Gymnotrachelus is an extinct monospecific genus of large selenosteid arthrodire placoderm of the Late Devonian known from the Late Famennian Cleveland Shale of Ohio.[1] The type species is Gymnotrachelus hydei.[2]
| Gymnotrachelus Temporal range: Late Devonian: Famennian,
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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 |
| Family: | †Selenosteidae |
| Genus: | †Gymnotrachelus Dunkel & Bungart, 1939 |
| Species | |
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Phylogeny
editGymnotrachelus is a member of the family Selenosteidae 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 Gymnotrachelus:[3]
According to a 2022 Jobbins et al. study, Gymnotrachelus was found to be an outgroup to Heintzichthys and Gorgonichthys.[4]
References
edit- ^ Denison, Robert (1978). Handbook of Paleoichthyology, Volume 2, Placodermi. New York: Gustav Fischer Verlage. p. 96. ISBN 9780895740274.
- ^ Carr, Robert (1994). "A redescription of Gymnotrachelus hydei (Placodermi : Arthrodira) from the Cleveland Shale (Famennian) of north2 ern Ohio, U. S. A." (PDF). Kirtlandia (48): 3–21.
- ^ 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.
- ^ Jobbins, Melina; Rücklin, Martin; Ferrón, Humberto G.; Klug, Christian (2022). "A new selenosteid placoderm from the Late Devonian of the eastern Anti-Atlas (Morocco) with preserved body outline and its ecomorphology". Frontiers in Ecology and Evolution. 10. doi:10.3389/fevo.2022.969158. hdl:10550/85583. ISSN 2296-701X.
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