Scheenstia

Scheenstia; Temporal range: Late Jurassic–Early Cretaceous,
	Fossil specimen of S. maxima
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Lepisosteiformes
Family:	†Lepidotidae
Genus:	†Scheenstia; López-Arbarello & Sferco, 2011
Type species
	Scheenstia zappi; López-Arbarello & Sferco, 2011
Species[1]
	†S. mantelli (Agassiz, 1833); †S. laevis (Agassiz, 1837); †S. maximus (Wagner, 1863); †S. decoratus (Wagner, 1863); †S. degenhardti (Branco, 1885); †S. hauchecornei (Wagner, 1863); †S. zappi López-Arbarello & Sferco, 2011

Scheenstia is an extinct genus of neopterygian ray-finned fish from the Late Jurassic–Early Cretaceous periods. Fossils have been found in Bavaria, France, and England.

Life restoration of S. maxima

Scheenstia is frequently pictured as the prey of the dinosaur Baryonyx walkeri because the scales and teeth of these fish were found in the stomach region of a fossil B. walkeri specimen. The fish remains were previously referred to the related genus Lepidotes, but all Late Jurassic–Early Cretaceous species of that genus have since been re-classified as Scheenstia following detailed phylogenetic analysis.[1] It is a member of Lepisosteiformes meaning that is closest living relates are gars.

Classification

Scheenstia is related to the genus Lepidotes. The latter has been one of the greatest actinopterygian wastebasket taxa, with one 2012 study finding species referrable to a minimum of three different and distantly related genera. Scheenstia is also related to Isanichthys. A cladogram showing the relations of Neopterygii was published in the review, and a simplified version labelling the previous species of Lepidotes is shown here.[1]

Ginglymodi

Semionotiformes

Sangiorgioichthys

Macrosemiidae

Luoxiongchthys

	Notagogus

	Macrosemius

Semiolepsis

	Tlayuamichin

	Callipurbeckia (incl. L. minor, L. notopterus, L. tendagurensis)

Lepisosteiformes

Neosemionotus

	Scheenstia (incl. L. mantelli, L. laevis, L. maximus, L. decoratus, L. degenhardti, L. hauchecorni)

	Lepidotes

	Isanichthys

	Lepisosteoidei

References

López-Arbarello, A. (2012). "Phylogenetic Interrelationships of Ginglymodian Fishes (Actinopterygii: Neopterygii)". PLOS ONE. 7 (7): e39370. Bibcode:2012PLoSO...739370L. doi:10.1371/journal.pone.0039370. PMC 3394768. PMID 22808031.

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[lopez2012-1] López-Arbarello, A. (2012). "Phylogenetic Interrelationships of Ginglymodian Fishes (Actinopterygii: Neopterygii)". PLOS ONE. 7 (7): e39370. Bibcode:2012PLoSO...739370L. doi:10.1371/journal.pone.0039370. PMC 3394768. PMID 22808031.