Ordovician Trilobites of the Subfamily Asaphinae of the Ladoga Glint

Trilobites of the subfamily Asaphinae Burmeister (genus Asaphus s.l.) coming from natural outcrops of the Ordovician beds on the southern shore of Lake Ladoga are monographically studied and revised. Forty-one taxa of the generic and specific ranks, including seven new taxa, are described; they constitute more than three-quarters of this widely known group of European Ordovician trilobites. Some points of asaphine ecology and phylogeny are considered. Considerable attention is paid to the stratigraphy of the Early-Middle Ordovician deposits of the eastern part of the northern Estonia-Lithuania confacial belt or the gray limestone zone, which is the parental facies of many trilobite groups of the Baltic Paleobasin.