Body structure of marine sponges |
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| Authors: | Paul-Friedrich Langenbruch Tracy L. Simpson Lidia Scalera-Liaci |
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| Affiliation: | (1) Entwicklungsgeschichtliche Abteilung des Zoologischen Instituts der Universität Bonn, Poppelsdorfer Schloß, D-5300 Bonn 1, Federal Republic of Germany;(2) Laboratoire d'Histologie et Biologie Tissulaire et Centre de Microscopie Electronique Appliquée à la Biologie et à la Géologie, Université Claude Bernard, 43, Boulevard du 11 Novembre, F-69622 Villeurbanne, France;(3) Instituto di Zoologia ed Anatomia Comparata Università di Bari, Via Amendola 165/A, I-70126 Bari, Italy;(4) Present address: Department of Biology and Health Sciences, University of Hartford, 06117 West Hartford, CT, USA |
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| Abstract: | Summary Each choanocyte chamber of Petrosia ficiformis is formed by a slightly outpocked choanocyte epithelium and by a ring of three or four uniflagellated cone cells surrounding the apopyle. The apopyle opens into a small aphodus, which leads the water flow to larger excurrent canals. Pinacocytes of the incurrent canal system cover the basal surface of the choanocytes and separate them from the incurrent canals and the mesenchyme. The water flows into the chambers by pores in the pinacocyte cover and then through gaps between adjacent choanocytes. To our knowledge this is the first report of a leuconoid canal system in which choanocyte chambers are covered by a pinacocyte epithelium of the incurrent canal system that isolates the chambers from the mesenchyme. A future comprehensive revision of the types of canal systems in sponges seems to be necessary.Permanent affiliation: Department of Biology and Health Sciences, University of Hartford, West Hartford, CT 06117, USA |
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