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3 Invertebrate Phyla

Phylum Cnidaria

Phylum Mollusca

Mantle- Outer layer of tissue that secretes the shell of Molluscs

Mantle Cavity- Space lined by the mantle

Foot- Muscular locomotory structure of molluscs

Radula- Toothed structure made of chiten used for scraping and chewing food

Siphons- Tube like structure that allows waster to flow in and out of mantle cavity

Byssal Threads- Strong fibres secreted by mussels for attachment

Ink Sac- A gland that secretes ink to discourage predators

Pen- The reduced thin shell of squids

Open Circulatory System- A circulatory system open allowing things to flow in and out

Spermatophore- A packed of sperm in cephalopods

Radial Symmetry- Arrangements of similiar body parts around a central axis

Polyp- They cylindrically attached stage of Cnidarians.

Tentacles- A flexible alongated appendage

Medusa- Bell shaped free swimming stage of Cnidarians

Mesoglea- The layer between epdidermus and gastrodermus

Cnidocyte- A cell that contains Nematocysts

Nematocysts- The stinging structure of the Cnidarians.

Nerve Net- The Network of nerve cells.

Phyla Porifera

Feeding, Moving, And Reproducing

Symmetry and Level of Organization

They have radial symmetry. They are comprized of the medusa and the polyp.

Sessile- An organism fixed in one place

Porocytes- Tubular cells that make up the pores of the sponge

Collar Cells- A flagellated food trapping cell of sponges

Amoebocytes- A mobile cell in the body of invertebrates

Epidermal Cells- Cuticullar- of or relating to a cuticle

Spicules- minute sharp pointed object or structure

Spongin- Fibrous substance found in the skeleton of many sponges

Ostia- opening into a vessel/ cavity of the body

Osculum- Large aperature in a sponge through which water is expelled

Suspension Feeders- Feed by straining suspended matter from water

Broadcast Spawning- Gametes are released into the sea for reproduction.

Cnidarians are carnivores. They use there Nematocyst to capture prey.

Cnidarians move using the nerve net, with sensory deails around. They use there tentacles for propulsion.

Cnidarians reproduce by excreting gametes in the hope they will meet with gametes of the opposite sex.

Feeding, Moving and Reproducing

Molluscs feed using digestive enzymes that break down food. They gather there food by using there radula to grasp food.

Molluscs move by using there food in a locomotive action.

Molluscs reproduce by releasing sperm and eggs into the water and they meet and fertilize.

Major Classes

The Major Classes

Symmetry and Level of Oranization

The major classes of Molluscs are:

Gastropods

Bivalves

Cephalopods

Nudibranchs

Hydrozoans

Siphonophores

Scyphozoans

Anthozoans

Symmetry and level of Organization

The Poriferia has radial symmetry. Along with Bilateral and are asymmetrical. They have unorganized cells. They have a water vascular system.

Molluscs are bilaterally symmetrical. They are comprised of two parts. A head foot and a visceral mass.

Major Classes

Feeding, Moving and Reproduction

Class Calcarea

Class Hexactinellida - glass sponges

Class Demospongia

Poriferia are sessile, meaning the are fixed to one location. They feed using suspension feeding. Meaning they gather food particles suspended in water. They reproduce asexually with branches breaking off, becoming other sponges.

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