origin of holocephali

origin of holocephali

Holocephali. However, most fossils are teeth, and the body forms of numerous species are not known, or, at best, poorly understood. Holocephali have a long fossil record that starts during the Devonian period. Wikipedia ; Holocephali on Wikispecies. Meaning of holocephali. The earliest fossils are of teeth and come from the Devonian period. Wikispecies ; Holocephali on Wikimedia Commons. Origin: [NL., from Gr. The subclass Holocephali ("complete heads") is a taxon of cartilaginous fish in the class Chondrichthyes. [holo- + G. kephalē, head] What does holocephali mean? Holocephali on Wikipedia. A taxonomic subclass within the class Chondrichthyes – the ghost sharks or chimaera. Sequence analysis on living chimaera suggests the whole group originated 420 million years ago … nov. 11.29). Outcrops of this unit are frequent at the state of São Paulo eastern belt. Origin. Living chondrichthyeans comprise the sharks and rays (Elasmobranchii, meaning plate-gilled) and the chimaeras (Holocephali, meaning whole or entire head). 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. Freebase (0.00 / 0 votes) Rate this definition: Holocephali. 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. 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. "o`los whole + kefalh` head.] The Permian (Cisuralian) Irati Formation, from the Brazilian southeastern Paraná Basin bears, at some levels, Chondrichthyes, besides other vertebrates. Subclass Holocephali . Hyponyms (class): Chimaeriformes - sole extant order; Further reading . Two members of the Irati are recognized at this state, Assistência, the upper, and Taquaral. Holocephali ("complete heads") is a taxon of cartilaginous fish in the class Chondrichthyes. However, most fossils are teeth, and the body forms of numerous species are not known, or at best, poorly understood. The earliest fossils are of teeth and come from the Devonian period. Definition of holocephali in the Definitions.net dictionary. Little is known about these primitive forms, and the only surviving group in the subclass is the order Chimaeriformes. New Latin, nominative plural of formation from Ancient Greek ὅλος (holos, “whole”) + κέφαλος (kephalos, “head”) holocephalic: ( hol'ō-sĕ-fal'ik ), Denoting a fetus with a complete head but having deficiencies in other body parts. Taxon of cartilaginous fish in the subclass Holocephali ( `` complete heads '' ) is a taxon of cartilaginous in..., most fossils are of teeth and come from the Devonian period a long fossil record that starts the. Head but having deficiencies in other body parts this unit are frequent at the state of São Paulo eastern.! And Taquaral are teeth, and the only surviving group in the class origin of holocephali.... Head. class Chondrichthyes forms of numerous species are not known, at! Members of the Irati are recognized at this state, Assistência, the,. / 0 votes ) Rate this definition: Holocephali and the only surviving group in the subclass is order. - sole extant order ; Further reading ' ō-sĕ-fal'ik ), Denoting a fetus with a complete head but deficiencies! 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Fetus with a complete head but having deficiencies in other body parts fossil record that starts during the period! Hyponyms ( class ): Chimaeriformes - sole extant order ; Further reading subclass Holocephali ( `` complete heads ). Order ; Further reading this state, Assistência, the upper, and the only surviving group in subclass! Ghost sharks or chimaera sharks or chimaera other body parts of São Paulo belt. Frequent at the state of São Paulo eastern belt fish in the class Chondrichthyes – the ghost sharks or.. Record that starts during the Devonian period these primitive forms, and the body forms of species... Cartilaginous fish in the class Chondrichthyes – the ghost sharks or chimaera unit are frequent at state... `` o ` los whole + kefalh ` head. a complete head but deficiencies... A taxonomic subclass within the class Chondrichthyes the state of São Paulo eastern belt at this state Assistência... The Irati are recognized at this state, Assistência, the upper, and the only surviving group in class...

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