Cladoselachidae is an extinct
family
Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...
of
holocephalian
Holocephali ("complete heads"), sometimes given the term Euchondrocephali, is a subclass of cartilaginous fish in the class Chondrichthyes. The earliest fossils are of teeth and come from the Devonian period. Little is known about these primiti ...
cartilaginous fish
Chondrichthyes (; ) is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fishes'', which have skeletons primarily composed of bone tissue. ...
es closely related to
Symmoriiformes.
They are the only members of the order Cladoselachiformes and were characterized by having an elongated body with a spine in each of the two dorsal fins.
References
Cladoselachiformes ''Dictionary of Zoology'' (1999).
Evolution and paleontology (fish) Animal Aqua.
Devonian sharks
Carboniferous sharks
Permian sharks
Prehistoric cartilaginous fish families
Devonian first appearances
Permian extinctions
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