In A. Oppel (Ed. Cartilaginous fish are considered to have evolved from acanthodians.The discovery of Entelognathus and several examinations of acanthodian characteristics indicate that bony fish evolved directly from placoderm like ancestors, while acanthodians represent a paraphyletic assemblage leading to Chondrichthyes. Chondrichthyes: (Cartilaginous Fish-Sharks, Rays, and Skates Do fishes have a nervous system? 8. All chondrichthyans breathe through five to seven pairs of gills, depending on the species. In the majority of ovoviviparous sharks and rays, organically rich uterine secretions provide supplemental nourishment, which is absorbed by the yolk sac and in many cases by appendages borne on its stalk. Web the chondrichthyes are the cartilaginous fishes, such as sharks and rays, while the osteichthyes are the bony fishes. praeside Arvid. Vertebrates comparative anatomy, function, evolution, 7th edn. The water reaches the mouth primarily through grooves leading there from the nostrils. 1254). Grogan E, Lund R (2009) Two new iniopterygians (Chondrichthyes) from the Mississippian (Serpukhovian) Bear Gulch Limestone of Montana with evidence of a new form of chondrichthyan neurocranium. 2, pp. Kempster, R. M., McCarthy, I. D., & Collin, S. P. (2012). Diverse species of fish are included in the class, such as sharks, rays, skates, and chimaeras. https://doi.org/10.1007/978-3-319-55065-7_1018, DOI: https://doi.org/10.1007/978-3-319-55065-7_1018, eBook Packages: Behavioral Science and PsychologyReference Module Humanities and Social Sciences. Pisces are classified into three categories: Placodermi (Aphstohyoids) Chondrichthyes; Osteichthyes; Placodermi (Aphstohyoids) All members of this class are extinct today. https://doi.org/10.1002/jmor.1068. Habitat: Majority of the Elasmobranchii live in saltwater ocean; however, an estimated 43 species including skates, smooth dogfishes, river sharks, pajama catsharks, and sandfishes, stingrays, sawfishes, and bull shark and many more are known to feed or reproduce in freshwater rivers. The relation of inner ear structure to the feeding behavior in sharks and rays. In either in their mouth or along whisker-like Boca Raton: CRC Press. Lisney, T. J., & Collin, S. P. (2007).

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