PTERYGOMETOPINE TRILOBITES FROM THE ORDOVICIAN OF BALTOSCANDIA

A revision of the Pterygometopinae from Baltoscandia has revealed that the subfamily is more diverse at the generic level than previously kn own. New genera are Ingriops, Oelandiops, Upplandiops, and Keilapyge. The earliest species of Achatella are included in the new subgenus A. (Vironiaspis). The new species Oelandiops mirificus, Upplandiops calvu s, Estoniops maennili, and E. fjaeckensis are described. Upplandiops c alvus differs from most other dalmanitaceans in having only ten thorac ic segments.