 Phylogenetic analysis may help to " resurrect " the extinct subspecies of Floreana ( C. n. nigra ) — a subspecies known only from subfossil remains . Some tortoises from Isabela were found to be a partial match for the genetic profile of Floreana specimens from museum collections , possibly indicating the presence of hybrids from a population transported by humans from Floreana to Isabela , resulting either from individuals deliberately transported between the islands , or from individuals thrown overboard from ships to lighten the load . Nine Floreana descendants have been identified in the captive population of the Fausto Llerena Breeding Center on Santa Cruz ; the genetic footprint was identified in the genomes of hybrid offspring . This allows the possibility of re @-@ establishing a reconstructed subspecies from selective breeding of the hybrid animals . Furthermore , individuals from the subspecies possibly are still extant . Genetic analysis from a sample of tortoises from Volcan Wolf found 84 first @-@ generation C. n. nigra hybrids , some less than 15 years old . The genetic diversity of these individuals is estimated to have required 38 C. n. nigra parents , many of which could still be alive on Isabela Island . 
