Abstract
Ultrastructure and differentiation of penis stylets and stylet needles have been investigated in representatives of various groups of free-living platyhelminths, viz. the Acoela, Macrostomida, Typhloplanoida, Kalyp-torhynchia, and Dalyellioida. In all these groups, the differentiation of such hard parts occurs intracellularly but in different ways in the different groups. The ultrastructure of the bursal mouth piece in an acoel platy-helminth is not comparable to the hard structures in male copulatory organs. The presence of penial copula- tory organs having intracellular hard structures appears to be an autapomorphy of the Euplatyhelminthes. Several characters in the ultrastructure and development of these structures can be used as autapomorphies for various platyhelminth groups.
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© 1986 Dr W. Junk Publishers, Dordrecht
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Brüggemann, J. (1986). Ultrastructural investigations on the differentiation of genital hard structures in free-living platyhelminths and their phylogenetic significance. In: Tyler, S. (eds) Advances in the Biology of Turbellarians and Related Platyhelminthes. Developments in Hydrobiology, vol 32. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4810-5_21
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DOI: https://doi.org/10.1007/978-94-009-4810-5_21
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