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.

Author: JoJogar Tesida
Country: Serbia
Language: English (Spanish)
Genre: Marketing
Published (Last): 24 May 2004
Pages: 272
PDF File Size: 1.51 Mb
ePub File Size: 9.74 Mb
ISBN: 976-7-87761-896-5
Downloads: 44179
Price: Free* [*Free Regsitration Required]
Uploader: Nikasa

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

A new stem-neopterygian fish from the Middle Triassic of China shows the earliest over-water gliding strategy of the vertebrates. Sensory canals in an Arthrodira and Osteichthyes.

An empirical search for interconnected patterns of natural history. See Giles srcopterygii al. Our estimate of Ma for divergence of crown Osteichthyes places the origin of Sarcopterygii and Actinopterygii in the Middle Silurian, with the sarcopterygian crown group evolving in the Early Devonian Ma and the actinopterygian crown group evolving at the Middle-Late boundary of the Devonian Ma.

Evolution of lobe-finned fishes. This is because in literature published prior acfinopterygii the s, such elements were named based on the similarity of their topographic position on the skull to the cranial elements of sarcopterygians, including tetrapods.


Examining fossil chondrosteans, one sees that this is a derived feature. Within the Neopterygii, there has been considerable disagreement on the identity of the sister group to teleosts, variously proposed as Amiiformes sarfopterygii Lepisosteiformes alone or as a monophyletic group containing both 19 43 Nested PCR was performed in successive reactions where a fold dilution of the first reaction sarcopterygiii used as template for the second reaction.

Didier Dutheil The first articulated fossil cladistian: Included large fish as well as small ones. Latimeria menadoensis Sarcopterygii and Xyrauchen texanus Actinopterygii.

There was a problem providing the content you requested

Then, in a thorough reassessment of the lepisosteiform morphology, Grande 46 provided evidence for resurrection of Holostei. Mimiapiscis toombsi Actinpoterygii and Eusthenopteron foordi Sarcopterygii Braincase: Cladistic Classification of Class Sarcopterygii.

The earliest known fossil actinopterygiian is Andreolepis hedeidating back million years Late Silurian. Jurassic – Quaternary Bowfins and their fossil relatives One extant species.

A new opercular element, the interopercular iop served to close the gap between the opercular series and jaw. Polypteriformes bichirsreedfishes. Proceedings Royal Society B OK Chordates All vertebrates are chordates but not all chordates are vertebrates. Hyoid arch cartilages ossify as: Lobe-finned fishes Temporal range: Ohio Geological Survey, Guidebook 22 Numbers in circles correspond to numbered descriptions in text below. Single exons were sequenced from each nuclear gene Table 1. I am interested in the origin and phylogenetic relationships of actinopterygians, especially teleostean fishes based on fossils acitnopterygii morphological, developmental, and molecuiar evidence of extant fishes.


Although they can remain out of water for considerable periods, they will drown if not given access to air.

Lists of prehistoric fish spiny sharks placoderms cartilaginous bony lobe-finned List of transitional fossils. Two replicate analyses were performed with BEAST, each run for million generations, with the topology constrained to that recovered in phylogenetic analyses. The lungfish evolved the first proto-lungs and proto-limbs; developing the ability to live outside a water environment in the middle Devonian — Sarcopferygii. Proceedings of the National Academy of Sciences.

Near and Matt Friedman Early members of ‘living fossil’ lineage imply later origin of modern ray-finned fishes. Link to skull of Mimiapiscis in palatal view.

GEOL – Vertebrate Paleobiology

Postorbital process forms the dorsal surface of a partition called the lateral commisure. Ganoid scale Actinpoterygii and cosmoid scale Sarcopterygii.

Pre- and postaxial elements branch from a metapterygial axis.

The first phylogenetic analyses found it to be paraphyletic, however during the last decade, this “ancient fish clade” has experienced a resurgence in phylogenetic analyses. Non-tetrapod sarcopterygians continued until towards the end of Paleozoic era, suffering heavy losses during the Permian-Triassic extinction event Ma.

This huge radiation seems to have resulted from signifcant morphological adaptations beginning with: Persistent Ventral cranial fissure in floor of braincase between otic parachordal and sphenoid trabecular regions.