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I’ve Seen That – Sepioteuthis sepioidea

The Caribbean Reef Squid (Sepioteuthis sepioidea) is the most common species of squid across the Cayman Islands. Divers and snorkelers can often see them traveling together in groups of 2 or more, usually in shallower areas of the reef less than 30 feet. Here are some “squidy” fun facts:

  • Adults grow up to 8” long and are semelparous—females die after laying eggs and males die shortly after fertilizing them
  • Have 3 hearts that pump blue blood due to a copper-containing protein called hemocyanin
  • Able to change color instantly (multiple colors or half and half)—useful for hunting, camouflage, and attracting a mate
  • Have the largest eye-to-body ratio in the animal kingdom
  • Can bioluminescence during the day or night
  • Can be blinded at night by dive lights, making them more vulnerable to predators

logo-ccmiLearn more about our marine environment and creatures from Katie Correia, Science & Education Manager at Central Caribbean Marine Institute, Little Cayman Research Center. For more info on the CCMI, visit

Winter 2019