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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Anterior of dorsal and anal fins reinforced by narrow parallel radials right.

Fossil polypteriforms are only known from two Godwanan continents, South America and Africa; the oldest records are from the Albian of Brazil to 99 Ma [7] and the Cenomanian of Morocco Kem Kem beds, Cenomanian [30, 31]. I am a biologist specialized in ichthyology and ichthyopaleontology.

The first million years.

Actinopterygii

Hard lower bounds or minimum age reflect the youngest possible age interpretation of the fossils, rather than mid-point of age range see [1] ; soft upper bounds or actinoptegygii age reflect the oldest possible fossil age.

Evolution of lobe-finned fishes. This article has been cited by other articles in PMC.

actinopterjgii Cenomanian Upper CretaceousHakel, Lebanon. Prehistoric life Transitional fossils Vertebrate paleontology.

Fieldiana, Geology 17 4 Pectoral and pelvic fins have articulations resembling those actinoptergyii tetrapod limbs. Prehistoric life Transitional fossils Vertebrate paleontology. Osteoglossomorpha bony tongues, mooneyes and elephantfishesElopomorpha tarpons, bonefishes, eels and relativesOtomorpha a large group containing Clupeiformes [shads and herrings] plus Ostariophysi including [minnows, catfishes, characins and relatives]and Euteleosteomorpha all remaining teleosts Although the sister group relationship of Sarcopterygii and Actinopterygii is not controversial, the hypothesis that Cladistia including Polypteriformes is included in Actinopterygii has not been rigorously tested.

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The fourth hypothesis is that there was less competition for prey, more safety from predators, climate reasons such as oxygen concentration Carroll actniopterygii al.

Bulletin of the American Museum of Natural History An evidence of their high diversity in the early Late Cretaceous. Deep bodies Longish snouts full of teeth specialized for crushing, and front incisors for nipping Body scales reduced to long bars on the front half of the body. Click for comparison with ancestral halecomorph.

The maxilla shortened and became detached from other bones of the skull roof, acquiring a new anterior peg-and-socket articulation with the palatoquadrate. The sister group relationship between Sarcopterygii and Actinopterygii is well established.

Sarcopterygii – Wikipedia

Cosmoid scales Typically lack ganoine although the most basal members have it. Reproductive Biology of Teleost Fishes. Black circles indicate crown calibrations; white circles indicate stem calibrations. CaCO 3 structures that fill the sacculus or utricle of the inner ear.

Traditionally considered close to Teleostei, the only phylogenetic analysis to address their position is that of Poyato-Ariza, Cheirolepis canadensis Cheirolepididae Middle-Late Devonian – The most basal well-known fossil actinopterygians, and a close approximation of what we would expect from the true last common ancestor of the group.

John Maisey and M. In other projects Wikimedia Commons Wikispecies. Many duplicated genes appear to have arisen in the ancestor of teleosts, suggesting a whole-genome duplication in that lineage 1 2.

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

This page was last edited on 23 Decemberat There are only few changes during their evolution from the earlier actinopterygians. This is a very unusual condition for fish vertebrae and makes even fragmentary fossil gars readily identifiable.

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The Tetrapodomorpha contain the crown group tetrapods the last common ancestor of living tetrapods and all of its descendants and several groups of early stem tetrapodsand several groups of related lobe-finned fishes, collectively known as the osteolepiforms.

Systematics sarcopterrygii Fossil Record. Within teleosts, our results place Elopomorpha as the earliest branching lineage among the teleosts, Osteoglossomorpha as the sister group to Sarco;terygii. Polypteriformes bichirsreedfishes. In Fossil Record II ed.

Actinopterygii – Wikipedia

Version 01 January under construction. Dermal bones of the jaw: Late Cretaceous Grandstaff et al. Cybium 6 Journal of Molecular Evolution Lobe-finned actinoptsrygii sarcopterygians and their relatives the ray-finned fishes actinopterygians comprise the superclass of bony fishes Osteichthyes characterized by their bony skeleton rather than cartilage.

BMC Evolutionary Biology 7: Schultze HP TL, editor. Their evolution will be addressed in detail. Broughton, University of Oklahoma. Evolution of fish Evolution of tetrapods Evolution of birds Origin of birds Sarcoptrygii of avian flight Evolution of cetaceans Comparative anatomy Convergent evolution Analogous structures Homologous structures. Ray-finned fish Sagcopterygii range: Redfieldius gracilis The comparison of Moythomasia Late Devonian a basal member of this radiation, and Redfieldius Triassic – right a more derived member shows that Redfieldius displays a condition closer to that of derived actinopterygians in most of these features.