J. Fryda et al., A new Late Ordovician microdomatid gastropod genus from Seville, south west Spain, with a revision of Ordovician Microdomatoidea, ALCHERINGA, 25(1-2), 2001, pp. 117-127
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.