Rissoa (Pusillina) inconspicua Alder, 1844 subsp. Albella Loven, 1846 comb. Nova (Gastropoda: Prosobranchia) from Polish Baltic
In the paper the author describes Polish representatives of the subgenus Pusillina (Rissoa: Rissoidae) The characteristics of the shell features and their variability (especially of the ribs) is given. Next the protoconch, ctenidium, osphradium and male reproductive organs are concisely described. A more detailed description of the head pigmentation (within which three types: A, B, and A B are distinguished) penis variability and female reproductive organs (showing some very characteristic features) is given. Finally, the author lists the differences between the Polish Pusillina and the data in the literature on Rissoa albella, R. benzi and R. inconspicua. Basing on this, the author considers R. albella a probable subspecies of R. inconspicua, and the Polish Pusillina being identical with R. inconspicua albella. key woRDs: shell variability, protoconch, ctenidium, osphradium, head pigmentation, reproductive organs, penis http:/dx.doi.org/10.12657/folmal.002.004 Folia Malacol. 2: 63 72 Folia Malacologica 2/1988 was originally published as No. 1112 of Scientific Bulletins of University of Mining and Metallurgy, Cracow. This digitalised version was prepared by the Association of Polish Malacologists and first published on line on December 30th, 2016. ZESZYTY NAUKOWE AKADEMII G6RNICZO HUTNICZEJ IM. STANISlAWA STASZICA Nr 1112 Folia Malacologica z. 2