Advances in the Biology of Turbellarians and Related Platyhelminthes: Proceedings of the Fourth International Symposium on the Turbellaria held at Fre [Hardcover]

Phylogeny.- Comments on a phylogenetic system of the Platyhelminthes.- Is the Turbellaria polyphyletic?.- The major parasitic platyhelminth classes  progressive or regressive evolution?.- Initial morphological diversity as a criterion in deciphering turbellarian phylogeny.- Asexual reproduction and the turbellarian archetype.- Ultrastructure of the frontal organ in Convoluta and Macrostomum spp.: significance for models of the turbellarian archetype.- The phylogenetic significance of sperm morphology in the Platyhelminthes.- Phylogenetic relationships of the Temnocephaloidea (Platyhelminthes).- An ultrastuctural and cytochemical study of the digestive system in Oxyposthia praedator (Turbellaria: Acoela).- Frontal organs in the Acoelomorpha (Turbellaria): ultrastructure and phylogenetic significance.- Nervous System and Sensory Structures.- On the evolution of central nervous systems: implications from polyclad turbellarian neurobiology.- Comparative characterization of the nervous system of the Turbellaria.- Neuropeptides in free-living and parasitic flatworms (Platyhelminthes). An immunocytochemical study.- Aspects of photoreceptor structure and phototactic behavior in Platyhelminthes, with particular reference to the symbiotic turbellarian Paravortex.- Ontogeny.- Embryology of the Turbellaria and its phylogenetic significance.- Experimental evidence for the origins of determinative development in the polyclad turbellarians.- Electron microscopic study of larval eye development in Turbellaria Polycladida.- Reproductive System.- Eggshell formation in polyclads (Turbellaria).- Fine-structural characters in female and male germ cells of Proseriata Otoplanidae (Platyhelminthes).- Ultrastructural features of oogenesis in some marine neoophoran turbellarians.-Ultrastructural investigations on the differentiation of genital hard structures in free-living platy- helminths and their phylogenetic significance.- Ultrastructure of the copulatory stylet and accessory spines inlã7