six-gilled shark

Noun
  1. Large primitive shark widely distributed in warm seas (synset 101485662)
    is a type of: shark - any of numerous elongate mostly marine carnivorous fishes with heterocercal caudal fins and tough skin covered with small toothlike scales
    belongs to: genus hexanchus, hexanchus - a genus of Hexanchidae
    same as: cow shark, hexanchus griseus

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