Scheenstia

Scheenstia
	Fossil of Scheenstia maximus; from the Solnhofen limestone in the Museum of Natural History in Berlin.
Temporal occurrence
	Kimmeridgian (Upper Triassic) to Valanginian (Lower Cretaceous)
	157.3 to 133.9 million years
Locations
	Germany (Solnhofener Plattenkalk); France; Great Britain;
Systematics
	Ray fins (Actinopterygii)
	Neuflosser (Neopterygii)
	Bone organoids (holostei)
	Ginglymodes
	Lepisosteiformes
	Scheenstia
Scientific name
	Scheenstia
	López-Arbarello , 2012

Scheenstia is a genus of extinct bony fish thatoccurred in Europefrom the Kimmeridgian , the middle level of the Upper Jurassic to the Valanginian (Lower Cretaceous).

features

Scheenstia species were relatively large fish (> 0.5 m) with spindle-shaped bodies. The body height was 40 to 45% of the standard length , the head length about 30% of the standard length. The pelvic fins, dorsal and anal fin were located on the rear half of the body, the pelvic fin attachment after about 50 to 50% of the standard length, the dorsal fin attachment after 65 to 70% and the anal fin after 75 to 78% of the standard length. The thick, square, diagonal ganoid scales had a vertically moving joint in front and behind. Her maxillary (upper jawbone) was toothless, very short and wide. The sideline system extended into the eye region. The middle row of pores lay in a groove between the dermopteroticum (skin bones above the squamosum ) and the parietal bones . The Scheenstia species had three or more paired extrascapulars (a skull bone).

species

Scheenstia bernissartensis , Barremium and Aptium , Belgium
Scheenstia decoratus , Tithonium , Solnhofen limestone
Scheenstia degenhardti , Berriasium , Obernkirchen sandstone
Scheenstia hauchecornei , Berriasium, Obernkirchener sandstone
Scheenstia laevis , late Kimmeridgian, France
Scheenstia mantelli , Berriasium and Valanginium , France and England ( Sussex & Isle of Wight )
Scheenstia maximus , late Kimmeridgian and Tithonian, France and Germany (Solnhofen limestone)
Scheenstia Zappi ( type species ), Kimmeridgium, Schamhaupten

Systematics

The genus was only established in 2012 and consists of species that were previously assigned to Lepidotes . Together with Lepidotes (formerly Semionotiformes ) it was placed as a basal genus of the Lepisosteiformes , an order of original bony fish that still occurs today with seven species in North and Central America as well as on Cuba with the bonefish (Lepisosteidae).

literature

Adriana López-Arbarello: Phylogenetic Interrelationships of Ginglymodian Fishes (Actinopterygii: Neopterygii). PLoS ONE , doi: 10.1371 / journal.pone.0039370 .

Web links

Commons : Scheenstia - collection of images, videos and audio files

The Paleobiology Database: Scheenstia López-Arbarello 2012