NON CHORDATES CLASS 9 Eukaryotic Multicellular Heterotrophic No

NON – CHORDATES CLASS 9

� Eukaryotic � Multicellular � Heterotrophic � No cell wall � Mostly mobile

� Non – chordates or invertebrates � Chordates or vertebrates

� Organisms with holes or pores all over the body. � Non motile animals – attached to some solid support. � Canal system of circulation because of pores for circulating water throughout the body to bring in food and oxygen. � Covered with hard outer or exoskeleton. � Minimal differentiation and division into tissues. � Marine habitats

sycon euplectela spongilla

� Live in water � More body design differentiation � Presence of a body cavity � 2 layers of body cells – a layer outside the body and the inner lining of cells. � Some species live in colonies like corals � Others are solitary like hydra.

hydra corals Sea anemone Jelly fish

� More complex design of body. � Bilateral symmetry of body – left and right halves of body have same design. � Triploblastic – 3 layers of cells from which tissues are differentiated. This allows inside and outside body linings and some organs to be made. � No coelom or internal body cavity. � Called flatworms - Dorsiventrally flattened body ( flattened from top to bottom) � Either free living (like Planaria) or parasitic (like liver fluke)

planaria Liverfluke tapeworm

� Bilaterally symmetrical � Triploblastic � Cylindrical body � Tissues present, no real organs � Pseudo coelom or a sort of body cavity is present. � Parasitic worms causing diseases. elephantiasis Worms in intestine Filarial worms Roundworm or pinworms

ascaris wuchereria

� Bilaterally symmetrical � Triploblastic � Have a true body cavity – true organs packaged inside the body – extensive organ differentiation. � Body has segments lined up from head to tail. � Habitats – freshwater, marine water, land

nereis earthworm leech

� Largest group of animals � Bilaterally symmetrical � Segmented body � Open circulatory system – blood does not flow in blood vessels, blood fills the coelomic cavity � Have jointed legs (arthro + poda)

Palamnaeus (scorpion) Palaemon (prawn) Aranea (spider) Pariplaneta (cockroach) Musca (housefly) Scolopendra (centipede) butterfly

� Bilateral symmetry � Coelomic cavity is reduced � Little segmentation � Open circulatory system � Have kidney like organs for excretion � Foot is used for moving around.

chiton pila Unio octopus

� In Greek, echinos means hedgehog, derma means skin. � Spiny skinned organisms. � Free living � Marine � Triploblastic � Have a coelomic cavity. � Tube system which is water driven for moving around. � Skeleton made by hard structures made of calcium carbonate.

Antedon (Feather star) Echinus (sea urchin) Holothuria (sea cucumber) Asterias (star fish)

� Bilaterally symmetrical � Triploblastic � Have a coelom � Have a notochord at some stages of their life � Notochord = long rod like structure that runs along the back of the animal separating the nervous tissue from the gut. � Provides a place for muscles to attach for movement. � Marine animals

Balanoglossus Amphioxus Herdmania