The Galapagos catshark is known only from waters around several of the Galapagos Islands, including San Cristobal Island, Darwin Island, Marchena Island and Fernandina Island.
San Cristóbal Island, the easternmost island in the Galápagos archipelago
Its vegetation includes Calandrinia galapagosa, Lecocarpus darwinii, trees such as Lignum vitae, Matazarna.
Makira (formerly San Cristobal), the largest island of Makira-Ulawa Province in the Solomon Islands
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Due to human disturbance to their natural habitat, a dwindling food supply because of new predators introduced to the islands, and predation by humans, they are now extinct on the islands of Baltra, Daphne, Floreana, San Cristobal, and Seymour.
In November 1999, scientists reported Lonesome George was "very closely related to tortoises" from Española Island (C. n. hoodensis) and San Cristóbal Island (C. n. chathamensis).