Chondrichthyes - Wikipedia
Chondrichthyes are aquatic vertebrates with paired fins, paired nares, placoid scales, conus arteriosus in the heart, and a lack of opercula and swim bladders. Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates.
Chondrichthyan | Definition, Species, & Facts | Britannica
2024年12月27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 – 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.
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 - 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 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).
Evolution and classification - Encyclopedia Britannica
2024年12月27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.
Chondrichthyes - UCL
Chondrichthyes are an ancient and successful clade, having survived 400 million years of changing environments. Yet human presence and intervention has put them at risk. The life history of Chondrichthyes marks them as vulnerable to extinction.
Introduction to the Chondrichthyes - University of California …
Sharks, skates, rays, and even stranger fish make up the Chondrichthyes, or "cartilaginous fish." First appearing on Earth almost 450 million years ago, cartilaginous fish today include both fearsome predators and harmless mollusc-eaters (harmless, that is, unless you are a mollusc).
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.