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Actinopterygii (/ ˌ æ k t ɪ n ɒ p t ə ˈ r ɪ dʒ i aɪ /; from actino- 'having rays' and Ancient Greek πτέρυξ (ptérux) 'wing, fins'), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish [2] that comprise over 50% of living vertebrate species. [3]
Evolution of ray-finned fishes, Actinopterygii, from the Devonian to the present as a spindle diagram. The width of the spindles are proportional to the number of families as a rough estimate of diversity. The diagram is based on Benton, M. J. (2005) Vertebrate Palaeontology, Blackwell, 3rd edition, Fig 7.13 on page 185.
Actinopteri (/ æ k t ɪ ˈ n ɒ p t ə r aɪ /) is the sister group of Cladistia in the class Actinopterygii (ray-finned fish). Dating back to the Permian period, the Actinopteri comprise the Chondrostei (sturgeons and paddlefish), the Holostei (bowfins and gars), and the teleosts; in other words, all extant ray-finned fish other than the bichirs.
The oldest unambiguous members of the order are the Chondrosteidae, a group of large fish found in marine deposits from the Early Jurassic (201–175 million years ago) of Europe, which already have reduced ossification of the skeleton. [11] The Peipiaosteidae are known from Middle Jurassic-Early Cretaceous freshwater deposits in Asia. [12]
Download as PDF; Printable version; ... Actinopterygii: Order: Perciformes: Suborder: ... This reduced ossification of the skeleton (observed in some notothenioids ...
Fossil of Chondrosteus acipenseroides from Lyme Regis Strongylosteus hindenburgi fossil from Posidonia Shale, Staatliches Museum für Naturkunde Stuttgart. Chondrosteidae / ˌ k ɒ n d r oʊ s t i ˈ aɪ d iː / is a family of extinct marine actinopterygian fishes, known from the Early Jurassic of Europe.
Fish portal; Holostei is a group of ray-finned bony fish.It is divided into two major clades, the Halecomorphi, represented by the single living genus, Amia with two species, the bowfins (Amia calva and Amia ocellicauda), as well as the Ginglymodi, the sole living representatives being the gars (Lepisosteidae), represented by seven living species in two genera (Atractosteus, Lepisosteus). [3]
Several synapomorphies support this hypothesis, such as the presence of: sclerotic ossicles, paired pectoral fins, a dermal skeleton with three layers (a basal layer of isopedin, a middle layer of spongy bone, and a superficial layer of dentin), and perichondral bone. [10] Other groups Other groups † Pteraspido-morphi (extinct)