Advances in the Biology of Turbellarians and Related Platyhelminthes -

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

Seth Tyler (Herausgeber)

Buch | Hardcover
358 Seiten
1986 | Reprinted from HYDROBIOLOGIA, 131, 1986
Kluwer Academic Publishers (Verlag)
978-90-6193-542-1 (ISBN)
213,99 inkl. MwSt
Proceedings of the Fourth International Symposium on the Turbellaria held at Fredericton, New Brunswick, Canada, August 5-10, 1984
While the reality of the taxon Turbellaria has been called into question lately, turbellarians are nevertheless the subject of active research by a sizable group of biologists. Turbellarians are relatives of the major groups of parasitic platyhelminthes - monogeneans, digeneans, and tapeworms - and most are free-living. Because the ancestors to the major parasitic groups would be classified as turbellarians, strict application of princi- ples of phylogenetic systematics dictates that the Turbellaria is not properly considered a separate taxon; i. e. , it is, in the parlance of systematics, a paraphyletic group. The relationships of turbellarians to other inver- tebrates are even more problematic than their relationships to other platyhelminthes; their relatively simple morphology has been variously interpreted as quintessentially primitive - meaning a turbellarian-like ances- tor would have given rise to most of the major groups of invertebrates - or as secondary simplification, meaning they would essentially be a dead-end group. Modern research on turbellarians covers a broad spectrum.
Questions of phylogenetics have inspired ultrastructural studies; the simply structured nervous systems of turbellarians make them good subjects for neurophysiology; simplicity of their tissue structure and the limited number of cell types make them good subjects of embryological and regeneration studies; they are emerging as iIIJ. portant indicator species in ecolo- gy; and improvements in biochemical methodology have meant they are at last amenable - despite their small size - to molecular biological study.

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 in Haplopharynx quadristimulus (Turbellaria)..- Comparative ultrastructure of copulatory organs having a stylet in the Proseriata (Turbellaria).- Development of the reproductive apparatus of the land planarian Rhynchodemus sylvaticus (Turbellaria: Tricladida) and its significance for classification in the genus.- Regeneration.- Cell migration and differentiation during wound healing and regeneration in Microstomum lineare (Turbellaria).- Physiological regeneration of the digestive parenchyma in Convoluta convoluta and Oxyposthia praedator (Turbellaria, Acoela).- Asexual reproduction, regeneration, and somatic embryogenesis in the planarian Dugesia tigrina (Turbellaria).- Positional information and gonadal differentiation in the planarian Dugesia lugubris (Turbellaria).- On the origins of neoblasts in freshwater planarians (Turbellaria).- Ultrastructural observations on gastrodermal regeneration in the planarian Dugesia japonica (Turbellaria).- Protein phosphorylation and the role of Ca2+ in planarian turbellarian regeneration.- Biology of long slender land planarians (Turbellaria) in Tokyo and environs.- Systematics and Cytology.- Karyology of a marine population of Gyratrix hermaphroditus (Turbellaria, Rhabdocoela) and chromosomal evolution in this species complex.- Chromosomal evolution in marine triclads and polyclads (Turbellaria).- Variation in karyotypes of Dugesia japonica japonica (Turbellaria) from Ôsaka Prefecture, central Japan.- On the karyology of Dugesia gonocephala s.l. (Turbellaria, Tricladida) from Montpellier, France.- Taxonomic studies onmarine triclads (Turbellaria, Tricladida, Maricola).- Ecology.- Ontogenetic patterns and phylogenetic trends in freshwater flatworms (Tricladida); constraint or selection?.- Reproductive ecology of Dendrocoelum lacteum (Turbellaria) in a rapid stream in southern Sweden and comparisons with a lake population.- Salinity-temperature tolerance of two closely related triclad species, Dugesia lugubris and D. polychroa (Turbellaria), in relation to their distribution in The Netherlands.- Distribution, abundance, and size of rhabdoids in Dugesia polychroa (Turbellaria: Tricladida).- The importance of turbellarians in the marine meiobenthos: a review.- Symbiotic Relationships.- An overview of surface specializations in the digenetic trematodes.- Occurrence of symbiotic turbellarians in the oyster Crassostrea virginica.- History.- History of the study of Turbellaria in China. Part 1: Ages of Materia Medica and of early expeditions by westerners.- Electron microscopy of turbellarian platyhelminths — a bibliography.- Index to authors.- Index to subjects.

Erscheint lt. Verlag 28.2.1986
Reihe/Serie Developments in Hydrobiology ; 32
Zusatzinfo 130 Illustrations, black and white; XVIII, 358 p. 130 illus.
Verlagsort Dordrecht
Sprache englisch
Maße 216 x 280 mm
Themenwelt Naturwissenschaften Biologie Limnologie / Meeresbiologie
Naturwissenschaften Biologie Ökologie / Naturschutz
ISBN-10 90-6193-542-3 / 9061935423
ISBN-13 978-90-6193-542-1 / 9789061935421
Zustand Neuware
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