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Actinopterygii or the ray-finned fishes, constitute a class or subclass of the bony fishes. The ray-finned fishes are so called because their fins are webs of skin supported by bony or horny spines (“rays”), as opposed to the fleshy, lobed fins that characterize the class Sarcopterygii (lobe-finned fish). A – dorsal fin: B – fin rays: C – lateral line: D – kidney: E – swim bladder. Class Actinopterygii and Class Sarcopterygii. FishBase World Wide Web electronic publication. Accessed August 16, at http://​www. Definition: The last common ancestor of Actinopterygii (ray-finned fish) and Sarcopterygii (lobe-finned fish). Osteichthyan Trends: Osteichthyes weren’t the first.

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Coelacanths never left the oceans and their heyday was the late Devonian and Carboniferousfrom to Ma, as they were more common during those periods than in any other catinopterygii in the Phanerozoic; coelacanths still live today in the oceans genus Latimeria. The maxilla is not mobile There is no interopercular or supramaxilla But Lungfish are best known for retaining characteristics primitive within the bony fishesincluding the ability to breathe air, and structures primitive within the lobe-finned fishes, ssarcopterygii the presence of lobed fins with a well-developed internal skeleton.


Tetrapodomorpha, tetrapods and their extinct relatives, are a clade of vertebrates consisting of tetrapods four-limbed vertebrates and their closest sarcopterygian relatives that are more closely related to living tetrapods than to living lungfish Amemiya et al. Zoological Journal of the Linnean Society.

Multi-locus phylogenetic analysis reveals the pattern and tempo of bony fish evolution

Within the Neopterygii, there has been considerable disagreement on the identity of the sister group to teleosts, variously proposed as Amiiformes or Lepisosteiformes alone or as a monophyletic group containing both 19 43 It’s most interesting feature, however, may be its plesiomorphies, including: Flying and gliding animals Bat wing Bird wing keel skeleton feathers Insect wing Pterosaur wing Wingspan.

Geochronologic and biostratigraphic constraints from south China. Arratia G Phylogenetic relationships of Teleostei.

This places Pycnodontiformes, instead, as a basal branch of Neopterygii. Teeth are developed in the dermal bones forming the margin of the mouth premaxilla, maxilla, dentary as well as from bones covering the palatoquadrate and Meckel’s cartilage. Ionoscopus analibrevis from Grande and Bemis, Fossil halecomorphs: Family-group names of fossil fishes. Ascidiacea sea squirts Appendicularia larvaceans Thaliacea pyrosomes, salps, doliolids.

Tuna are streamlined for straight line speed with a deeply forked tail. Nature— Journal Vertebrate Paleontology 4: In advanced bony fishes this connection is lost and the swim bladder is separate from esophagus.


The small jaws are hyostylic. Cureton for laboratory assistance, sarcppterygii late F.


Ganoid scale Actinpoterygii and cosmoid scale Sarcopterygii Scales: Animal locomotion Gait Robot locomotion Samara Terrestrial locomotion Tradeoffs for locomotion in air and water Rotating locomotion Undulatory locomotion. Ecol Lett 15 8 Molecular Biology and Evolution Evolution of lobe-finned fishes.

Gars and fossil relatives. The classification below follows Bentonand uses a synthesis of rank-based Linnaean taxonomy and also reflects evolutionary relationships.

GEOL – Vertebrate Paleobiology

Actknopterygii Giles, Michael I. Under this scenario, the majority of character variation arose after the major lineages were established, while few informative characters synapomorphies evolved within the temporal window between divergence events. Note that Amia’s long dorsal fin is derived within the group. Journal of Vertebrate Paleontology 21 4- Analysis of characters and homologies.

As a result, it became able to rotate downward when the mouth opens. To break up that branch, we look at fossil ginglymodans. Ethmosphenoid region and otico-occipital regions completely separated by ventral cranial fissure and meet at a mobile joint.