Paracestracion

Paracestracion is an extinct genus of heterodontid sharks from Early Jurassic to Early Cretaceous-aged rocks of England, France, Germany and Luxembourg. The genus, first described in 1911 by Ernst Hermann Friedrich von Koken in Karl Alfred von Zittel,[1] contains five species: P. bellis from the Bathonian of England,[3] the type species P. falcifer from the Tithonian and Kimmeridgian of Weymouth, England and Solnhofen, Germany, which was originally named as a species of Cestracion (now seen as a synonym of Heterodontus) in 1857 by Johann Andreas Wagner,[2] P. pectinatus from the Valanginian of France,[4] P. sarstedtensis, originally classified as a species of Heterodontus, from the Toarcian and Aalenian of Germany,[5] and P. viohli from the Tithonian-aged Painten Formation of Germany,[6][7] with a sixth indeterminate species known from the Toarcian-aged Variabilis layer of the La Couche à Crassum (part of the larger Posidonia Shale) of Luxembourg.[8]

Paracestracion Temporal range: Early Jurassic-Early Cretaceous,
Paracestracion falcifer fossil from Solnhofen, Germany
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Order:	Heterodontiformes
Family:	Heterodontidae
Genus:	†Paracestracion Koken in Zittel, 1911[1]
Type species
†Paracestracion falcifer Koken, 1911 vide Wagner, 1858[2]
Other species
†P. bellis Underwood & Ward, 2004[3] †P. pectinatus Guinot et al., 2014[4] †P. sarstedtensis Thies, 1983[5] †P. viohli Kriwet, 2008[6]
Synonyms
Cestracion falcifer Wagner, 1857[2] Heterodontus sarstedtensis (Thies, 1983)[5]