Chondrichthyes

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Related to Selachians: subclass Elasmobranchii, Elasmobranchs

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 the Submeseta Allomember, there is a dramatic diminution of diversity of those selachians that dominated below, there are no teleost taxa characteristic of warm water (e.g., Labridae, Oplegnathidae, Xiphiorhynchidae), sharks dramatically decreases in diversity and quantity (a few Pristiophorus and odontaspidid teeth) and begin to predominate some sharks (Lamna) and teleosts with species characteristic of colder waters (e.g., gadiforms of the informal genus "Mesetaichthys") are recorded.
Included in the selachians were two species from the family Orectolobidae--Orectolobus maculatus (Bon-naterre, 1778) and Orectolobus ornatus (De Vis 1883); one species from the family Hemiscylliidae--Hemiscyllium ocellatum (Bonnaterre, 1788); and two species from the family Carcharhinidae-Carcharhinus melanopterus (Quoy and Gaimard, 1824) and Negaprion acutidens (Riippell, 1837).
Cretaceous fishes, selachians and ptychodonts: Univ.
(18.) Case GR: Late Eocene selachians from South Central Georgia.
(1990) provided a preliminary list of the Lano vertebrates, including actinopterygians, lissamphibians, squamates, turtles, crocodyliforms, dinosaurs, pterosaurs, and mammals from the continental deposits, and selachians from the marine beds.
& BALBINO, A,C., 2003: Uppermost Miocene lamniform selachians (Pisces) from the Alvalade basin (Portugal).--Ciencias da Terra, 15: 141-154.
& PENCE, R.,1989: Selachians from the Hosta Tongue of the Point Lookout Sandstone (Upper Cretaceous, Santonian), Central New Mexico.New Mexico Geol.
The selachians (sharks and rays), such as Isurus desori, Isogomphodon caunellensis, and Hemipristis serra, from San Gerardo de Limoncito are Miocene taxa (Laurito & Valerio, 2008a).