| retinal photoreceptors of two subterranean tuco-tuco species (rodentia, ctenomys): morphology, topography, and spectral sensitivity. | traditionally, vision was thought to be useless for animals living in dark underground habitats, but recent studies in a range of subterranean rodent species have shown a large diversity of eye features, from small subcutaneous eyes to normal-sized functional eyes. we analyzed the retinal photoreceptors in the subterranean hystricomorph rodents ctenomys talarum and ctenomys magellanicus to elucidate whether adaptation was to their near-lightless burrows or rather to their occasional diurnal surf ... | 2010 | 20737597 |
| karyotype evolution in south american subterranean rodents ctenomys magellanicus (rodentia: octodontidae): chromosome rearrangements and (ttaggg)n telomeric sequence localization in 2n=34 and 2n=36 chromosomal forms. | ctenomys is the most numerous genus of south american subterranean rodents and one of the most karyotypically diverse clades of mammals known. ctenomys magellanicus is the southernmost species of the group and the only one living in isla grande de tierra del fuego (argentina). this species presents two chromosomal forms, i.e. 2n=34, and 2n=36 (fn=68). recent studies suggest that genetic divergence between both karyotypic forms resulted from a chromosomal speciation process. in order to identify ... | 2003 | 14641468 |