Revised 15 Nov. 2022
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Megachasma Taylor, Compagno & Struhsaker 1983 mégas (Gr. μέγας), big; cháskō (Gr. χάσκω), yawning hole or open mouth, referring to its unusually large oral cavity

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