Chondrichthyes

Cartilaginous fishes Temporal range: 430–0 Ma[1][2] PreꞒ Ꞓ O S D C P T J K Pg N Late Silurian to Present
Example of cartilaginous fishes : at the top of the image, Elasmobranchii and at the bottom of the image, Holocephali.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Subphylum:	Vertebrata
Infraphylum:	Gnathostomata
Clade:	Eugnathostomata
Class:	Chondrichthyes Huxley, 1880
Subclasses and Orders
Subclass Elasmobranchii Superorder Selachimorpha Order Carcharhiniformes Order Lamniformes Order Orectolobiformes Order Heterodontiformes Order Squaliformes Order Squatiniformes Order Echinorhiniformes Order Pristiophoriformes Order Hexanchiformes Superorder Batoidea Order Myliobatiformes Order Rajiformes Order Rhinopristiformes Order Torpediniformes Subclass Holocephali Superorder Holocephalimorpha Order Chimaeriformes

Chondrichthyes or cartilaginous fishes are the sharks and their relatives. They have jaws and 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).

1. ↑ Botella, H.A.; Donoghue, P.C.J.; Martínez-Pérez, C. (2009). "Enameloid microstructure in the oldest known chondrichthyan teeth". Acta Zoologica. 90 (Supplement): 103–108. doi:10.1111/j.1463-6395.2008.00337.x.
2. ↑ "Chondrichthyes". PalaeoDB. Archived from the original on 7 March 2016. Retrieved 26 November 2013.