Leptostyrax

Leptostyrax; Temporal range: Barremian-Campanian PreꞒ Ꞓ O S D C P T J K Pg N
	Leptostyrax macrorhiza
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	Lamniformes
Family:	†Pseudoscapanorhynchidae
Genus:	†Leptostyrax; Williston, 1900
Type species
	†Leptostyrax macrorhiza; (Cope, 1875)
Other species
	†Leptostyrax stychi ; Schmitz, Thies, & Kriwet, 2010;
Synonyms
	Genus synonymy Macrorhizodon ; Sokolov, 1965; Megarhizodon ; Sokolov, 1978; ; Species synonymy L. macrorhiza Lamna macrorhiza ; Cope, 1875; Leptostyrax bicuspidatus ; Williston, 1900; Megarhizodon priscus ; Sokolov, 1978; ; ;

Leptostyrax is an extinct genus of mackerel sharks that lived during the Cretaceous. It contains two valid species, L. macrorhiza and L. stychi, which have been found in North America, Europe, Africa, and Australia.^[2] Vertebrae possibly belonging to L. macrorhiza suggest it reached lengths of 6.3–8.3 m (21–27 ft), making it one of the largest Cretaceous sharks.^[6]

References

^ Williston, S.W. (1900). "Some fish teeth from the Kansas Cretaceous". Kansas University Quarterly. 9 (1): 27–42.
^ ^a ^b Schmitz, L.; Thies, D.; Kriwet, J. (2010). "Two new lamniform sharks (Leptostyrax stychi sp. nov. and Protolamna sarstedtensis sp. nov.) from the Early Cretaceous of NW Germany". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 257 (3): 283–296. doi:10.1127/0077-7749/2010/0074.
^ Cope, E.D. (1875). The Vertebrata of the Cretaceous Formations of the West. Washington, DC: United States Government Printing Office. doi:10.5962/bhl.title.61834.
^ Sokolov, M.I. (1965). "Evolyutsiya zubov nekotorykh melovykh akul i rekonstruktsiya ikh ozubleniya [Evolution of the teeth of some Cretaceous sharks and reconstruction of their dentition]". Moskovkoe Obshchestvo Ispytatelie Prirody, Bulletin, Otodel Geologicheskii. 40: 133–134.
^ Sokolov, M.I. (1978). Zuby akul kak rukovodyashchiye iskopayemyye pri zonalʹnom raschlenenii melovykh otlozheniy Turanskoy plity [Shark teeth as guiding fossils in the zonal division of the Cretaceous deposits of the Turan Plate]. Moscow: Nedra.
^ Frederickson, J.A.; Schaefer, S.N.; Doucette-Frederickson, J.A. (2015). "A gigantic shark from the Lower Cretaceous Duck Creek Formation of Texas". PLoS ONE. 10 (6): e0127162. doi:10.1371/journal.pone.0127162.

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[Williston_1900-1] Williston, S.W. (1900). "Some fish teeth from the Kansas Cretaceous". Kansas University Quarterly. 9 (1): 27–42.

[Schmitz_et_al._2010-2] Schmitz, L.; Thies, D.; Kriwet, J. (2010). "Two new lamniform sharks (Leptostyrax stychi sp. nov. and Protolamna sarstedtensis sp. nov.) from the Early Cretaceous of NW Germany". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 257 (3): 283–296. doi:10.1127/0077-7749/2010/0074.

[Cope_1875-3] Cope, E.D. (1875). The Vertebrata of the Cretaceous Formations of the West. Washington, DC: United States Government Printing Office. doi:10.5962/bhl.title.61834.

[Sokolov_1965-4] Sokolov, M.I. (1965). "Evolyutsiya zubov nekotorykh melovykh akul i rekonstruktsiya ikh ozubleniya [Evolution of the teeth of some Cretaceous sharks and reconstruction of their dentition]". Moskovkoe Obshchestvo Ispytatelie Prirody, Bulletin, Otodel Geologicheskii. 40: 133–134.

[Sokolov_1978-5] Sokolov, M.I. (1978). Zuby akul kak rukovodyashchiye iskopayemyye pri zonalʹnom raschlenenii melovykh otlozheniy Turanskoy plity [Shark teeth as guiding fossils in the zonal division of the Cretaceous deposits of the Turan Plate]. Moscow: Nedra.

[Frederickson_et_al._2015-6] Frederickson, J.A.; Schaefer, S.N.; Doucette-Frederickson, J.A. (2015). "A gigantic shark from the Lower Cretaceous Duck Creek Formation of Texas". PLoS ONE. 10 (6): e0127162. doi:10.1371/journal.pone.0127162.

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