Arthrodira

(redirected from Arthrodires)

Arthrodira

[‚är·thrō′dī·rə]
(paleontology)
The joint-necked fishes, an Upper Silurian and Devonian order of the Placodermi.
References in periodicals archive ?
The described specimens, especially the nuchal plates, clearly represent the genus Dunkleosteus and differ from other big arthrodires (after Lehman 1956, Denison 1978 and Dennis-Bryan 1987) in the emarginated posterior border of the skull roof, paranuchal plates extending back beyond the nuchal plate and showing a para-articular process, lack of dermal ornament, short, broad and triangular nuchal plate.
Les Arthrodires du devonien superieur du Tafialet (Sud Marocain).
The so-called 'Atholville Beds' (Dineley and Williams 1968), exposed at Campbellton and Atholville, have been examined by paleontologists since 1881 and have yielded ostracoderms, arthrodires, acanthodians and chondrichthyans (Whiteaves 1881, 1889; Woodward 1889, 1892; Traquair 1890, 1893).
Taxonomy of the arthrodire Phlyctaenius from the Lower or Middle Devonian of Campbellton, New Brunswick, Canada.
He said that their work earlier this year suggests the reproductive structure in the dominant group of placoderms, called arthrodires, was similar to present day sharks.
However, a closer inspection by Long and research team revealed they were the tiny bones of unborn fish from two adult species of arthrodires (Incisoscutum ritchiei) - the biggest and most diverse placoderm group.
No arthrodires had been known from the Khovanshchinian vertebrate localities of Central Russia before.
The postcranial bones of arthrodires PIN 2921/3267 (right posterior dorsolateral, PDL) and PIN 2921/3268 (an indeterminate fragment of the arthrodire dermal plate) were prepared manually.
The upper, Emsian part of the formation contains a quite different fish assemblage, consisting of placoderms--petalichthyid Wijdeaspis, buchnosteids, large arthrodires, e.
Hibernaspididae), cephalaspids, large arthrodires and sarcopterygians, show that the lowermost part of the Razvedochnyj Fm is exposed.
These are represented by species of arthrodires Coccosteus, Watsonosteus and Plourdosteus and antiarchs Asterolepis and Bothriolepis.