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Family Polyodontidae - Paddlefishes
Order:	Acipenseriformes
Class:	Actinopterygii
No. of Genera:	2
No. of Species:	2
Environment:	Fresh:  Yes     Brackish:  No     Marine:  No
Aquarium:	some
First Fossil Record:	upper  Cretaceous,                 Ref.:      Berg, L.S..1958
Remark:	Distribution: China and United States. Snout resembling a paddle and with minute barbels. Body scaleless (naked) except for a few scales on caudal peduncle. Heterocercal caudal fin. Gill rakers long and numerous (hundreds) in the planktivorous Polyodon. Minute teeth. Spiracle present. Operculum greatly extended posteriorly. Mouth protrusible or nonprotrusible. Two monotypic genera (Polyodon and Psephurus). Exhibited in public aquaria and used for food. Both species are under threat.
Etymology:	Greek, poly = a lot of + Greek, odous = tooth, teeth ( Ref. 45335).
Division:	Primary freshwater
Reproductive guild:	nonguarders
Typical activity level:	active
Main Ref.:	Nelson, J.S..1984
Coordinator:
Show species | Nominal species list for Polyodontidae | CAS specimen photos | References

Update | Add new Family	Ref.:				Glossary
		( e.g. 9948)				( e.g. cephalopods)

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Page created by: Eli, 04.10.04, last modified by: Eli, 22.11.04