porifera
genus: leucosolenia class: calcarea Phylum: porifera
hard
bioerosin= chemical and mechanical removal of fragments by etching cells
how do demospongiae bore through shells?
calcareous= 200m hexactinellids= deeper demosponges= all depths
porifera depth distribution
egg, planula, scyphistoma, strobilia, ephyra, adult.
scyphozoa life cycle
class: demospongiae phylum: porifera
soft and can borrow
calcium carbonate
what are calcerea spicules made of?
spongin or silica
what are demospongiae spicules made of?
silica
what are hexactinellida spicules made of?
demospongiae
what class have all freshwater sponges?
grantia spicule
what is A?
spongilla spicule
what is B?
asconiod, one cell think choanoderm is simple and continuous
what sponge structure?
leuconoid sponge, seperate
what sponge structure?
syconiod sponge, folded choanoderm and two layers of mesohyl
what sponge structure?
asconoid, syconoid, and leuconoid
what structures are seen in calcarea?
leuconoid
what structures are seen in demospongia?