Molecular phylogeny of tuco-tucos, genus Ctenomys (Rodentia: Octodontidae): Evaluation of the mendocinus species group and the evolution of asymmetric sperm

被引：45

作者：

D'Elía G. ^{[1
,2
]}

Lessa E.P. ^{[1
]}

Cook J.A. ^{[3
]}

机构：

[1] Laboratorio de Evolución, Facultad de Ciencias, Montevideo 11300

[2] University of Michigan, Museum of Zoology, Ann Arbor, MI 48109-1079

[3] University of Alaska Museum, Institute of Arctic Biology, Fairbanks, AK 99775-6960

来源：

Journal of Mammalian Evolution | 1999年 / 6卷 / 1期

关键词：

Ctenomys; Cytochrome b; Hystricognathi; Sperm evolution; Systematics; Tuco-tuco;

D O I：

10.1023/A:1020586229342

中图分类号：

学科分类号：

摘要：

The phylogenetic relationships among 23 individuals representing 14 species of underground hystricognath rodents of the genus Ctenomys were studied by analyzing variation of complete cytochrome b gene sequences. Maximum parsimony, neighbor joining, and maximum likelihood analyses were performed, using the octodontine genera Octadon and Tympanoctomys as outgroups. Our analyses support previous studies based on chromosomes and skull morphology that suggested a clade comprised of Argentinean and Uruguayan populations of C. rionegrensis. This clade is closely related to one comprised of C. flamarioni and the C. mendocinus species complex. Our analyses provide evidence that the symmetric sperm morph, which is common to other South American hystricognath rodents, is the plesiomorphic character state in Ctenomys and in Hystricognathi. Our analyses do not support the hypothesis that the sperm morphs define two major lineages of tuco-tuco species, because species with asymmetric sperm are diphyletic on the basis of cytochrome b sequences, and this morphology appears to have evolved twice in Ctenomys. © 1999 Plenum Publishing Corporation.

引用

页码：19 / 38

页数：19

共 61 条

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