Acipenseriformes
Acipenseriformes (subclass Actinopterygii, superorder Chondrostei) An order of rather primitive fish characterized by a cartilaginous skeleton, a heterocercal tail fin, and a head with a pointed, protruding rostrum and ventrally located mouth. Extant members of the order either have a naked skin or possess five rows of large, rhomboid, bony scales along the body; a spiral valve is found in the intestinal tract. Apart from the sturgeon and paddlefish the order includes a number of fossil representatives dating back to the Carboniferous Period.
More From encyclopedia.com
Salmoniformes , Salmoniformes (subclass Actinopterygii, superorder Protacanthopterygii) An order of bony fish that have a single dorsal fin which, like the pelvic fi… Anglerfishes , Lophiiformes (subclass Actinopterygii, superorder Paracanthopterygii) An order of marine, bottom-dwelling fish that have a relatively large head, wid… Scale (zoology) , scales The small bony or horny plates forming the body covering of fish and reptiles. The wings of some insects, notably the Lepidoptera (butterflies… Teleosts , Teleostei (teleost, teleostean) Somewhat loosely defined term (an infraclass or super-order according to some authors) that includes all the living b… Order , Order
Few notions have both so rich a heritage of meaning and so clear an application to all fields of knowledge as does order. There are many myths… Placodermi , Placodermi Class of archaic, jawed (gnathostome), and heavily armoured fish, which appeared in the Devonian and which were virtually extinct by the e…
You Might Also Like
NEARBY TERMS
Acipenseriformes