Hard parts in the female system of Syndesmis longicanalis (Platyhelminthes, Rhabdocoela, Umagillidae) are basement membrane derivatives
Moens, Jozef B.
Martens, Els E
Schockaertt, Ernest R.
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Data are presented on the ultrastructure of the sclerotised parts in the female system of the symbiotic turbellarian (Platyhelminthes) Syndesmis longicanalis. The bursal canal, in- semination canal, and bursal valve are basement membrane derivatives. These structures are compared with hard parts derived from basement membrane in other turbellarians. The taxo- nomic value of the bursal valve in Umagillidae is rejected.