Recent bulk sampling and study of museum collections has revealed a high diversity of hybodont sharks from the English Bathonian, with 15 species being recognised. In addition, study of dental and skeletal material from the English Callovian has allowed the diagnosis of a new genus and species,Planohybodus peterboroughensisgen. et sp. nov., allowing the Bathonian speciesHybodus grossiconusAgassiz to be referred toPlanohybodus. Two additional new genera,SecarodusandFrangerodus, are erected for the Bathonian taxaHybodus polyprionAgassiz andStrophodus lingualisWoodward, respectively.Egertonodus duffinisp. nov. is described and the diagnosis ofEgertonodusbased on dental material is discussed. The previously unrecordedHybodussp.,Parvodussp., andLonchidionsp. are recognised but left in open nomenclature.Asteracanthus medius(Owen) is recorded in the British Bathonian for the first time, and the status of Bathonian nominal species ofAsteracanthusare assessed. Bathonian hybodonts showed great diversity in trophic ecology and many of the species are specific to particular palaeoenvironments.
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Rees et al. (2008) studied this question.
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