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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.
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.
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.
Symmetry and Level of Oranization
The major classes of Molluscs are:
Gastropods
Bivalves
Cephalopods
Nudibranchs
Hydrozoans
Siphonophores
Scyphozoans
Anthozoans
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.
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.