Phylum Porifera (lecture) Flashcards
Porifera common name
Sponges
Porifera germ layers
Diploblastic
Filter/suspension feeding
Pull nutrients out of water using filter
2 Ways to increase filter/suspension feeding efficiency?
- Bigger filter surface area
2. Filter more water (faster flow)
Intracellular digestion
each cell does its own digestion
How do sponges do gas exchange?
Every cell has access to water and does its own gas exchange
How do sponges excrete ammonia without an excretory system?
Ammonia diffuses from every cell into the water, since every cell has access to water.
2 parts of sponge endoskeleton?
Spongin and Spicules
Elastic secretion that allows for flexibility
sponge endoskeleton
Spongin
Non-elastic, rigid, pokey
sponge endoskeleton
Spicules
Sponge hydrostatic skeleton allows for ___
Flexibility
Sponge type of symmetry
asymmetry
Sponge type of body organization?
Cellular
Different cell types
No tissues, organs, organ systems
Do sponges have nervous tissues?
No
Do sponges have a circulatory system?
No
What are the 3 sponge cell types?
Pinacocytes
Choanocytes
Mesenchyme
Pinacocytes
Outer covering
Choanocytes
Feeding cells
Mesenchyme
Repair, growth, immunity, reproduction
3 sponge body types
Asconoid (cup)
Syconoid
Leuconoid
Why does sponge flagellum beat to create a current?
to draw in water from the side and mesohyl moves food to cell body
Asconoid path of water
Ostia -> spongocoel -> osculum
Syconoid path of water
Ostia -> incurrent canals -> prosopyle -> radial canals -> apopyle -> osculum -> spongocoel -> osculume
Where are the choanocytes in Asconoids?
spongocoel
Where are the choanocytes in Syconoids?
radial canals
Leuconoid path of water
Ostia-> incurrent canals -> choanocyte chambers -> excurrent canals -> oscula (many out-holes)
Where are the choanocytes in Leuconoids?
Choanocyte chambers
How do Leuconoids grow?
Sprawling (across) instead of up
Sponge reproduction in the summer / spring?
Larvae characteristic and reason?
Sexual reproduction
flagellated larvae so they disperse
Sedentary adults usually give birth to ___ ___ to
Motile larva
How do motile sponge larva reduce competition between
Adult and larval offspring
Adult parents and adult offspring
Sponge reproduction in the Fall? What do they create?
Asexual
Create gemmules
Gemmules
Overwinter: Emerge in spring and create an adult sponge
What kind of skeleton to porifera have
Endoskeleton
Do porifera have a circulatory system?
No
Do porifera have a nervous system?
No
