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The water bodies formed in forest complexes are characterised by a significant degree of isolation from other aquatic environments as well as from urban agglomerations. In industrial areas, they are refuges of biological diversity. The long-term ecological research carried out in woodland ponds has allowed us to identify a new site of the occurrence of Placobdella costata (F. Müller) (Hirudinida: Glossiphoniidae) in Poland, the fourth in the southern part of the country. Furthermore, ecological information about the habitat and accompanying freshwater leeches are given.
Taxonomic and biological-ecological information as well as literature pertaining to the eleven Polish representatives of glossiphoniid leeches are summarized. Taxonomic status of many species is unclear, and data on their life histories are often fragmentary. The existence of several different conflicting systems of glossiphoniid classification indicates that the taxonomical value of characters is unclear. The family requires a thorough modern revision. A new generic-level classification of the family is needed. Data on behaviour and life cycless of most species should be supplemented; anatomical variation and differences between the purported forms of glossiphoniid species should be re-examined. A detailed study on the life cycles and variation of the Polish members of the Glossiphoniidae would provide new and valuable data and would allow at least for proposing a good, modern standard of species description without which a world-wide revision is hardly possible.
The aim of the study was to determine leeches found on the lake fishes. From the lake Ukiel, 213 roaches (R. rutilus) and from the lake Wulpińskie 202 were examined between Nov. 1988 and Dec. 1999. From the Warniak 258 roaches and 9 tenches (Tinca tinca) were examined between May 1998 and Nov. 1999. Warniak on roach (R. rutilus) 4 Piscicola geometra and Hemiclepis marginata on the fish body were found, tench (Tinca tinca) P. geometra were found on gills. Ukiel on roach Piscicola pojmanskae on gills were found. Wulpińskie on roach P. pojmanskae and Piscicola sp. as well as 2 Caspiobdella fadejewi on gills were found. Prevalence and intensity of fish infection with leeches was low in all lakes. C. fadejewi and P. pojmanskae are the first recorded on the lake fishes. Further investigations are necessary since they can result in informations conceming inhabitation of new microhabitants with P. geometra gills.
In the light of recent studies (NESEMANN and CSÁNYI 1995) on the genus Batracobdella (VIRGUIER 1879) Batracobdella paludosa (CARENA 1824) - a component of the Polish fauna - is actually Batracobdelloides moogi (NESEMANN and CSÁNYI 1995).
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