phylum porifera

What trait first appeared in Phylum Porifera?

Multicelluar

Calcarea

spicules are made of calcium carbonate

Hexactinellida

(glass sponge) spicules are made of silica

Demospongiae

Most diverse class of sponges, Skeletons are made of spicules, spongins

where do sponges live

marine, found at all ocean levels

What do sponges eat?

filters feeders that eat marine plankton= bacteria, archaebacteria, algae, protists

Why are sponges considered the most primitive animal? What systems are they missing? 

dont have: brains(nervous system), respiratory, digestive, circulatory, or excretory system

asexually reproduce

budding, fragmentation, gemmules

gemmules

environmental conditionals poor= sponges make gemmules.

Gemmules can go dormarnt, survining anything

why are sponges hard to kill off?

Survive in freezing temperatures, eating only bacteria. create gemmules