Chondrostei


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Chondrostei

a group of bony fish characterized by the presence of a spiracle, a HETEROCERCAL TAIL and a spiral valve in the gut; for example, sturgeon.
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Although there is no evidence for the occurrence of a conical rotation in the medaka egg, embryos of some primitive fishes that undergo holoblastic cleavage (species in the Superorder Chondrostei within the Actinopterygii, for example the sturgeon, Acipenser guldenstadti) do form a gray crescent and thus perhaps do undergo a cortical rotation (reviewed by Bolker, 1993; see also Clavert, 1962; Ginsburg and Dettlaff, 1991).