Abstract
The structure and morphogenesis of rhabdites as well as morphology of pharynx walls in Bothrioplana semperi (Turbellaria, Bothrioplanidae) have been described. The ultrastructure of rhabdites and their morphogenesis in this species resemble those in Macrostomida (Turbellaria, Archoophora). The relative position of muscle layers in the pharynx walls draws Bothrioplana semperi closer to Tricladida maricola and some Tricladida paludicola and terricola. The analysis of ultrastructural and morphological characters in Bothrioplana semperi as compared to those in Turbellaria proseriata and tricladida is provided. It is shown that the apomophous to plesiomorphous characters ratio in the taxa analyzed argues most for the hypothesis of an early branching of these groups and the early Turbellaria neoophora as a whole. If this is the case, Proseriata and Tricladida are not sister groups, while Bothrioplanidae should be regarded as a sister group to the ancestors of Tricladida and, possibly, Neodermata.
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Original Russian Text © E.E. Kornakova, 2012, published in Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, 2012, Vol. 48, No. 5, pp. 487–494.
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Kornakova, E.E. Ultrastructural and morphological features of the turbellarian worm Bothrioplana semperi and problem of monophyly of Seriata (Platyhelminthes, Turbellaria). J Evol Biochem Phys 49, 234–242 (2013). https://doi.org/10.1134/S0022093013020138
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DOI: https://doi.org/10.1134/S0022093013020138