3 Hydrobiologia 406: v—vii, 1999. r] B. M. Healy, T. B. Reynoldson & K. A. Coates (eds), Aquatic Oligochaetes. Contents Preface ix—x List of Participants XI-Xil Andreina Di Chiara (1937-1997): In Memoriam Xi1i—X1\ Historical reviews Past symposium attendees in the group photograph. by Stuart R. Gelder & Susan M. Peterson Retrospect and Prospect: reflections on forty years of study of aquatic oligochaetes by Ralph O. Brinkhurst Taxonomy and geographic distribution Zoogeography of branchiobdellidans (Annelida) and temnocephalidans (Platyhelminthes) ectosymbiotic on freshwater crustaceans, and their reactions to one another in vitro by Stuart R. Gelder Studies on the aquatic oligochaete fauna in Lake Biwa, central Japan. II. Records and taxonomic remarks of nine species by Akifumi Ohtaka & Machiko Nishino Monopylephorus camachoi nov. sp., a new rhyacodriline worm (Tubificidae, Clitellata) from the Coiba Island, on the east Pacific Coast of Panama TE ee ND ih iv tic nndea ncasbnneaneys ou xae heed ue ee neneadearenes Records of Enchytraeidae (Clitellata) from the People’s Republic of China by Hongzhu Wang, Zhicai Xie & Yanling Liang ..........e.ee. e.ee. e.ee. e.e e ee Distribution of freshwater oligochaetes in the west and east coastal regions of the North Pacific Ocean by Tarmo Timm Systematics and evolution Enzymatic variability in sympatric species of Tubifex (Clitellata: Tubificidae) by Andreina Paoletti Di Chiara, Manuela Pagani & Barbara Leoni 83-86 Terrestrial polychaetes — models for the evolution of the Clitellata (Annelida)? by Giinter Purschke 87-99 Vi Distribution, abundance and habitats Clitellate diversity in Nationalstadsparken, an urban national park in Stockholm, Sweden by Christer Erséus, Reinmar Grimm, Brenda Healy, Stefan Lundberg, Emilia Rota & Tarmo Timm 101-110 Finding enchytraeid oligochaetes (Clitellata) in hot climates: species occurrence on the shores of Bermuda by Brenda Healy & Kathryn A. Coates Spatial distribution of oligochaetes (Clitellata) in the tidal freshwater and brackish parts of the Schelde estuary (Belgium) by J. Seys, M. Vinex & P. Meire 119-132 Distribution and dispersal capacity of the Ponto-Caspian tubificid oligochaete Potamothrix heuscheri (Bretscher, 1900) in Scandinavia by Goran Milbrink 133-142 Oligochaeta and Aphanoneura in two Northern German hardwater lakes of different trophic state by Rut Collado, Peter Kasprzak, & Riidiger M. Schmelz ......................00 143-148 Micro-distribution of oligochaetes in a soft-bottomed lowland stream (Elsbeek; The Neth- erlands) by Piet F. M. Verdonschot 149-163 Oligochaeta from the abyssal zone of Lake Baikal (Siberia, Russia) by Patrick Martin, Koen Martens & Boudewijn Goddeeris 165-174 Oligochaetes of Karavasta Lagoon (Albania). Preliminary results by S. Casellato 175-182 Population dynamics A comparison among different population models for Limnodrilus hoffmeisteri Clapareéde (Oligochaeta, Tubificidae) by Andrea Pasteris, Martina Vecchi and Giuliano Bonomi 183-189 Assessment of secondary production of Naididae (Oligochaeta): an example from a North German lake by Boris Lohlein 191-198 Histology and ultrastructure Ultrastructure and functional significance of intestinojunctional spermathecae in en- chytraeids (Oligochaeta, Annelida) by Wilfried Westheide 199-211 New sperm types in Naididae and Lumbriculidae (Annelida: Oligochaeta) and their pos- sible phylogenetic implications by Marco Ferraguti, Christer Erséus, Irina Kaygorodova & Patrick Martin 213-222 CLSM analysis of serotonin-immunoreactive neurons in the central nervous system of Nais variabilis, Slavina appendiculata and Stylaria lacustris (Oligochaeta: Naididae) by René Hessling, Monika C. Miiller & Wilfried Westheide Development, physiology and behaviour Tubificoides benedii (Tubificidae, Oligochaeta) — a pioneer in hypoxic and sulfidic envir- onments. An overview of adaptive pathways by O. Giere, J.-H. Preusse & N. Dubilier Decoupling of fission and regenerative capabilities in an asexual oligochaete by Alexandra E. Bely Autotomy reflex in a freshwater oligochaete, Lumbriculus variegatus (Clitellata: Lumbriculidae) by Nalena M. Lesiuk & Charles D. Drewes Helical swimming and body reversal behaviors in Lumbriculus variegatus (Annelida: Cli- tellata: Lumbriculidae) by Charles D. Drewes 263-269 Pollution studies Bioaccumulation test with Tubificid Sludgeworms in artificial media — development of a standardisable method by Philipp Egeler, J. Rombke, M. Meller, Th. Knacker & R. Nagel 271-280 Progress Report Lumbriculids, branchiobdellidans and leeches: an overview of recent progress in phylogen- etic research on clitellates by Ralph O. Brinkhurst 281-290