Porifera and Cnidaria
scientific phylum name: cnidaria
body structure

~radially ot biradially symmetric

~ bellshaped called medusa
~vase shaped called polyp
~2 cell layers
~~ outer layer- epidermis
~~inner- gastrodermis
getting food
~ when an object bumps up against the "trigger" on a cnidocyte, the nematocyst(organelle) inside it suddenly pushes the filament out of the cell with great force
~tentacles capture small animals with their nemotocyst and paralyze them with poisen that they inject.
~ the tentacles push it into their mouth.
~cells lining the cavity absorb nutrients, and waste are exited through the mouth
~reproduction- sexual
scientific name: porifera
majors classes
sponges , 5000  types
150 species live in freshwater
major classes
~hydrozoans
~ cubozoans
~seyphozoans
~ anthozoans
body structure
~ system of pores and canals
~radially symmetrical or asymmetrical
~ skeleton made up of protein collagen and spicules
~asconid -shaped like a simple tube perforated by pores
~syconoid- tubular body shape with single oscolum
   body wall is thick, and pores are longer
~leuconoid- largest, complex masses of tissue
getting food

filter feeders that sift microscopic particles of food from the water as it passes through them
reproduction

~ sexually
~asexually
how they help humans?
natural sponges are used to clean, and for baths
calcium from porifera is recycled
specialized cells

choanocytes