paraphyletic		cells arranged in simple sheets
choanoderm		how classes of sponges are divided, based on...
oxidation		type of reproduction in sponges
fragmentation		class of sponges with spicules made of calcium carbonate
asconoid		contain an ancestral group and all of its descendants
atrium		inner layer of a sponge
leuconoid		inorganic skeleton
hexactinellida		internal transport occurs by
microvilli		epithelial layer of sponges containing pinacocytes
demospongiae		how water moves through a sponge
spongin		process that occurs when the organic part of a sponge is bleached
diffusion		derived from 2 or more distinct ancestral lineages; not ok
encrusting		glass sponges
monophyletic		exclude one or more descendants of an ancestor
passive		collagen matrix giving sponge its shape
choanoflagelletes		another type of sponge shape
polyphyletic		class of sponges with megascleres and microscleres; most common
pinacoderm		first living organism
synapomorphy		a shared, derived character
symmetry		what the flagellum is surrounded by
spicules		one type of spomge shape
barrel		most complex body form; chambered
calcarea		central water chamber