Chondrichthyes

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Related to selachian: elasmobranch, dogfish, Selachii

Chondrichthyes

a class of the phylum Chordata containing the cartilaginous fish, sharks, rays and chimaeras. In some classifications, the term is synonymous with ELASMOBRANCHII. They are the lowest vertebrates with complete and separate vertebrae, moveable jaws and paired appendages. All are predators and virtually all are marine. They are characterized by the absence of true bone and the presence of CLASPERS (1) in males, and DENTICLES.
References in periodicals archive ?
In elasmobranchs, these scales are known as placoid scales, or denticles, and in most selachians, a thin layer of mucus lies underneath the denticles to protect the epidermis.
Case GR and Cappetta H: The Eocene Selachian fauna from the Fayum Depression in Egypt.
The lack of diagnostic fossils makes difficult an ac curate stratigraphic assignment, but according to the selachian content a Late, but not latest, Maastrichtian age is given (Cappetta and Corral, 1999).
The only mention of a selachian is that "The electric ray (torpedo) is named because it makes the body become numb (torpescere) if anyone touches it while it is alive" (Barney et al.
Olson and Welton (1986:49) listed the selachian taxa and otoliths of unidentified sciaenids and bothids.
Espinosa-Arrubarrena (1979) and Espinosa-Arrubarrena and Applegate (1981) suggested a late Pliocene age for the selachian fauna of locality IGM 92 (Los Algodones) based on the stratigraphic ranges of the shark species, and a similarity between the invertebrate fauna that was collected at Espinosa-Arrubarrena's locality BCS-43 and faunas in the Imperial Formation in California and the San Marcos Formation near Santa Rosalia, Baja California.
The habitat where the Chimaera specimen lived was established by the author based on the selachian and osteichthyan associated fossil fauna and the sedimentological evidence.
Many of these latter worthies sported dental formulae more commonly associated with selachians such as the ragged-tooth shark (Odontaspis taunts) or some of the larger inshore members of the Sparidae, or sea-bream family, specifically the so-called poenskop or black mussel cracker (Cvmatoceps nasutus).