By Ulrich Ehlers (auth.), Seth Tyler (eds.)
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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
Although we believe the phylum is monophyletic, we cannot demonstrate that monophyly; and so rather than forcing the three monophyletic groups together, it is preferable to treat each as independent (Fig. 14). Characters that may close the gap between these groups should come from study of catenulids and nemertodermatids, in particular. We need also to understand more fully the relationships of the phylum to other invertebrate groups, for its evolutionary origin remains one of the chief puzzles of metazoan phylogeny (Smith & Tyler, 1985a).
E": Statocyst of Convoluta-type (Ferrero, 1973; Ehlers, 1985a). F: With digestive parenchyma (Mamkaev, 1979; Smith, 1981; Smith & Tyler, 1985a). G: Biflagellate spermatozoan with 9+2, 9+0, or 9+ 1 axonemes (Hende1berg, 1977). , 1982). I: Paired protonephridia with flame bulb and canal cell interdigitating to form weir (Wilson & Webster, 1974; Ehlers, 1985a). J: Duo-gland adhesive system with viscid and releasing gland cells (Tyler, 1976). J': Duo-gland adhesive system with viscid and releasing glands opening within a common collar of microvilli (Tyler, 1976).
Zool. syst. Evolutionsforsch. 3: 1-18. Karling, T. , 1974. On the anatomy and affinities oftheturbellarian orders. In N. W. Riser & M. P. Morse (eds), Biology of the Turbellaria. McGraw-Hili, New York: 1-16. , J. P. S. Smith & S. Tyler, 1985. : significance for the turbellarian archetype. This volume. , 1962. Zwei neue Formen von Cyrtocyten. Vergleich der bisher bekannten Cyrtocyten und Erganzung des Begriffs 'Zelltyp: Z. Zellforsch. 57: 172- 201. , 1904. Die Eumesostominen. Z. wiss. Zool. 77: 1-273, Taf.