Finally, we might have an answer for that long-standing palaeontological enigma!
Fischer V, Bardet N, Benson RBJ, Arkhangelsky M & Friedman M. 2016. Extinction of fish-shaped marine reptiles associated with reduced evolutionary rates and global environmental volatility. Nature Communications 7:10825. Freely available here and here (combined article + Supp Info) Covered in the several news, including Science, BBC, The European Commission, etc. See also ULg's Reflexion article here.
The last ichthyosaurs. Two ichthyosaurs (Pervushovisaurus bannovkensis) wander through a middle Cenomanian low latitude ecosystem that will prevail for most of the Late Cretaceous: high sea level and sea temperatures, rudist reefs (Ichthyosarcolites, Hippurites), newly radiating neoselacian sharks and acanthomorph fishes (Aipichthyoides). Artwork by © Andrey Atuchin 2016, based on Fischer & al 2016.