Revised 1 Nov. 2025
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Megachasma Taylor, Compagno & Struhsaker 1983 mégas (μέγας), big; cháskō (χάσκω), yawning hole or open mouth, referring to its unusually large oral cavity

Megachasma pelagios Taylor, Compagno & Struhsaker 1983 pelágios (πελάγιος), “of the sea,” referring to its oceanic, epipelagic habitat