Poriferans: Ancestral animalian group

Poriferans: Ancestral animalian group
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What is a poriferans?
•  Pori (porus=pore) +
ferans (ferre= to
bear): Sponges
•  Phyla Calcarea and
Silicea or Phyla
Porifera
•  Lack true tissues
•  Habitat: fresh and
marine waters
Bilateria
Eumetazoa
Adapting from Campbell(8th)
Typical structure of sponge
osculum
•  Suspension feeder
ostium
pinacoderm
H 2O
flow
Side view
Atrium
Atrium=Spongocoel
Body Design
Inner
outer
Inner
outer
Inner
outer
ostium
ostium
ostium
http://en.wikipedia.org/wiki/Sponge
Asconoid
Syconoid
Leuconoid
Specific terms (words) for
each structure
Asconoid
Sclerocyte: to make spicule
Archeocyte
Spongocyte: to make collagen-like fiber
Thesocyte: to make gemmules (embryonical cells)
Syconoid
Inner
outer
Ostium
Pinacocyte
Atrium
Mesohyl
Choanocyte chamber
Incurrent canal
prosopyle
Leuconoid
Inner
outer
Pinacocyte
Choanocyte
chamber
Mesohyl
Incurrent
canal
Atrium
Ostium
prosopyle
Excurrent
canal
Animal properties
General animal activities
  Growth
  Increase population
How do they trap and digest food?
Moving and reproduction
•  Respiration
• 
Sponges' cells absorb oxygen by
diffusion from the water flow
system, into which carbon dioxide
and other soluble waste products
such as ammonia also diffuse.
•  Reproduction
egg
•  Fragmentation
+sperm
morular
•  Budding
•  Gemmulae
•  Movement
•  speeds of 1–4 millimetres
(0.039–0.16 in) per day
blastular
micropyle
Sexual reproduction
asexual
What are we doing?
Guide line for slide looking
Sycon type
Rule in the post test
•  1 min/1 question
•  Some questions have more than one sub
question.
•  Use technical term, only
•  The question, you can find in your answer
sheet
•  Don’t look friend’s answer
Example
1.  1) What is this
website? google
__________
2) What is a letter
pointed by arrow?
___________g
Your answer paper
My powerpoint