''Crassodontidanus'' is an extinct

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

shark Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the ...

s and the sole member of the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Crassodontidanidae Crassodontidanidae is a family of extinct cow sharks that lived from the Early Jurassic to the Early Cretaceous. It contains three genera Genus (; : genera ) is a taxonomic rank above species and below family as used in the biological class ...

, in the

order Order, ORDER or Orders may refer to: * A socio-political or established or existing order, e.g. World order, Ancien Regime, Pax Britannica * Categorization, the process in which ideas and objects are recognized, differentiated, and understood ...

Hexanchiformes The Hexanchiformes Help:IPA/English, /hɛkˈsæŋkɪfɔːrmiːz/ are a primitive Order (biology), order of sharks, numbering just five extant species in two Family (biology), families, Chlamydoselachidae and Cow shark, Hexanchidae. Chlamydoselach ...

. It contains two extinct species.A new Jurassic cow shark (Chondrichthyes, Hexanchiformes) with comments on Jurassic hexanchiform systematics.

Swiss Journal of Geosciences Springer Science+Business Media, commonly known as Springer, is a German multinational publishing company of books, e-books and peer-reviewed journals in science, humanities, technical and medical (STM) publishing. Originally founded in 1842 in ...

, 104 (Suppl. 1): 107-114

Species

* ''

Crassodontidanus serratus ''Crassodontidanus'' is an extinct genus of sharks and the sole member of the family (biology), family Crassodontidanidae, in the order (biology), order Hexanchiformes. It contains two extinct species.A new Jurassic cow shark (Chondrichthyes, Hex ...

'' Fraas, 1855 * ''

Crassodontidanus wiedenrothi ''Crassodontidanus'' is an extinct genus of sharks and the sole member of the family Crassodontidanidae, in the order Hexanchiformes. It contains two extinct species.A new Jurassic cow shark (Chondrichthyes, Hexanchiformes) with comments on Juras ...

'' Thies, 1983

References

Jurassic sharks Cretaceous sharks Fossils of Germany Prehistoric shark genera Sinemurian first appearances Fossil taxa described in 2011 Hexanchiformes {{paleo-shark-stub