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A juvenile specimen of the black turtle, Chelonia mydas agassizii, was located in the shores of Cabo Tamar Island in the western entrance of the Strait of Magellan, Chile. A king crab angler found the specimen, and donated it to the Río Seco Natural History Museum's vertebrate collection for further studies and exhibition. Morphological measurements and a genetic analysis derived from an mtDNA fragment amplified and sequenced, suggest that this specimen corresponds to the species Chelonia mydas agassiizii and that it is closely related to the Galapagos Islands black turtle population. Possible influences of the El Niño Southern Oscillation phenomenon on this tropical species in the Eastern South Pacific Ocean are briefly discussed.

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