Marine Biology

, Volume 86, Issue 1, pp 37–45 | Cite as

Cortical and endosomal structure of the marine sponge Stelletta grubii

  • T. L. Simpson
  • P. F. Langenbruch
  • L. Scalera-Liaci


The fine structure of the marine astrophorid sponge Stelletta grubii is described for the first time. The following new data are presented: spongin is present, choanocyte chambers are diplodal, intercellular symbiotic bacteria are numerous and unequally distributed in the cortex and endosome, and collagenous fibril bundles are associated with lophocyte activity and are not elastic fibers. The cortex contains numerous fibril bundles, fewer symbionts, very few cells, and transitional zones with higher archeocyte density near the surface and endosome. Limited phagocytosis of the bacterial symbionts is observed. This species appears to be dioecious and oviparous. These observations suggest that the enigmatic species Chondrosia reniformis is closely related to S. grubii and that it should be placed within or near the astrophorids. The rhizoids of the red alga Phyllophora palmettoides penetrate the sponge tissue without eliciting the development of a structurally specialized contact zone in the sponge matrix or of a limiting epithelium.


Sponge Fibril Contact Zone Collagenous Fibril Transitional Zone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • T. L. Simpson
    • 1
  • P. F. Langenbruch
    • 2
  • L. Scalera-Liaci
    • 3
  1. 1.Laboratore d'Histologie et de Biologie Tissulaire et Centre de Microscopie Electronique Appliquée à la Biologie et à la GéologieUniversité Claude BernardVilleurbanne CedexFrance
  2. 2.Zoologisches Institut, Entwicklungsgeschichtliche Abteilung; Poppelsdorfer SchloßUniversität BonnBonn 1Federal Republic of Germany
  3. 3.Istituto di Zoologia Ed Anatomia ComparataUniversita di VariItaly

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