// Workers AI · dad joke modeWhat did Leptostyrax say? I'm pining to meet you.
| Leptostyrax Temporal range: | |
|---|---|
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Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Division: | Selachii |
| Order: | Lamniformes |
| Family: | †Pseudoscapanorhynchidae |
| Genus: | †Leptostyrax Williston, 1900[1] |
| Type species | |
| †Leptostyrax macrorhiza | |
| Other species | |
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| Synonyms | |
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Species synonymy
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Leptostyrax is an extinct genus of mackerel sharks that lived during the Cretaceous. It contains two valid species, L. macrorhiza and L. stychi, found in North America, Europe, Africa, and Australia.[3] It is among the earliest known lamniforms which underwent an adaptive radiation in the Early Cretaceous.[6]
Paleobiology
[edit]Leptostyrax is only known from isolated teeth. However, vertebrae tentatively assigned to L. macrorhiza suggest lengths of 6.3–8.3 m (21–27 ft), making it potentially one of the largest Cretaceous sharks.[7]
Leptostyrax had teeth similar to the modern sand tiger shark in having a tall, narrow primary cusp, and smaller secondary lateral cusps. This tearing type dentition suggests Leptostyrax preferred moderately large prey like bony fishes.[8]
References
[edit]- ↑ Williston, S.W. (1900). "Some fish teeth from the Kansas Cretaceous". Kansas University Quarterly. 9 (1): 27–42.
- ↑ 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.
- 1 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. Bibcode:2010NJGPA.257..283S. doi:10.1127/0077-7749/2010/0074.
- ↑ 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.
- ↑ Villalobos-Segura, Eduardo; Stumpf, Sebastian; Türtscher, Julia; Jambura, Patrick L.; Begat, Arnaud; López-Romero, Faviel A.; Fischer, Jan; Kriwet, Jürgen (2023-03-08). "A Synoptic Review of the Cartilaginous Fishes (Chondrichthyes: Holocephali, Elasmobranchii) from the Upper Jurassic Konservat-Lagerstätten of Southern Germany: Taxonomy, Diversity, and Faunal Relationships". Diversity. 15 (3): 386. Bibcode:2023Diver..15..386V. doi:10.3390/d15030386. ISSN 1424-2818. PMC 7614348. PMID 36950327.
- ↑ 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. Bibcode:2015PLoSO..1027162F. doi:10.1371/journal.pone.0127162. PMC 4454486. PMID 26039066.
- ↑ Mikael Siversson & Marcin Machalski (2017) Late late Albian (Early Cretaceous) shark teeth from Annopol, Poland, Alcheringa: An Australasian Journal of Palaeontology, 41:4, 433-463, DOI: 10.1080/03115518.2017.1282981
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