Selenopeltis (Trilobita) from Brittany and its distribution in the ordovician

The distribution of the genus SelenopeltisHawle & Corda throughout the Selenopeltis Province shows the presence during the Arenig of northern and southern species «groups, and a Llandeilo migration of the latter is identified within the Median Armorican synclinorium. New material of S. macrophthalmus (Kloucek) is described from Brittany together with S. gallicus gallicus nov. sp., nov. subsp. and S. gallicus irroratus nov. sp., nov. subsp.