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Chondrostei

Chondrostei (chondrostean fish) Group of bony fish belonging to the subclass Actinopterygii. Often ranked as a super-order, the chondrosteans have a partly cartilaginous skeleton (see CARTILAGE), a heterocercal tail, a spiracle, and an intestinal spiral valve. The group includes the extant orders Acipenseriformes and Polypteriformes, and the extinct order Palaeonisciformes (palaeoniscids, or ‘ancient fish’).

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"Chondrostei." A Dictionary of Earth Sciences. . Encyclopedia.com. 23 Jun. 2017 <http://www.encyclopedia.com>.

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"Chondrostei." A Dictionary of Earth Sciences. . Retrieved June 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chondrostei

Chondrostei

Chondrostei A group of bony fish belonging to the subclass Actinopterygii. Often ranked as a superorder, the chondrosteans have a partly cartilaginous skeleton, a heterocercal tail, a spiracle, and an intestinal spiral valve. Apart from a number of fossil orders, it includes the extant order Acipenseriformes.

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"Chondrostei." A Dictionary of Zoology. . Encyclopedia.com. 23 Jun. 2017 <http://www.encyclopedia.com>.

"Chondrostei." A Dictionary of Zoology. . Encyclopedia.com. (June 23, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chondrostei-0

"Chondrostei." A Dictionary of Zoology. . Retrieved June 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chondrostei-0