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.

Feb 8, 2025 · 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. The name Selachii is also sometimes used for the group containing the sharks.

Dec 27, 2024 · At this time the chondrichthyan fishes, which had reached their greatest flowering during the Carboniferous, became greatly reduced. They remained so until the Jurassic (about 190 million years ago), when the areas of the seas expanded and those of the land diminished.

Dec 27, 2024 · Chondrichthyan - Cartilaginous Skeleton, Gills, & Fins: Chondrichthyans have distinguishing features like a cartilaginous skeleton, five to seven fully developed gill clefts, and sense organs in the lateral line system that help locate vibrations of low frequencies, temperature, salinity, and minute electrical stimuli.

Apr 12, 2024 · 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. Unlike the bony fishes known as Osteichthyes, which have skeletons primarily composed of bone tissue, Chondrichthyes have skeletons primarily composed of cartilage.

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 …

Sep 2, 2024 · 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.

The chondrichthyans have jaws, paired fins, paired nostrils, scales, and two-chambered hearts. The taxonomy of Chondrichthyes reveals both the connectedness of living organisms and the diversity in nature. The Chondrichthyes, because of sharing common origin, all …

May 29, 2023 · 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).

Origins: 439 million years ago (early Silurian, Aeronian stage) Extinction: Still extant. Chondrichthyans (from the Ancient Greek khóndros, meaning "cartilage", and ikhthús, meaning "fish"), also...