Of or relating to the Craspedota, a group of jellyfish with a characteristic membranous edge or velum.
From craspedota (the noun referring to the jellyfish group) plus the adjectival suffix -al. This is a biological classification term used to describe structural features.
When marine biologists say 'craspedotal jellyfish,' they're literally saying 'fringed-edged jellyfish'—the scientific term is just Greek describing exactly what you'd see under a microscope.
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