 Other common names include black-tipped shark, great blacktip shark, inkytail shark, large blacktip shark, long-nose grey shark, longnose grey whaler, and smoothfang shark.Based on similarities in morphology, tooth shape, and behavior, the closest relatives of the spinner shark were originally believed to be the blacktip shark and the graceful shark ("C. amblyrhynchoides").However, this interpretation was not supported by Gavin Naylor's 1992 allozyme analysis, which suggested that these similarities are the product of convergent evolution and that the closest relative of the spinner shark is the copper shark ("C. brachyurus").