Transcript Sea Sponges Phylum Porifera

Phylum Porifera
SYMMETRY
• Asymmetrical: without symmetry
• Radially symmetrical: circle base/cut like a pie
• Bilaterally symmetrical: cut in half, right/left
halves are the same
Characteristics of Sponges
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The word Porifera means pore-bearing
No true tissues or organ systems
Asymmetrical or Radially symmetrical
Sessile (don’t move)
Filter feeder from H2O (plankton)
2 types of pores
• Ostia: (Ostium =
singular)
– Water intake
– Many small pores all
over sponge
• Oscula: (Osculum =
singular)
– Water output
– A few large pores on
top of sponge
Collar cell
• Line internal part of
sponge
• Have flagella which:
– Move H2O in and out
of sponge
– Bring in food & O2
– Remove waste & CO2
Sponge Anatomy
• Spongin
– The living tissue of
the sponge
• Spicules
– The skeleton of the
sponge
Types of Spicules
• Siliceous: made of silica (glass)
• Calcareous: made of calcium carbonate
• Bath sponge: lots of spongin but few or NO
spicules
Reproduction
• Asexual (Budding):
small part grow and
break off and
continue to grow
• Sexual (Spawning):
release sperm &
eggs out oscula
usually on a full
moon
Three Basic Shapes
• Ascon: Least surface area
• Sycon: Most surface area (many folds)
• Leucon: Middle surface area
Ascon
Sycon
Leucon