Results 121 to 130 of about 387 (155)

Histological structure of the cancellous bone layer in Bothriolepis canadensis (Antiarchi, Placodermi)

Lethaia, 2005
The Placodermi are extinct basal gnathostomes which had extensive dermal and perichondral bone, but which lacked the endochondral bone which characterizes the more derived bony fishes.
Carole J. Burrow
exaly   +6 more sources

Subclass Placodermi

, 1971
J. A. Moy-Thomas
exaly   +3 more sources

Bothriolepiform antiarchs (Pisces, Placodermi) from the devonian of Central Kazakhstan

Paleontological Journal, 2011
Bothriolepiform antiarchs (Placodermi, Antiarchi) are represented by two genera in the Devonian of Central Kazakhstan: Bothriolepis Eichwald (Bothriolepididae) and Tenizolepis Malinovskaja (Dianolepididae). The first includes five species: B. babichevi Malinovskaja, 1992, B. kassini Malinovskaja, 1988, B. amankonyrica Malinovskaja, 1988, B.
S V Moloshnikov
exaly   +3 more sources

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Dinichthyidae (Placodermi):A paleontological fiction?

Geobios, 1995
Abstract Dinichthyidae has historically been a repository for a number of large pachyosteomorph arthrodires with questionsraised on several occasions concerning the validity of this family. A cladistic analysis of dinichthyid arthrodires results in a revision of basal pachyosteomorph arthrodires.
Robert K. Carr, William J. Hlavin
exaly   +2 more sources

Late Devonian Bothriolepidids (Placodermi, Antiarchi) of the Tver Oblast

Paleontological Journal, 2020
The species Livnolepis heckeri (Luksevics, 2001) which had been assigned to the genus Bothriolepis at first description, was described from the Famennian sediments (Upper Devonian) of the Tver oblast. New materials collected from a type locality near the village of Bilovo enabled considerable expansion of the morphological description of the species ...
S. V. Moloshnikov, V. V. Linkevich
openaire   +1 more source

Vascularization of the osteostracan and antiarch (Placodermi) pectoral fin: similarities, and implications for placoderm relationships

Lethaia, 2002
Phylogenetic analyses frequently resolve the extinct group Placodermi at the base of the clade of jawed fishes (traditionally known as the Gnathostomata), with the jawless fish group Osteostraci as sister taxon to this clade. Both gnathostomes and osteostracans possess pectoral fins supported by a radial(s) articulating on a cartilaginous ...
Zerina Johanson
exaly   +2 more sources

New morphological information on the ptyctodontid fishes (Placodermi, Ptyctodontida) from Western Australia

Journal of Vertebrate Paleontology, 2012
ABSTRACT A full description of a complete and articulated, three-dimensionally preserved, placoderm fish, Materpiscis attenboroughi (Ptyctodontida), from the Late Devonian Gogo Formation is presented. The jaw articulation is unique in being preserved in situ, providing new morphological information on the articulation of the quadrate, metapterygoid ...
Tim J. Senden, John A. Long, Kate Trinajstic   +2 more
exaly   +3 more sources

On the status of species ofBothriolepis(Placodermi, Antiarchi) in North America

Journal of Vertebrate Paleontology, 2001
ABSTRACT Based on new material collected from the Upper Devonian, “Catskill Formation” of Pennsylvania, and a comparison with variation in Bothriolepis canadensis and B. yeungae, it is suggested that the species Bothriolepis minor, B. virginiensis, B. coloradensis, and B.
Keith Stewart Thomson, Bethia Thomas
openaire   +1 more source

Further consideration of the phylogeny and classification of the order Arthrodira (Pisces: Placodermi)

Journal of Vertebrate Paleontology, 1984
ABSTRACT Evaluation of the characters used to determine the phylogeny and classification of arthrodires leads to the following conclusions: Actinolepidae are defined only by characters primitive for the order. Holonematidae are not brachythoracans but are related to Phlyctaeniidae.
openaire   +1 more source

The occipital-synarcual complex in Nefudina qalibahensis (Placodermi)

Journal of Vertebrate Paleontology, 2009
International ...
Lelièvre, H., Carr, R.K.
exaly   +1 more source