Original paper

Freshwater Rissooidea from the Miocene of Belchatow,Poland (Gastropoda Prosobranchia: Hydrobiidae,Pomatiopsidae)

Kadolsky, Dietrich; Piechocki, Andrzej


Four species of Miocene freshwater Rissooidea are described from the horizonsA,B and C in the opencast lignite mine "Belchatow" in CentralPoland: Microprosostbenia Martinietta belchatovensis n.gen.n.sp.(C,B),tumida n.sp.(C,B), Belchatovia bydrobiopsis n.gen.n.sp.(A) and Staadtiellopsis scblickumi n.sp.tumida (B).The age of Belchatow -A is Early Tortonian (mammal age MN 9 ),ofBelchatow -B is early Langhian or late Burdigalian (early MN 5 ), of Belchatow -C is middle to late Burdigalian (MN 4 ).Martinietta ships of the other species are currently unknown.Martinietta,tively placed in the subfamily Belgrad in ae STEFANI and Staadtiellopsis schlickumi are related to older Miocene forms from central Europe,while the relation Microprososthenia and Belchatovia are tenta 1877 (new syn.HoratiiniTAYLOR 1966 )of the Hydrobiidae on the basis of the pitted protoconchmicrosculpture,the presence of a terminal varix, the 'pulling in' of the last half whorl and the continued present-day occurrenceof this group in freshwater habitats of Europe.Staadtiellopsis is a derived group related to Nystia ; its relationships with the Truncatellidae and the Pomatiopsidae are discussed.The presence of exclusively new taxa highlights the gaps in the known fossil record of Tertiary freshwater Rissooidea in the palaearctic region.



palaearcticHydrobiidaePomatiopsidaeMiocenePolandBelchatowtaxonomynew generanew speciesbiostratigraphybiogeographyfreshwatermicrosculpture