British Cretaceous Echinoids

Abstract

ABSTRACT This part completes the systematic revision of the British Cretaceous echinoids with a review of the species belonging to the spatangoid family Micrasteridae. Eighteen species belonging to two genera, Roweaster nov. and Micraster, are described and illustrated and a key to the species is provided. Six of these species have not previously been recorded from the British Isles and one species, Micraster (Gibbaster) norfolkensis, is new. New plating diagrams are provided for these species. In addition a cassiduloid, Archiacia sp., and a new holasteroid, Pseudananchys speetonensis sp. nov., are described. Tables summarizing the stratigraphical and geographical distribution of all 222 British Cretaceous echinoids are provided.