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Noun1.holocephalian - fish with high compressed head and a body tapering off into a long tail
cartilaginous fish, chondrichthian - fishes in which the skeleton may be calcified but not ossified
Holocephali, subclass Holocephali - chimaeras and extinct forms
chimaera - a deep-sea fish with a tapering body, smooth skin, and long threadlike tail
References in periodicals archive ?
Although the most distinctive feature of the holocephalian dentition are their tooth plates, which constitute the common organic remains fossilized, these plates are poorly known, and their fossil record has been sparse and difficult to recognize or determine.