Echinoids (Echinodermata) from the Campanian (Upper Cretaceous) rocky coast at Ivö Klack, southern Sweden

Abstract

The echinoid fauna from the Campanian rocky shoreline at Ivö Klack in Sweden is described taxonomically; it includes 16 taxa, comprising three cidaroids, one diadematoid, two phymosomatoids, four saleniids, two holectypoids, three cassiduloids, and a single holasteroid. Of these, Tylocidaris (Tylocidaris) imbricata, Hirudocidaris botryoformis, H. zeamays, Trochalosoma ivoensis, Globator schroederi and Scaniosoma (n. gen.) surlyki are new. These taxa are interpreted to represent three distinct ecological groups; of these, one was adapted to living epifaunally on boulders, one epifaunally in crevices and the third shallowly buried in shell sands and gravels. The present study is based on material picked from residues of a large (500 kg) bulk sample from the upper part of the succession, and examination of historical collections.