Acanthodii

(redirected from Acanthodians)
Also found in: Encyclopedia.

Acanthodii

an order of placoderm fossil fish, whose members bear spines along the anterior margin of the fins.
References in periodicals archive ?
However, by the Eday Flagstone Formation, acanthodians have become extinct in the Orcadian Basin.
adentatus represented a transition in evolution from the extinct bony fish group called the acanthodians to the cartilaginous ones called the chondrichthyes that are still around today; it is one of the links that connects the two.
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).
Coates and colleagues Samuel Davis and John Finarelli found answers to this mystery in an unexpected place: the acanthodians, extinct fishes that generally left behind only tiny scales and elaborate suites of fin spines.
Acanthodians and zonal stratigraphy of Lower and Middle Devonian in East Baltic and Byelorussia // Palaeontographica, Abt.
Cladoselache, Tristychius, Ctenacanthus, Paleospinax, Spathobatis, Protospinax, Acanthodians, Cheirolepis, Mimia, Canobius, Aeduella, Parasemionotus, Oreochima, Leptolepis, Osteolepis, Eusthenopteron, Sterropterygion, Panderichthys, Elpistostege, Hynerpeton, Acanthostega, Ichthyostega, Pholidogaster, Pteroplax, Dendrerpeton acadianum, Archegosaurus decheni, Eryops megacephalus, Trematops, Amphibamus lyelli, Doleserpeton annectens, Triadobatrachus, Vieraella, Karaurus, Proterogyrinus, Limnoscelis, Tseajaia, Solenodonsaurus, Hylonomus, Paleothyris, Captorhinus, Scutosaurus, Deltavjatia vjatkensis, Proganochelys, Hylonomus, Paleothyris, Petrol- acosaurus, Araeoscelis, Apsisaurus, Claudiosaurus, Planocephalosaurus, Protorosaurus, Prolacerta, Proterosuchus, Hyperodapedon, Trilopho- saurus.
birkeniid anaspids, acanthodians Nostolepis striata Pander, Gomphonchus sandelensis (Pander), and Gomphonchus hoppei (Gross), and a taxon that has similarities with Thelodus parvidens Agassiz.
The excretions contain material from two types of fish: acanthodians, which had several long, protruding spines; and palaeoniscoids, which lack external spines.
The Andreyevka-2 community including antiarch placoderms, acanthodians, chondrichthyans and osteichthyans, as well as tetrapods, has been discussed on repeated occasions by the first author of this paper (Lebedev 1986, 1992, 2013; Lebedev et al.
Joined by Romer in the second week, they found an amazing quantity of fossil vertebrate remains --significant material of acanthodians, arthrodirans, chondrichthyans, dipnoans, and tetrapodomorph fishes --but it was marine in origin and did not include any tetrapod fossils.
Stephanie Blais and her colleagues from the Department of Biological Sciences at the University of Alberta studied animals called ischnacanthid acanthodians, an extinct group of fish that resembled sharks.
Remains of psammosteid heterostracans and acanthodians are very diverse and abundant in the Middle and Upper Devonian (Eifelian, Givetian and Frasnian stages) of the Baltic area, i.