Acanthodii

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Acanthodii

[ə‚kan′thō·dē‚ī]
(paleontology)
A class of extinct fusiform fishes, the first jaw-bearing vertebrates in the fossil record.
References in periodicals archive ?
Tiiu Marss pointed out that the lower part of the Pridoli (Kaugatuma and Minija fms, see also Karatajute-Talimaa 1978) is richly dominated by acanthodians, but different heterostracans become important in the upper half.
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.
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.
Pander in 1856, who described shields of the heterostracan Tolypelepis undulata, plates of the osteichthyan Lophosteus superbus and a number of jaw bones of acanthodians (Pander 1856).
These previously discovered eurypterids are from the western exposure of the Campbellton Formation and are believed to have inhabited a coastal deltaic setting, along with a rich vertebrate assemblage that included cephalaspids, placoderms, acanthodians, and sharks.
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.
However, the acanthodians, thelodonts and osteostracans from the majority of the Gotland stratigraphy are still in need of taxonomic review and revision.
Before this discovery, most scientists believed that the braincases of Acanthodians resembled those of bony fish, and were thus related to this type of animal.