Lara M C, Patton J L, da Silva M N
Museum of Vertebrate Zoology, University of California, Berkeley 94720, USA.
Mol Phylogenet Evol. 1996 Apr;5(2):403-13. doi: 10.1006/mpev.1996.0035.
Variation in the complete nucleotide sequence of the mitochondrial cytochrome b gene was examined for 32 individuals representing 12 supraspecific taxa of South American rodents of the family Echimyidae (Hystricognathi). Representative genera of four other New World hystricognath families, the Old World porcupine Hystrix, and the myomorph murid rodents Rattus and Mus were used as outgroups in phylogenetic reconstructions. Monopoly of the family Echimyidae is strongly supported, a result fully consistent with existing morphological and paleontological data relative to the taxa examined. However, relationships among most supraspecific taxa within the family are poorly resolved. Poor resolution appears not to result from lack of data, but to a rapid, nearly simultaneous divergence of most Recent taxa. Generic groupings that are moderately to strongly supported include the tree rats of the Brazilian Atlantic Forest (Nelomys) and Amazonia (Echimys, Makalata) and the Amazonian arboreal spiny rats Mesomys and Lonchothrix. However, the two subgenera of the terrestrial spiny rats, Proechimys, do not form a monophyletic unit, and elevation of the Atlantic Forest Trinomys to generic status is supported. The genus Hoplomys is closely related to Proechimys (sensu stricto), a finding supported by other molecular data.
对代表南美棘鼠科（豪猪亚目）12个超种分类单元的32个个体的线粒体细胞色素b基因完整核苷酸序列变异进行了检测。另外四个新大陆豪猪亚目科的代表性属、旧大陆豪猪猪属以及鼠形啮齿动物大鼠属和小鼠属被用作系统发育重建的外类群。棘鼠科的单系性得到了有力支持，这一结果与所研究分类单元的现有形态学和古生物学数据完全一致。然而，该科内大多数超种分类单元之间的关系尚未得到很好的解决。分辨率低似乎不是由于缺乏数据，而是由于大多数近代分类单元快速、几乎同时分化所致。得到中度至有力支持的类属分组包括巴西大西洋森林的树鼠（内洛鼠属）和亚马逊地区的树鼠（棘鼠属、马卡拉塔鼠属）以及亚马逊树栖刺鼠中棘鼠属和长棘鼠属。然而，地栖刺鼠属（原棘鼠属）的两个亚属并未形成一个单系单元，并且支持将大西洋森林的三列鼠属提升为属级地位。霍氏棘鼠属与原棘鼠属（狭义）密切相关，这一发现得到了其他分子数据的支持。
