Bio unit 3 Sponges

What are phylum Porifera

Oldest living animals ( pore bearers )

What’s the 3 sponge classes

Calcera, Hexactinellida, demonspogie

What is unique about Calcera

Spicules are made of calcium carbonate

What is unique about Hexactinellida

Glass sponge ( spicules are made of Silica )

What is unique about Demospongie

Most diverse class ( skeleton is made of spicules and spogin )

Where do sponges live

Ocean all levels

What do sponges eat

Filter feeders ( eat marine plankton )

What makes sponges the most primitive animals

No Brains, no organ systems

Why are sponges hard to kill off

Can survive freezing temps, they eat bacteria, during unfavourable conditions sponges make gemmules ( tough resistant structure )

What is a sponges outer layer

Body of sponge is hollow, covered by a layer of ectoderm

What is pinacocytes

Sponges “skin”, provides protection and support to the sponge

What is a sponges inner layer

Inner layer or the endotherm is lined with specialized cells called choanocytes

What is an choanocyte

Comprised of nucleus, collar, cell body, and lined with flagellum, flagellum catches sponges food

What is the middle layer of the sponge

Jelly like layer between ecto and endo therm called mesophyl

How does water flow through the sponges

Water enters through Ostia ( body ), then enters spongocoel ( main cavity ), and exits out osculum ( exits the top holes )

What is an porocyte

Cells that make the pore channel

How do sponges catch food

Water moves through spongcoel, plankton found in water are caught by choanocytes using flagellum, then flagellum push the plankton to amoebocytes which absorb the food

What is an spicule

Needle like structure made of calcium