Scheenstia

Scheenstia
Temporal range: Late Jurassic–Early Cretaceous, 150–125 Ma
Fossil specimen of S. maximus
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Actinopterygii
Order:†Semionotiformes
Family:†Semionotidae
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 Cretaceous period. Fossils have been found in Bavaria, France, and England.

Life restoration of S. maximus

Scheenstia is frequently pictured as the prey of the large 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 Cretaceous species of that genus have since been re-classified as Scheenstia following detailed phylogenetic analysis.[1]

Classification

Scheenstia is a genus of lepisosteiform that 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

 

Luoxioingchthys

 
 

 

 

Notagogus

 
 

Macrosemius

 
 
 

Protopterus

 
 
 
 

Semionotidae

Semionotus

 
Callipurbeckiidae

 

Semiolepsis

 
 

 

Paralepidotus

 
 

 

Macrosemimimus

 
 

 

Tlayuamichin

 
 

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

 
 
 
 
 
 
 
 
Lepisoteiformes

 

Neosemionotus

 
 

 

 

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

 
 

Lepidotes

 
 
 

 

Isanichthys

 
 

Lepisosteoidei

 
 
 
 
 

References

  1. 1 2 3 López-Arbarello, A. (2012). "Phylogenetic Interrelationships of Ginglymodian Fishes (Actinopterygii: Neopterygii)". PLoS ONE. 7 (7): e39370. doi:10.1371/journal.pone.0039370. PMC 3394768. PMID 22808031.


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