In taxonomy and biology, a member of the family Fantasiidae or a fish with characteristics similar to fantasy creatures; the exact taxonomic classification is uncertain or rare.
From 'fantasia' (imagination) + '-id' (zoological suffix for family members). This appears to be a specialized scientific term, possibly obscure or no longer in standard use.
Scientific naming sometimes creates words like 'fantaseid' when taxonomists need to classify organisms that seem almost imaginary in their appearance—deep-sea fish or ancient species with bizarre features get names that capture how unreal they look.
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