Ultrastructure and formation of the bursa mouthpiece of Philocelis cellata (Plathelminthes,Acoela) |
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Authors: | Jochen Brüggemann |
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Institution: | (1) II. Zoologisches Institut und Museum der Universität, Berliner Stra e 28, D-3400 Göttingen, F.R.G. |
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Abstract: | Philocelis cellata has a strengthened bursa mouthpiece which is arranged in front of the male copulatory organ. The main components of the bursa mouthpiece are numerous ring-shaped bursa mouthpiece cells whose central parts contain strengthened elements forming a tube around the sperm duct. Each of the peripheral areas of the bursa mouthpiece cells is separated by similarly ring-shaped gap cells. The end of the bursa mouthpiece towards the bursa is formed by a so-called sorting apparatus which consists of different cells; opposite the bursa the sperm duct ends in a globe-shaped sperm vestibule. The bursa mouthpiece is differentiated successively, beginning at the distal part at the bursa and proceeding proximally. |
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Keywords: | Plathelminthes Acoela ultrastructure bursa mouthpiece |
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