analyses of their mitochondrial two subgenera of the terrestrial spiny rats, Proechimys, do not form a monophyletic unit, and elevation of cytochrome b (cyt b) gene sequences. 1 Woods (1993) dithe Atlantic Forest Trinomys to generic status is sup-vided the modern Echimyidae into five subfamilies, ported. The genus Hoplomys is closely related to Proefour Recent and one extinct. The monotypic Chaetomyichimys (sensu stricto), a finding supported by other monae (genus Chaetomys) has been considered either an lecular data.