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	Aphrocallistes vastus
	This largish specimen is found in Barb Shaw’s lab. I am told it was trawled up in Hecate

Lots available on WWW

Glass sponges are the oldest of 3 sponge branches. Spiclues, cell types and morphology are distinctive.

Aphrocallistes is a widespread taxon and grows several meters high.

See the UCMP site for best technical to semi-popular treatment

And for the sponges in general

Sponge anatomy etc

Easier site “cloud sponge”

	Note the thin-ness of the tissue layer (right) and the 2 colors of tissue (left) perhaps the grey area was buried in sediment ; or was overgrown (dying) as in this Krautter image

Sponges as hot research topic	Because sponges just sit there, they can’t run away; nor hide; nor bite back, researchers believe they must have a potent chemical arsenal to “fight” off enemies
	Here is one of best basic biology guides I came across; well written Aussie site PDF
	Good treatment online including sponge “grades” of development—(down? For summer?