A new Early Cretaceous lamniform shark (Chondrichthyes, Neoselachii) Author Kriwet, Jürgen Author Klug, Stefanie Author Canudo, José I. Author Cuenca-Bescos, Gloria text Zoological Journal of the Linnean Society 2008 2008-10-31 154 2 278 290 https://academic.oup.com/zoolinnean/article-lookup/doi/10.1111/j.1096-3642.2008.00410.x journal article 3185 10.1111/j.1096-3642.2008.00410.x 3bf87428-0476-429e-821f-ff1e342ccc8b 0024-4082 4687724 11BE3245-904C-46DA-B052-16295D3FDAE3 FAMILY EOPTOLAMNIDAE NOV. Derivation of name: Derived from the name of the type genus, Eoptolamna gen. nov. Diagnosis: Lamniform sharks only known by isolated teeth and characterized by the following combination of characters: tearing-type dentition with very weak gradient monognathic heterodonty; a single pair of parasymphyseals(?) present; mesiodistally compressed teeth, with generally a single pair of lateral cusplets; robust roots with short branches; lingual protuberance more or less massive; with nutritive groove, which might be secondarily closed. Genera included: Eoptolamna gen. nov. , Leptostyrax , and Protolamna .