Leptostyrax

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]

Leptostyrax
Temporal range:
Leptostyrax macrorhiza
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Lamniformes
Family: †Pseudoscapanorhynchidae
Genus: †Leptostyrax
Williston, 1900[1]
Type species
†Leptostyrax macrorhiza
(Cope, 1875)[2]
Other species
  • †Leptostyrax stychi
    Schmitz, Thies, & Kriwet, 2010[3]
Synonyms
Genus synonymy
    • Macrorhizodon
      Sokolov, 1965[4]
    • Megarhizodon
      Sokolov, 1978[5]
Species synonymy
  • L. macrorhiza
      • Lamna macrorhiza
        Cope, 1875
      • Leptostyrax bicuspidatus
        Williston, 1900
      • Megarhizodon priscus
        Sokolov, 1978

Vertebrae, possibly belonging to L. macrorhiza reached lengths of 6.3–8.3 m (21–27 ft), making it one of the largest Cretaceous sharks.[6]

References
  1. Williston, S.W. (1900). "Some fish teeth from the Kansas Cretaceous". Kansas University Quarterly. 9 (1): 27–42.
  2. 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.
  3. 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.
  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.
  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.
  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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