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
Haplopharyngids (Doe, 1981, Smith & Tyler unpublished observations), a microstomid (Reuter & Palmberg, 1983; Reuter personal communicattion), and triclads (Hori, 1978) shows they contain a bundle of centrioles, presumably centrioles differentiating into ciliary basal bodies. More important than the simple absence of mitosis in epidermal cells, therefore, is the process of epidermal replacement by kinetosomecontaining cells that originate in the parenchyma; and we would prefer to consider this character an autapomorphy for the phylum.
6: 207 - 217. Rieger, R. , 1976. Monociliated epidermal cells in Gastrotricha: Significance for concepts of early metazoan evolution. Z. zoo!. Syst. Evolutionsforsch. 14: 198 - 226. Rieger, R. , 1978. Multiple ciliary structures in developing spermatozoa of marine Catenulida (Turbellaria). Zoomorphologie 89: 229-236. Rieger, R. , 1981. ' Hydrobiologia 84: 213-229. Rieger, R. , 1985. Asexual reproduction and the turbellarian archetype. This volume. Rieger, R. M. & M. Mainitz, 1977. Comparative fine structural study of the body wall in Gnathostomulida and their phylogenetic position between Platyhelminthes and Aschelminthes.
ID) circumvents the lack of synapomorphies between the Acoelomorpha and the other groups by considering that lack to be a case of reduction and linking the Acoelomorpha with the Rhabditophora (Fig. lD, black bar). This is equivalent to 'alternative 2' of Karling (1974) and to Ehlers' (1984, 1985a, b) system and seems to be the one most systematists of the Turbellaria would support. With it, protonephridia, ciliary rootlet systems, and mode of epidermal cell replacement are considered homologous in the Catenulida and Rhabditophora.