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heterocercal tail

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Acanthodii

Overview page. Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

Class of primitive, fossil fish that had a true bony skeleton, a heterocercal tail fin, a persistent notochord, ganoid scales, and stout spines in front of the fins. The acanthodians lived...

See overview in Oxford Index

Acipenseriformes

Overview page. Subjects: Zoology and Animal Sciences.

(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,...

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Amiidae

Overview page. Subjects: Zoology and Animal Sciences.

; infraclass Holostei, order Amiiformes)

A family with only one living representative, Amia calva, a fairly large (up to 6 kg) carnivorous fish that has a long dorsal fin with only...

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Antiarchi

Overview page. Subjects: Zoology and Animal Sciences.

(class Placodermi)

Group or order of fossil, Devonian Period, fish, possibly related to sharks. The trunk shield, which was larger than the head shield, possessed a pair of...

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Cephalaspidiformes

Overview page. Subjects: Zoology and Animal Sciences.

(class Cephalaspidomorphi, superorder Cephalaspidomorpha)

An order of fish-like, fossil vertebrates which lived during the late Silurian to Devonian Periods. They had somewhat...

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Chondrostei

Overview page. Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

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...

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Climatiiformes

Overview page. Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

; class Acanthodii)

One of the larger orders of fossil fish that had bony jaws and body skeleton, ganoid scales, a heterocercal tail, and stout spines located before the dorsal,...

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Crossopterygii

Overview page. Subjects: Earth Sciences and Geography.

; class Osteichthyes)

A subclass of bony fish that includes both fossil and living lobe-finned or tassel-finned fish, including the Coelacanthimorpha and Rhipidistia.

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Dipnoi

Overview page. Subjects: Earth Sciences and Geography — Biological Sciences.

A subclass or order of bony fishes that contains the lungfishes, which have lungs and breathe air. They are found in Africa, Australia, and South America, where they live in freshwater...

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Osteostraci

Overview page. Subjects: Earth Sciences and Geography.

(superclass Agnatha)

Order of extinct, fish-like, jawless vertebrates, ranging from the Silurian to the Devonian. They had somewhat flattened bodies, a broad head covered in a bony...

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Placodermi

Overview page. Subjects: Earth Sciences and Geography — Zoology and Animal Sciences.

A class of archaic, jawed (gnathostome), and heavily armoured fish, which appeared in the Devonian Period and which were virtually extinct by its end. They were rather diverse in body form....

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Rhipidistia

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

Group of crossopterygian (‘tassel-finned’) fish ranging from the Devonian to the Permian. They possessed two dorsal fins, lobate or stalked pectoral and pelvic fins, and internal nostrils....

See overview in Oxford Index