Chondrichthyan | Definition, Species, & Facts | Britannica
2024年11月15日 · chondrichthyan, (class Chondrichthyes), any member of the diverse group of cartilaginous fishes that includes the sharks, skates, rays, and chimaeras. The class is one of the two great groups of living fishes, the other being the osteichthians, or bony fishes .
Chondrichthyes: Classification, Characteristics and Examples
Chondrichthyes is a class of jawed fishes having a cartilaginous skeleton. The class includes a diverse group of fishes including sharks, rays, skates and chimaeras. They are mostly marine fishes.
Chondrichthyes – Characteristics, Classification & Examples
2024年4月12日 · Chondrichthyes, derived from the Greek words “chondr” meaning cartilage and “ichthys” meaning fish, refers to a class of jawed fishes characterized by their cartilaginous skeletons.
Cartilaginous Skeleton, Gills, & Fins - Britannica
2024年11月15日 · The elasmobranchs are fishlike vertebrates that differ from bony fishes in many respects. The skeleton is composed of cartilage and, although often calcified (especially in the vertebrae), lacks true bone (except in the roots of teeth). There are five to seven fully developed gill clefts, opening separately to the exterior.
Evolution and classification - Encyclopedia Britannica
2024年11月15日 · Chondrichthyan - Cartilaginous Fish, Elasmobranchs, Holocephali: The placoderms evidently gave rise to the bony and cartilaginous fishes. Possible chondrichthyan precursors were the petalichthyids, a group of Devonian sharklike placoderms. The first fishes identified with the Chondrichthyes were sharklike in form.
Cartilaginous Fish - Characteristics, Classification, & Examples
2024年9月2日 · Cartilaginous fish, or chondrichthyans, are jawed aquatic vertebrates distinguished by their cartilaginous skeletons. Unlike the bony fish of the class Osteichthyes, cartilaginous fish belong to the class Chondrichthyes.
Chondrichthyes Definition and Examples - Biology Online
2023年5月29日 · Chondrichthyes are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage (rather than bone). They are divided into two subclasses: elasmobranchii (sharks, rays and skates) and Holocephali (chimaera, sometimes called ghost sharks).
Chondrichthyes - New World Encyclopedia
The Chondrichthyes or cartilaginous fishes are a major class of jawed fish that includes the sharks, rays, and skates, and whose skeleton is characterized by rubbery cartilage, which is very light and flexible, rather than bone, as in the bony fishes (class Osteichthyes (such …
Chondrichthyes - Animalia
Chondrichthyes are aquatic vertebrates with paired fins, paired nares, placoid scales, conus arteriosus in the heart, and a lack of opecula and swim bladders. Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates.
Chondrichthyes - Definition, Classification, Characteristics, …
2024年11月22日 · Chondrichthyes are cartilaginous fishes, which comprise sharks, rays, skates, and chimaeras, featuring skeletons made from cartilage rather than bone. Such characteristics as placoid scales, electroreceptive organs, and streamlined bodies make them important predators and scavengers in their aquatic habitats.
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