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Figure 17

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Interpretation of synapomorphies of spermatozoa, placed on a phylogeny of the Polyopisthocotylea. Left: Character changes as postulated in Boeger & Kritsky (2001) [14]. The taxon defined by the character “presence of lateral microtubules in principal region of spermatozoon” is the Polyopisthocotylea as a whole. Right: Character changes as evidenced by present study. The taxon defined by the character “presence of lateral microtubules in principal region of spermatozoon” is restricted to the Mazocraeidea.

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