|These syconoid sponges are found intertidally in New England, attached to seaweed, shells & stones. It is commonly used in invertebrate laboratories as a type of sycon unit|
Longitudinal section through whole sponge, showing detail of the flagellated chamber "under oil immersion". You should be able to discern the choanocyte layer resting on teh meso hyl, as awell as amoebocytes. What is the space adjacent to the choanocytes ( in the direction of the flagellae)?
Can you determine the orientation of the specimen by which highly magnified
viewof the flagellates chamber? Under whcich conditions could you
see both cross sections and longitudinal sections through the flagellated
chamber in the same specimen? See BB p.55.
A. Choanocytes, B. pinacoderm, C-spicules, D-flagellated chambers, E-ostia, F-incurrent canal; external surface of the sponge is to the top
low power cross section
from Survey of Invertebrates (Zool250), University of Alberta;
image copyright © Ron Koss & A. Richard Palmer, used with permission)
A. Choanocytes, B- pinacoderm, C. spicules, D-flagellated chambers;
external surface of the sponge is to the top.