| 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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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]
Etymology
The type species Hadrosteus rapax means "Rapacious Strong-Bone". [1]
Phylogeny
Hadrosteus 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
- ^ 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.
- ^ 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.
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