By Ulrich Ehlers (auth.), Seth Tyler (eds.)
Read or Download 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 PDF
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Extra info 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
Example text
Also, from this point of view they are very unlikely to be of rhabdocoelan origin (Figs. 2a, band 4a, b). l'i\(J'l:CNEPHRIDUl. , RETICULAR BILATERiL, IJITERlOB + ENTERAl. tg~ TEGUMENTAL IN. \JfTERIOII GLAIID5 BOllY FLOI:! l [NGESTIOt; IIDUTD, PHARYNX, lNTi:ST 1m;; I EPITHELIAL LIFE MOUTH. OTOIlEPKRIDlAL SYSTElt. 5T:n flOIly-c(nRl~G. slrISt lllU~EhAL. u. RIDIAL SYSTEM, ANTERIOR CPENIliGS I I Fig. 4a. Important evoluti<;mary capacity levels in Cercomero- Fig. 4b. Phylogenetic diagram drawn up on the basis of the morphae.
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. Cercomeromorphaean evolution involves two different parts of the life cycle: one concerns the larvae, the other the rest of the cycle. The differences concerning development of the proto nephridial system during the latter part of the life cycle indicate there were three main levels of evolution in polyzoic cestodes, two main levels in monozoic cestodes, amphilinideans, and gyrocotylideans, and one in monogeneans.
S. Egusa, 1981. The systematic position of the genus Anoplodiscus, Monogenea, Anoplodiscidae. Syst. Parasito!. 2(4): 253 - 260. Rohde, K. & M. Georgi, 1983. Structure and development of Austramphilina elongata Johnston, 1931 (Cestodaria: Amphilinidea). Int. J. Parasito!. 13(3): 273 - 287. Initial morphological diversity as a criterion in deciphering turbellarian phylogeny Yu. V. e. the highest morphological diversity, is observed in those groups where these systems and mechanisms are evolutionarily most primitive.