porifera+ cnidarians -vocab

sessile

not moving

porifera

“pore bearers”

spongin skeleton

body of the sponge

no body plan

no organized body shape, cavity (mesoderm) tissues

endoderm

inside skin

ectoderm

outside skin

amoebocytes

mobile cells in mesophyll area that deliver sperm, eggs, oxygen, waste, nutrient

spicules

tiny fragments that provide structure of sponge, each sponge has its own type of spicule

collar cells/choanocytes

AKA choanocytes, flagella on them draw in water and trap food particles

monoecious

can make both sperm and egg

diffusion

transport in between cells, spread out form high concentration to low concentration

cnidae-

“stinging cells”

medusa

mobile bell shaped stage

polyp

sessile vase shaped stage

epidermis

made of outer ectoderm

gastrodermis

made of inner endoderm, lines the gastrovascular cavity

cavity

hollow in the middle: sac body plan

cnidocytes

stinging cells for prey and defense

nematocyst

inside cnidocytes, containing coiled thread

stinging spines

anchors prey

mesoglea

jelly like middle layer