Hadrosteus is an extinct monospecific genus of large arthrodire placoderm from the Late Frasnian (Late Devonian) Kellwasserkalk facies of Bad Wildungen, Germany.[1] It had large, double-pronged inferognathals (lower jawbones), and serrated edges along its mandible, strongly suggesting that it was a fish-eating predator. The head had a triangular snout, and the trunkshield was short, but high, with a median dorsal plate that was broader than wide. The average skull length is about 16 centimeters.[1]
| Hadrosteus Temporal range: Late Devonian: Frasnian,
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| Artist's reconstruction | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Suborder: | †Brachythoraci |
| Clade: | †Eubrachythoraci |
| Clade: | †Pachyosteomorphi |
| Clade: | †Aspinothoracidi |
| Genus: | †Hadrosteus Gross, 1932 |
| Species | |
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Etymology
editThe type species Hadrosteus rapax means "Rapacious Strong-Bone".[1]
Phylogeny
editHadrosteus is a member of the clade Aspinothoracidi, which belongs to the clade Pachyosteomorphi, one of the two major clades within Eubrachythoraci. The cladogram below shows the phylogeny of Hadrosteus:[2]
References
edit- ^ a b c Denison, Robert (1978). Placodermi Volume 2 of Handbook of Paleoichthyology'. Stuttgart New York: Gustav Fischer Verlag. pp. 89–90. ISBN 978-0-89574-027-4.89-90&rft.pub=Gustav Fischer Verlag&rft.date=1978&rft.isbn=978-0-89574-027-4&rft.aulast=Denison&rft.aufirst=Robert&rfr_id=info:sid/en.wikipedia.org:Hadrosteus" class="Z3988">
- ^ Zhu, You-An; Zhu, Min; Wang, Jun-Qing (1 April 2016). "Redescription of Yinostius major (Arthrodira: Heterostiidae) from the Lower Devonian of China, and the interrelationships of Brachythoraci". Zoological Journal of the Linnean Society. 176 (4): 806–834. doi:10.1111/zoj.12356. ISSN 0024-4082.806-834&rft.date=2016-04-01&rft_id=info:doi/10.1111/zoj.12356&rft.issn=0024-4082&rft.aulast=Zhu&rft.aufirst=You-An&rft.au=Zhu, Min&rft.au=Wang, Jun-Qing&rft_id=https://doi.org/10.1111%2Fzoj.12356&rfr_id=info:sid/en.wikipedia.org:Hadrosteus" class="Z3988">
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