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Diplognathus Temporal range: Late Famennian
Reconstructed as hadrosteids
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Placodermi
Order:	Arthrodira
Suborder:	Brachythoraci
Infraorder:	Coccosteina
Superfamily:	Dinichthyloidea
Family:	?Hadrosteidae
Genus:	Diplognathus Newberry, 1878
Type species
Diplognathus mirabilis Newberry, 1878
Species
D. mirabilis Newberry, 1878 D. larfargei Carr, 2005

Diplognathus is a genus of arthrodire placoderm from the Late Famennian Cleveland Shale of Late Devonian Ohio, known only from incomplete fragments of jaws and skulls. What fragments are known suggest that the living animals were large-eyed piscivores with weak, but widely gaping jaws. D. mirabilis is thought to be fairly large, with infragnathals up to 45 centimeters in length. The second species, D. larfargei, was much smaller, with inferognathals averaging about 4 centimeters in length.

In 1967, Obruchev placed this genus within Hadrosteidae, on the basis of how the two genera have similar denticle ("teeth") patterns of the inferognathals, though Denison (1978) contested this placement, preferring to leave the taxon as Arthrodira incertae sedis.

References

1. Denison, Robert (1978). Placodermi Volume 2 of Handbook of Paleoichthyology. Stuttgart New York: Gustav Fischer Verlag. p. 105. ISBN 978-0-89574-027-4.
2. CARR, ROBERT K.; GARY L. JACKSON (2005). "Diplognathus lafargei sp. nov . From the Antrim Shale (Upper Devonian) of the Michigan Basin, Michigan, U.S.A." (PDF). Revista Brasileira de Paleontologia. 8 (2): 019–116 (113). doi:10.4072/rbp.2005.2.03.

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Kingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Infraphylum: Gnathostomata Gnathostomata see Gnathostomata Placodermi see below↓ Placodermi
Acanthothoraci* Hagiangella Palaeacanthaspidae* Arabosteus Dobrowlania Kimaspis Kolymaspis Kosoraspis Palaeacanthaspis Radotina Romundina Sudaspis Tlamaspis Weejasperaspididae Murrindalaspis Weejasperaspis Petalichthyida Diandongpetalichthys Neopetalichthys Quasipetalichthyidae Eurycaraspis Pauropetalichthys Quasipetalichthys Macropetalichthyidae Ellopetalichthys Epipetalichthys Lunaspis Macropetalichthys Notopetalichthys Shearsbyaspis Tongdzuylepis Wijdeaspis Ptyctodontida Austroptyctodus Campbellodus Chelyophorus Ctenurella Denisonodus Destnoporella Eczematolepis Goniosteus Kimbryanodus Materpiscis Meeksiella Palaeomylus Ptyctodopsis Ptyctodus Rhamphodopsis Rhynchodus Rhenanida Asterosteus Bolivosteus Gemuendina Jagorina Nefudina Ohioaspis Antiarchi see Antiarchi Arthrodira see Arthrodira Others "maxillate placoderms" Bianchengichthys Entelognathus Qilinyu Silurolepis? Brindabellaspis Holopetalichthys Minjinia Pseudopetalichthys Stensioella Xiushanosteus
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• Enigmatic arthrodire taxa
• Placoderms of North America
• Fossil taxa described in 1878
• Paleontology in Ohio
• Famennian life
• Famennian genus first appearances
• Famennian genus extinctions
• Placoderm stubs