The reclassification reduced the range of C. porteri on the same Santa Cruz Island and from C. donfaustoi also shares a set of nucleotides distinct from that of C. donfaustoi differs from other tortoises by allele frequency at 12 microsatellite loci, which allowed assignment to the genetically distinct cluster. chathamensis on San Cristóbal, and is part of a clade that also includes C. In 2015, Chelonoidis niger donfaustoi was reclassified as a new subspecies on the basis of genetic and morphological data. Tortoises are aided in oceanic dispersal by their ability to float with their heads up, and to survive up to six months without food or water. Cerro Monturra tortoises are most closely related to duncanensis tortoises from Pinzón, Cerro Fatal to chathamensis from San Cristóbal, while Reserva tortoises are closer to the four southern races of Isabela. Although traditionally classified together, the lineages were all shown to be more closely related to tortoises on other islands than to each other, and thus are thought to be the result of three separate colonizations of the island. Tortoise populations on Santa Cruz Island Įarlier mitochondrial DNA studies of tortoises on Santa Cruz showed up to three genetically distinct lineages found in nonoverlapping population distributions around the regions of Cerro Monturra in the northwest, Cerro Fatal in the east, and La Reserva (or La Caseta) in the southwest. donfaustoi was classified as part of another subspecies, Chelonoidis porteri. Chelonoidis niger donfaustoi, known as the eastern Santa Cruz tortoise, is a subspecies of Galápagos tortoise living on Santa Cruz Island, within the Galápagos.
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