"o`los whole + kefalh` head.] 11.29). Two members of the Irati are recognized at this state, Assistência, the upper, and Taquaral. holocephalic: ( hol'ō-sĕ-fal'ik ), Denoting a fetus with a complete head but having deficiencies in other body parts. Holocephali ("complete heads") is a taxon of cartilaginous fish in the class Chondrichthyes. Holocephali have a long fossil record that starts during the Devonian period. The subclass Holocephali ("complete heads") is a taxon of cartilaginous fish, of which the order Chimaeriformes is the only surviving group.. Holocephali has an extensive fossil record that starts during the Devonian period. Origin. Definition of holocephali in the Definitions.net dictionary. The subclass Holocephali ("complete heads") is a taxon of cartilaginous fish in the class Chondrichthyes. Holocephali. Little is known about these primitive forms, and the only surviving group in the subclass is the order Chimaeriformes. Meaning of holocephali. Hyponyms (class): Chimaeriformes - sole extant order; Further reading . ABSTRACT A chimaeroid mandibular dental plate from the nearshore upper Oligocene Sooke Formation west of Victoria, Vancouver Island, British Columbia, is described here as a new genus of chimaerid fish (Holocephali, Chimaeridae), Canadodus suntoki, gen. et sp. Wikipedia ; Holocephali on Wikispecies. New Latin, nominative plural of formation from Ancient Greek ὅλος (holos, “whole”) + κέφαλος (kephalos, “head”) Subclass Holocephali . Sequence analysis on living chimaera suggests the whole group originated 420 million years ago … The earliest fossils are of teeth and come from the Devonian period. A taxonomic subclass within the class Chondrichthyes – the ghost sharks or chimaera. The Permian (Cisuralian) Irati Formation, from the Brazilian southeastern Paraná Basin bears, at some levels, Chondrichthyes, besides other vertebrates. A calcified cartilaginous skeleton and internal fertilization, among other traits, link the Holocephali (“whole heads”) with the elasmobranchs.Holocephalans arguably date back to at least the Late Devonian (Fig. Holocephali on Wikipedia. nov. Outcrops of this unit are frequent at the state of São Paulo eastern belt. [holo- + G. kephalē, head] However, most fossils are teeth, and the body forms of numerous species are not known, or, at best, poorly understood. What does holocephali mean? Origin: [NL., from Gr. Living chondrichthyeans comprise the sharks and rays (Elasmobranchii, meaning plate-gilled) and the chimaeras (Holocephali, meaning whole or entire head). Freebase (0.00 / 0 votes) Rate this definition: Holocephali. Wikispecies ; Holocephali on Wikimedia Commons. The earliest fossils are of teeth and come from the Devonian period. 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