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definition - Actinopterygii

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Actinopterygii

                   
Ray-finned fish
Temporal range: Late Silurian–Recent
Pg
Atlantic herring
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Superclass*: Osteichthyes
Class: Actinopterygii
Klein,1885
Subclasses

The Actinopterygii (play /ˌæktɨnɒptəˈrɪi./), or ray-finned fishes, constitute a class or sub-class of the bony fishes.

The ray-finned fishes are so called because they possess lepidotrichia or "fin rays", their fins being webs of skin supported by bony or horny spines ("rays"), as opposed to the fleshy, lobed fins that characterize the class Sarcopterygii which also, however, possess lepidotrichia. These actinopterygian fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the link or connection between these fins and the internal skeleton (e.g., pelvic and pectoral girdles).

In terms of numbers, actinopterygians are the dominant class of vertebrates, comprising nearly 96% of the 25,000 species of fish (Davis, Brian 2010). They are ubiquitous throughout fresh water and marine environments from the deep sea to the highest mountain streams. Extant species can range in size from Paedocypris, at 8 millimetres (0.31 in), to the massive Ocean Sunfish, at 2,300 kilograms (5,100 lb), and the long-bodied Oarfish, to at least 11 metres (36 ft).

Contents

  Fossil record

  Hypsospondylus fossil

The earliest known fossil Actinopterygiian is Andreolepis hedei, dating back 420 million years (Late Silurian). This microvertebrate has been uncovered in Russia, Sweden, and Estonia.[1]

  Classification

Traditionally three grades of actinopterygians have been recognised: the Chondrostei, Holostei, and Teleostei. Some morphological evidence suggests that the second is paraphyletic and should be abandoned; however, recent work based on of orders, arranged in what has been suggested to represent the evolutionary sequence down to the level of order based primarily on the long history of morphological studies. This classification, like any other taxonomy based on phylogenetic research is in a state of flux. Recent morphological and molecular data has shown that several of these ordinal and higher-level groupings represent evolutionary grades rather than clades. Examples of demonstrably paraphyletic groups include the Paracanthopterygii, Scorpaeniformes, and Perciformes.[2] The listing follows FishBase[3] with notes when this differs from Nelson[4] and ITIS.[5]

  Notes

  1. ^ Palaeobase
  2. ^ G. D. Johnson and E. O. Wiley (March 2007). "Tree of Life: Percomorpha". http://www.tolweb.org/Percomorpha/52146. 
  3. ^ R. Froese and D. Pauly (editors) (February 2006). "FishBase". http://www.fishbase.org. 
  4. ^ Nelson, Joseph, S. (2006). Fishes of the World. John Wiley & Sons, Inc.. ISBN 0-471-25031-7. 
  5. ^ "Actinopterygii". Integrated Taxonomic Information System. http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=161061. Retrieved 3 April 2006. 
  6. ^ In Nelson, Polypteriformes is placed in its own subclass Cladistia.
  7. ^ In ITIS, Gobiesociformes is placed as the suborder Gobiesocoidei of the order Perciformes.
  8. ^ In Nelson and ITIS, Syngnathiformes is placed as the suborder Syngnathoidei of the order Gasterosteiformes.

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