A taxonomic subclass or grouping of cartilaginous fish that includes the Chimaeridae family and related species, characterized by their distinctive morphology.
From chimaeroid plus -ei (Latin taxonomic plural ending). This represents an older or alternative scientific classification system for deep-sea cartilaginous fishes.
Chimaeroidei is a scientific classification that's become less common as genetic sequencing has revealed exactly how these fish relate to sharks and rays—it's a reminder that taxonomy keeps evolving as we learn more!
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