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

Scheenstia
Temporal range: Late JurassicEarly Cretaceous, 150–125 Ma
2013-03 Naturkundemuseum Berlin Dickschupperfisch Lepidotes maximus anagoria.JPG
Fossil specimen of S. maxima
Scientific classification e
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

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 JurassicEarly Cretaceous species of that genus have since been re-classified as Scheenstia following detailed phylogenetic analysis.[1]

ClassificationEdit

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

Protopterus

Semionotidae

Semionotus

Callipurbeckiidae

Semiolepsis

Paralepidotus

Macrosemimimus

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

ReferencesEdit

  1. ^ a b c 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.