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The largest known lobe-finned fish was Rhizodus hibberti from the Carboniferous period of Scotland which may have exceeded 7 meters in length. Among the two groups of living species, the coelacanths and the lungfishes , the largest species is the West Indian Ocean coelacanth , reaching 2 m (6 ft 7 in) in length and weighing up 110 kg (240 lb).
The lobe-finned fishes are chordates of the clade Sarcopterygii. While traditionally excluded, the tetrapods (including all birds and land vertebrates ) are now included in Sarcopterygii according to cladistic taxonomy .
This list of lobe-finned fish is a comprehensive listing of all genera that have ever been included in the class Sarcopterygii, excluding purely vernacular terms and tetrapods. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful ( nomen dubium ), or were not formally published ( nomen nudum ...
Coelacanths are a part of the clade Sarcopterygii, or the lobe-finned fishes. They share membership in this clade with lungfish and tetrapods. Externally, several characteristics distinguish coelacanths from other lobe-finned fish. They possess a three-lobed caudal fin, also called a trilobate fin or a diphycercal tail. A secondary tail ...
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Osteolepis (from Greek: ὀστέον ostéon 'bone' and Greek: λεπίς lepis 'scale') [1] [2] is an extinct genus of lobe-finned fish from the Devonian period. It lived in the Lake Orcadie of northern Scotland. Osteolepis was about 20 centimetres (7.9 in) long, and covered with large, square scales.
As such mammals, sauropsids (birds and "reptiles"), and amphibians are highly derived sarcopterygians despite superficially looking nothing like the standard lobe-finned fish anatomically speaking. However, similarities can be noticed in their limb bones and tooth enamel. [4] Additionally, lungfish and tetrapods share a divided atrium. [5]