Aqua Sci Porifera Flashcards
What do suspension feeders use?
Choanocytes which drive water through canals and chambers, incidentally capturing minute particles of food
How are sponges different from other multicellular organisms
Cells are not arranged to form permanent tissues or organs
Classification is based according to the _______ of the internal skeleton
Chemical composition
Types of sponges
Calcarea, hexactinellida, demospongiae, sclerospongiae
Pinacocyte
Thin, flat cells that line the outer surface of a sponge
Choanocyte
Flagellated cells that have a collar-like ring of microvilli (digestion aids) surrounding the flagellum
Spicule
Microscopic needle-like spikes; composed of silica or calcium carbonate
Spongin
A fibrous protein made of collagen (what commercial sponges are made of)
Ostium
Opening for water to enter the sponge; multiple in numbers
Osculum
Opening for outgoing water
Spongocoel
Main chamber of the sponge
Porocyte
Opening of invaginations of the body wall (incurrent canals)
Asconoid
The simplest and least common; flagellar movements of the choanocytes create a current in which microscopic food particles are caught; often vase or cylindrical in shape
Synconoid
Body form appears to be folded; water enters the spongocoel through dermal pores; fold form radial canals which are lined with choanocytes
Leuconoid
Have extensively branched calal system; water enters through ostia, through incurrent canals which lead to choanocyte chambers and out through excurrent canals which lead to choanocyte chambers and out through excurrent canals to osculum;
No spongocoel is present
