1. Department of Zoology; University of Warmia and Mazury; Oczapowskiego 5 10-719 Olsztyn Poland
2. Department of Animal Histology and Embryology; University of Silesia; Bankowa 9 40-007 Katowice Poland
3. Division of Invertebrate Zoology; American Museum of Natural History; New York NY USA
4. Department of Plant Cytology and Embryology; Jagiellonian University; Grodzka 52 31- 044 Cracow Poland