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Extra resources for 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
Ultrastructural evidence for the systematic position of the Nemertodermatida (Turbellaria). Acta zool. fenn. 54: 193-207. , 1948. Studien iiber Skandinavische Turbellaria Acoela V. Ark. Zool. 41A: 1- 82. Wiley, E. , 1981. Phylogenetics. The theory and practice of phylogenetic systematics. Wiley Interscience, New York, 439 pp. Wilson, R. , L. A. Webster, 1974. Proto nephridia. BioI. Rev. 49: 127 -160. The major parasitic platyhelminth classes - progressive or regressive evolution? G. Malmberg Zoologiska Institutionen, University of Stockholm, S-106 91 Stockholm, Sweden Keywords: parasitic, Platyhelminthes, evolution, evolutionary capacity level Abstract The evolution of certain ontogenetic processes appears to be of special importance to subsequent evolution of a phyletic line, and their occurrence suggests there are various 'evolutionary capacity levels' occupied by major taxa.
5+5 (Fig. 7). In the monogeneans, the original number is also most likely 5 + 5 (Malmberg, 1982). This number correlates with that of the most simple type of protonephridial system found in hatching monogenean larvae (Fig. 3). l h:mo~ I:IOST EPI'XHELIUJ! :RIOB BODY PAliTS (~H~ CEBCClltll) """ part and the cercomer, and changes, to different degrees, in the larval protonephridial systems - indicate a progressive evolution quite different from progressive evolutionary tends among non-parasitic platyhelminths.
Kotikova, E. , 1979. Osobennosti evolyutsii nervnogo apparata tsestod. Tr. Zoo!. Inst. Akad. Nauk USSR 84: 34-38. (On 33 peculiarities of the evolution of the nerve apparatus in Cestodes. ) Kotikova, E. , 1985. Comparative characterization of the nervous system of the Turbellaria. This volume. Mamkaev, Yu. , 1966. Morfologicheskoye mnogoobraziye kak pokazatyel primitivnosti gruppy. In E. A. ), Nauchnaya konferentsiya, posvyashchennaya 100-letiyu so dnya rozhdeniya akademika A. N. , Tezisy dokladov.