Relating to or belonging to the order Cumacea; having characteristics of cumaceans.
From Cumacea plus the adjective suffix -ous. This is a scientific term used in zoological texts to describe organisms belonging to this crustacean group.
Cumaceous is the kind of technical adjective that only marine biologists use regularly, but it's a reminder that the ocean contains thousands of specialized creature groups, each with their own scientific names and ecological roles that go completely unnoticed by land-dwellers.
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