Gyrosteus

Gyrosteus; Temporal range: Lower Toarcian 181 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Reconstruction of Gyrosteus mirabilis
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Chondrosteiformes
Family:	Chondrosteidae
Genus:	Gyrosteus; Agassiz, 1843
Species
	Gyrosteus mirabilis[1] Agassiz 1844; "Gyrosteus" subdeltoideus[2] Stinton & Torrens 1967;

Gyrosteus mirabilis is an extinct large ray-finned fish of the family Chondrosteidae that lived during the Jurassic. It´s fossils have been recovered on the Whitby Mudstone Formation, United Kingdom and on Ahrensburg erratics assemblage on Schleswig-Holstein, northern Germany.[3] It was mentioned but not formally described in subsequent publications and was left as a nomen dudum for mora than 25 years.[4] Then in 1889 was featured and formally described.[5] The members of this genus where massive fishes, with a maximum calculated standard length of six to seven meters, and with a reported hyomandibula reaching 50 cm.[6] This genus was tougth to be exclusive of the “British faunal province” and separated from the “Germanic faunal province” until the find of an hyomandibula on the baltic realm, mostly populated by Germanic fauna, what can implicate that Baltic region may represent an interdigitating zone between both.[3]

References

Agassiz L. 1834. Recherches sur les Poissons Fossiles: Tome I. Neuchatel: Imprimerie de Petitpierre. 188
Stinton FC, Torrens HS. 1968. Fish otoliths from the Bathonian of southern England. Palaeontology 11(2):246-258
Hornung, J. J., & Sachs, S. (2020). First record of Gyrosteus mirabilis (Actinopterygii, Chondrosteidae) from the Toarcian (Lower Jurassic) of the Baltic region. PeerJ, 8, e8400.
Egerton, P. G., & Cole, E. W. W. (1837). A Systematic and Stratigraphical Catalogue of the Fossil Fish in the Cabinets of Lord Cole and Sir Philip Grey Egerton: Together with an Alphabetical and Stratigraphical Catalogue of the Same Species, with References to Their Published Figures and Descriptions. Richard and John E. Taylor.
Woodward, A. S. (1889). On the pal˦ ontology of sturgeons. Proceedings of the Geologists' Association, 11(1), 24-32.
Woodward AS. 1890. The fossil sturgeon of the Whitby Lias. Naturalist 15(177):101-107

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[1] Agassiz L. 1834. Recherches sur les Poissons Fossiles: Tome I. Neuchatel: Imprimerie de Petitpierre. 188

[2] Stinton FC, Torrens HS. 1968. Fish otoliths from the Bathonian of southern England. Palaeontology 11(2):246-258

[Baltic-3] Hornung, J. J., & Sachs, S. (2020). First record of Gyrosteus mirabilis (Actinopterygii, Chondrosteidae) from the Toarcian (Lower Jurassic) of the Baltic region. PeerJ, 8, e8400.

[pdb-4] Egerton, P. G., & Cole, E. W. W. (1837). A Systematic and Stratigraphical Catalogue of the Fossil Fish in the Cabinets of Lord Cole and Sir Philip Grey Egerton: Together with an Alphabetical and Stratigraphical Catalogue of the Same Species, with References to Their Published Figures and Descriptions. Richard and John E. Taylor.

[5] Woodward, A. S. (1889). On the pal˦ ontology of sturgeons. Proceedings of the Geologists' Association, 11(1), 24-32.

[6] Woodward AS. 1890. The fossil sturgeon of the Whitby Lias. Naturalist 15(177):101-107