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Nelson, J.S., 1994

Acipenseriformes sturgeons and paddlefishes

Chondrostei

Polypteriformes 200 M years

Helfman, G., B. Collette and D. Facey, 1997  |  Carroll, R., 1988

middle Jurassic

Marin

Eau douce

Saumâtre

Caudal fin heterocercal; myodome and preopercle reduced or absent; gulars absent; skeleton largely cartilaginous; fin rays more numerous than their basals; intestine with spiral valve.

Greek aktis = ray, thunderbolt, beam + Greek pterygion, diminutive of pteryx = wing, fin. Ref. 45335.

Latin, acipenser = sturgeon + Latin, forma = shape (Ref. 45335).

( n = 2 ) -
Acipenseridae Polyodontidae

Ref.
[ e.g. 9948]                       

Glossary
                    [ e.g. cephalopods]