Based on dissection of specimens collected in the field and on laboratory experiments, Lymnaea stagnalis (L.) has been found to consume live individuals of Potamopyrgus antipodarum (Gray), a prosobranch snail originating from New Zealand. P. antipodarum is not digested by the lymnaeid and passes undamaged through its gut. The phenomenon may be of significance for the expansion of P. antipodarum in European waters.
In the present paper a description of a Zairian population of the pill-clam Pisidium viridanum KUIP. is made. The shell morphology, external anatomy, biology of reproduction and ecology of mentioned species are studied.
In the rivers of the western and central parts of the Roztocze Upland, SE Poland, 37 species of Mollusca were found: 23 Gastropoda and 14 Bivalvia In the upper course of the Wieprz River 34 species of Mollusca occurred. In the Tanew River and its tributaries 24 species were found. In all investigated rivers bivalves of the genus Pisidium and the snail Ancylus fluviatilis predominated.
The bivalve family Sphaeriidae of Poland is revised. The paper contains descriptions and drawings of all 21 species of the recent fauna of Poland (3 species of the genus Sphaerium Scop., 1 of Musculium Link and 17 of Pisidium Pfeiff.). Description of particular species includes the data concerning shell morphology and its variability, ecology and distribution. A key to Polish species of Sphaeriidae is also given.
The malacofauna of the middle and lower Odra (Oder River), a large river degraded by human ac- tivities, is still rich and diversified. Fifty five mollusc species were recorded from 31 studied localities: 32 Gastropoda and 23 Bivalvia. The highest number of species (47) inhabited the areas between groynes, whereas the fewest species (20) were found in the river current outside groynes. As many as 14.5% of the re- corded species were alien to the Polish fauna: Lithoglyphus naticoides, Potamopyrgus antipodarum, Physella acuta, Ferrissia fragilis, Menetus dilatatus, Corbicula fluminalis, C. fluminea, and Dreissena polymorpha. The presence of so many alien species shows that the Odra, together with the system of canals (which through the Spree and the Havel connect it to the drainage basin of the Elbe), is a major route along which alien molluscs migrate to Poland.
In 1986-1990 the faunlstical investigations were carried out in Roztocze - geographical region in SE Poland. Assumptions, purposes, methods as well as the list of the examined high taxons, investigated habitats and localities were presented.
Melanoides tuberculatus (O.F. Müll.), a gastropod species new for the fauna of Poland, was found in discharge canals of the P¹tnów and Konin power stations, situated in the Kujawy Lake District (Central Poland). The exotic gastropod, known in Europe mainly from aquaria and conservatory ponds, is the sixth invasive mollusc species recorded from heated waters of the Kujawy Lake District. The following alien mollusc species had been earlier identified in the area: bivalves Anodonta woodiana (Lea) and Dreissena polymorpha (Pall.), snails Potamopyrgus antipodarum (Gray), Menetus dilatatus (Gould), and Ferrissia wautieri (Mirolli).
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