Advances in the Biology of Turbellarians and Related Platyhelminthes : Proceedings of the Fourth International Symposium on the Turbellaria Held at Fredericton, New Brunswick, Canada, August 5–10, 1984

Proceedings of the Fourth International Symposium on the Turbellaria held at Fredericton, New Brunswick, Canada, August 5-10, 1984 Front Matter....Pages I-XVII Comments on a phylogenetic system of the Platyhelminthes....Pages 1-12 Is the Turbellaria polyphyletic....Pages 13-21 The major parasitic platyhelminth classes — progressive or regressive evolution....Pages 23-29 Initial morphological diversity as a criterion in deciphering turbellarian phylogen....Pages 31-33 Asexual reproduction and the turbellarian archetype....Pages 35-45 Ultrastructure of the frontal organ in Convoluta and Macrostomum spp.: significance for models of the turbellarian archetype....Pages 47-52 The phylogenetic significance of sperm morphology in the Platyhelminthes....Pages 53-58 Phylogenetic relationships of the Temnocephaloidea (Platyhelminthes)....Pages 59-67 An ultrastructural and cytochemical study of the digestive system in Oxyposthia praedator (Turbellaria, Acoela)....Pages 69-70 Frontal organs in the Acoelomorpha (Turbellaria): Ultrastructure and phylogenetic significance....Pages 71-78 On the evolution of central nervous systems: Implications from polyclad turbellarian neurobiology....Pages 79-87 Comparative characterization of the nervous system of the Turbellaria....Pages 89-92 Neuropeptides in free-living and parasitic flatworms (Platyhelminthes). An immunocytochemical study....Pages 93-99 Aspects of photoreceptor structure and phototactic behavior in Platyhelminthes, with particular reference to the symbiotic turbellarian Paravortex ....Pages 101-104 Embryology of the Turbellaria and its phylogenetic significance....Pages 105-115 Experimental evidence for the origins of determinative development in the polyclad turbellarians....Pages 117-119 Electron microscopic study of larval eye development in Turbellaria Polycladid....Pages 121-126 Eggshell formation in polyclads (Turbellaria)....Pages 127-135 Fine-structural characteristics of female and male germ cells in Proseriata Otoplanidae (Platyhelminthes)....Pages 137-144 Ultrastructural features of oogenesis in some marine neoophoran turbellarians....Pages 145-150 Ultrastructural investigations on the differentiation of genital hard structures in free-living platyhelminths and their phylogenetic significance....Pages 151-156 Ultrastructure of the copulatory stylet and accessory spines in Haplopharynx quadristimu- lus (Turbellaria)....Pages 157-163 Comparative ultrastructure of copulatory organs having a stylet in the Proseriata (Turbellaria)....Pages 165-173 Development of the reproductive apparatus of the land planarian Rhynchodemus sylvaticus (Turbellaria: Tricladida) and its significance for classification in the genus....Pages 175-180 Cell migration and differentiation during wound healing and regeneration in Microstomum lineare (Turbellaria)....Pages 181-188 Physiological regeneration of the digestive parenchyma in Convoluta convoluta and Oxyposthia praedator (Turbellaria, Acoela)....Pages 189-193 Asexual reproduction, regeneration, and somatic embryogenesis in the planarian Dugesia tigrina (Turbellaria)....Pages 195-200 Positional information and gonadal differentiation in the planarian Dugesia lugubris (Turbellaria)....Pages 201-206 On the origin of neoblasts in freshwater planarians (Turbellaria)....Pages 207-216 Ultrastructural observations on gastrodermal regeneration in the planarian Dugesia japonica (Turbellaria)....Pages 217-222 Protein phosphorylation and the role of Ca 2+ in planarian turbellarian regeneratio....Pages 223-227 Biology of long slender land planarians (Turbellaria) in Tokyo and environs....Pages 229-232 Karyology of a marine population of Gyratrix hermaphroditus (Turbellaria, Rhab- docoela) and chromosomal evolution in this species complex....Pages 233-238 Chromosomal evolution in marine triclads and polyclads (Turbellaria)....Pages 239-242 Variation in karyotypes of Dugesia japonica japonica (Turbellaria) from Ôsaka Prefecture, Central Japan....Pages 243-249 On the karyology of Dugesia gonocephala s.l. (Turbellaria, Tricladida) from Montpellier, France....Pages 251-256 Taxonomic studies on marine triclads (Turbellaria, Tricladida, Maricola)....Pages 257-262 Ontogenetic patterns and phylogenetic trends in freshwater flatworms (Tricladida); constraint or selection?....Pages 263-272 Reproductive ecology of Dendrocoelum lacteum (Turbellaria) in a rapid stream in southern Sweden and comparisons with a lake population....Pages 273-277 Salinity-temperature tolerance of two closely related triclad species, Dugesia lugubris and D. polychroa (Turbellaria), in relation to their distribution in The Netherlands....Pages 279-286 Distribution, abundance, and size of rhabdoids in Dugesia polychroa (Turbellaria: Tricladida)....Pages 287-293 The importance of turbellarians in the marine meiobenthos: a review....Pages 295-303 An overview of surface specializations in the digenetic trematodes....Pages 305-310 Occurrence of symbiotic turbellarians in the oyster, Crassostrea virginica ....Pages 311-315 History of the study of Turbellaria in China. Part 1: Ages of Materia Medica and of early expeditions by westerners....Pages 317-322 Back Matter....Pages 323-357