A new Late Ordovician microdomatid gastropod genus from Seville, south west Spain, with a revision of Ordovician Microdomatoidea

A new microdomatid gastropod, Eopagodea sevillana gen. and sp. nov., is des cribed from the Late Ordovician (pre-Hirnantian Ashgill) limestones of Sevi lle, Ossa Morena Zone, Spain. Palaeozoic microdomatids lived in shallow-wat er environments and were restricted to warm-water regions. Occurrence of mi crodomatid gastropods in the pre-Hirnantian Ashgill limestones of the Cerro n del Hornillo syncline (Ossa Morena Zone, Spain) is interpreted as an exam ple of an influx of warm-water faunal elements into the otherwise cool to c old climate of the Mediterranean region during a short-termed, pre-Hirnanti an increase of palaeotemperatures. The Late Ordovician microdomatid genus D aidia Wilson, 1951, is revised and two new Late Ordovician (Ashgill) subspe cies of Daidia cerithioides (Salter, 1859) are described: Daidia cerithioid es sewardensis n. subsp. from the Don River area of the York Mountains, Sew ard Peninsula, western Alaska, and Daidia cerithioides wilsonae n. subsp. f rom the Little East Lake Formation of northwestern Maine.