A genus of extinct prehistoric cephalopods or mollusks, known from fossil records.
Scientific Latin nomenclature combining costa (rib or ridge) with -aea (genus suffix), likely referring to ribbed or ridged fossil shells characteristic of these ancient marine organisms.
When scientists name fossil creatures, they're essentially writing a description in Latin—costaea probably had ridged shells, so they literally called it the 'ribbed one' in scientific language.
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