Turbellarian Biology: Proceedings Of The Sixth International Symposium On The Biology Of The Turbellaria, Held At Hirosaki, Japan, 7–12 August 1990 (developments In Hydrobiology)

Turbellarian platyhelminths (or, as they are known now among cladistic systematists, free-living Platyhelminthes) comprise a widely distributed assemblage of lower worms found in marine, freshwater, and even occasionally in terrestrial habitats. The phylum Platyhelminthes may be more widely known for its parasitic members since the major parasitic groups of the tapeworms, flukes, and their relatives are more speciose and have greater impact on everyday human life; but the turbellarians are more diverse and, as inhabitants of virtually any aquatic habitat, are more widespread as well. Many of the lower turbellarians are rather simple in morphology and have served as models for ancestors of the Bilateria, i.e., the bulk of the animal phyla. Others are quite complex organisms, especially in the morphology of their reproductive systems which are highly specialized. The majority are free-living in aquatic habitats but a number of interesting parasitic and commensal species are found scattered among the higher turbellarian taxa. But turbellarians are more than just taxonomic curiosities. They have served as illustrative models in research on a variety of basic life processes. For example, their high capacity for regeneration has made them the subject of a large literature in developmental biology, the occurrence of mixoploidy and other karyological oddities among turbellarians has been important in understanding evolution of the genome, and the fine structure and biochemistry of the nervous system in turbellarians is revealing important principles of the organization of so-called primitive neural systems. Front Matter....Pages i-xxvi Differentiation during asexual reproduction and regeneration in a microturbellarian....Pages 1-10 Studies of the budding process in Convolutriloba retrogemma (Acoela, Platyhelminthes)....Pages 11-17 Differentiation of epidermal cells in the regenerating planarian Dugesia japonica ....Pages 19-24 Effect of timing of cutting on patterning and proportion regulation during regeneration of the planarian Dugesia tigrina ....Pages 25-30 Inhibition of planarian regeneration by melatonin....Pages 31-40 Differences in blastema-associated proteins according to position along body axis in regenerating planarians....Pages 41-45 Dedifferentiation and redifferentiation of the penis of the freshwater planarian Bdellocephala brunnea ....Pages 47-56 Pharyngeal regeneration in the land planarian Bipalium kewense ....Pages 57-57 Two-stage carcinogenesis in the planarian....Pages 59-59 Formation of malformed pharynx and neoplasia in the planarian Bdellocephala brunnea following treatment with a carcinogen....Pages 61-70 Regeneration and the relationship between regeneration and development of cancerous tumors....Pages 71-71 Monoclonal antibodies as markers of specific cell types and regional antigens in the freshwater planarian Dugesia (G.) tigrina ....Pages 73-79 Production of cell- and tissue-specific monoclonal antibodies in the freshwater planarian Phagocata vivida ....Pages 81-91 Presence of rhodopsin-like proteins in the planarian head....Pages 93-94 Analytical studies of the ultrastructure and movement of the spermatozoa of freshwater triclads....Pages 95-104 Ultrastructural features of cocoon-shell globules in the vitelline cells of neoophoran platyhelminths....Pages 105-111 An electron-microscopic study of syncytium formation during early embryonic development of the freshwater planarian Bdellocephala brunnea ....Pages 113-118 Organization and differentiation of the body-wall musculature in Macrostomum (Turbellaria, Macrostomidae)....Pages 119-129 Ultrastructural aspects of nervous-system and statocyst morphogenesis during embryonic development of Convoluta psammophila (Turbellaria, Acoela)....Pages 131-137 Developmental sequence for the copulatory organs of Kontikia mexicana with remarks on taxonomic significance (Turbellaria: Tricladida: Geoplanidae)....Pages 139-144 Notes on the biology of the freshwater planarian Dugesia bengalensis (Platyhelminthes Turbellaria Tricladida)....Pages 145-145 Further survey of chromosomal polymorphisms in the freshwater planarian Polycelis auriculata ....Pages 147-156 Karyological and taxonomic studies of Dugesia japonica from the Southwest Islands of Japan-II....Pages 157-162 Karyology of four land-planarian species of the genus Bipalium from Japan....Pages 163-167 Cytogenetic studies of two land-planarian species from Brazil: Geoplana marginata and Issoca rezendei (Tricladida, Terricola)....Pages 169-173 Analysis of ploidy in a planarian by flow cytometry....Pages 175-178 Food ingestion by planarian intestinal phagocytic cells - a study by scanning electron microscopy....Pages 179-185 Experiments with culture media for planarian cells....Pages 187-192 Phagocytic response of planarian reticular cells to heat-killed bacteria....Pages 193-199 On the number and spatial distribution of the catecholamine-containing (GA-positive) neurons in some higher and lower turbellarians - a comparison....Pages 201-208 Catecholamines demonstrated by glyoxylic-acid-induced fluorescence and HPLC in some microturbellarians....Pages 209-219 Are there differences between proseriates and lower flatworms in ultrastructure of the nervous system?....Pages 221-227 Immunoreactivity to a specific echinoderm neuropeptide in the nervous system of the flatworm Macrostomum hystricinum marinum (Turbellaria, Macrostomida)....Pages 229-229 Comparative morphology of photoreceptors in free-living plathelminths - a survey....Pages 231-239 Comparative morphological studies on the visual systems in a binocular and a multi-ocular species of freshwater planarian....Pages 241-249 Ultrastructure of the photoreceptors of Allostoma sp. (Plathelminthes, Prolecithophora)....Pages 251-256 The multiple eyes of Polycelis . 1. Relation between the number of eyes and body length....Pages 257-262 Comparative morphology of statocysts in the Plathelminthes and the Xenoturbellida....Pages 263-271 Fine structure and function of ocelli and sagittocysts of acoel flatworms....Pages 273-282 Extracellular matrix in some microturbellarians....Pages 283-290 Anatomy and ultrastructure of the proboscis in Mesorhynchus terminostylis (Platyhelminthes, Rhabdocoela)....Pages 291-298 Unciliated body surface in three species of the Umagillidae (Dalyellioida, Platyhelminthes)....Pages 299-305 On the phylogenetic significance of sagittocysts and copulatory organs in acoel turbellarians....Pages 307-314 The evolution of protonephridia of the Platyhelminthes....Pages 315-321 Turbellaria Lecithoepitheliata: morphology, systematics, phylogeny....Pages 323-332 Polyclad turbellarians collected on the Osaka University Expedition to Viti Levu, Fiji, in 1985, with remarks on distribution and phylogeny of the genus Discoplana ....Pages 333-339 Temnocephalan symbionts of the freshwater crayfish Cherax quadricarinatus from northern Australia....Pages 341-347 Methods for taxonomic and distributional studies of terrestrial flatworms (Tricladida: Terricola)....Pages 349-352 On the taxonomic status of a Dugesia species from Buenos Aires (Platyhelminthes: Turbellaria: Tricladida)....Pages 353-354 Geographical distribution of Polycelis (Seidlia) auriculata in Japan....Pages 355-363 Northern circumpolar distribution of brackish-water plathelminths....Pages 365-368 Plathelminths in tropical intertidal sediments of northeastern Australia....Pages 369-374 Toxicology of planarians....Pages 375-383 Commensals of Mytilus galloprovincialis in the Black Sea: Urastoma cyprinae (Turbellaria) and Polydora ciliata (Polychaeta)....Pages 385-387 History of the study of Turbellaria in Japan....Pages 389-398