Osteolepiformes, also known as Osteolepidida, is a group of
prehistoric
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of ...
lobe-finned fishes
Sarcopterygii (; ) — sometimes considered synonymous with Crossopterygii () — is a taxon (traditionally a class or subclass) of the bony fishes known as the lobe-finned fishes. The group Tetrapoda, a mostly terrestrial superclass includin ...
which first appeared during the
Devonian
The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, whe ...
period. The
order
Order, ORDER or Orders may refer to:
* Categorization, the process in which ideas and objects are recognized, differentiated, and understood
* Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ...
contains the families
Canowindridae
The Canowindridae are a family of prehistoric lobe-finned fishes which lived during the Devonian period (Famennian stage, about 374 to 359 million years ago). Fossils of fishes that belonged to this family have been found in Australia, Antarctica ...
,
Megalichthyidae,
Osteolepididae and
Tristichopteridae. The order is generally considered to be
paraphyletic
In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be pa ...
because the characters that define it are mainly attributes of
stem tetrapodomorphs.
Below is a
cladogram showing the paraphyly of Osteolepiformes compiled and modified from Ahlberg and Johanson (1998).
[ See also Swartz (2012).]
References
External links
Tree of Life
Tetrapodomorphs
Prehistoric fish orders
Paraphyletic groups
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