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Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Parvphylum: Chondrichthyes
Class: Holocephali
Name derivation: “complete heads”
Family Count: 3
Genus Count: 6
Species Count: 56
Earliest Fossil Record: Early Devonian 400 mya
Habitat: Marine
Size Range: up to 1.5 m
Notes: Based on Catalogue of Life as of March 2025