Mastering Biology by O. F. G. Kilgour (auth.)

By O. F. G. Kilgour (auth.)

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Many have a head and special mouthparts. The body is segmented. The following are the important classes of arthropoda. (i) Class Crustacea These are mainly found in sea water and fresh water,whilst the woodlouse, Armadillidium, is terrestrial under stones and wood. 15 examples of arthropods: (a) a crustacean, shrimp, Pandalus sp. and (b) a myriapod, millipede, Julus sp. =#'--;" Tail fan (a) Shrimp (side view) Head with eyes Trunk of many double segments (70) Maxilla One pair of antennae Openin(,j of protect1ve stink glands (b) Millipede (side view) 37 taceae are important zooplankton, similar to shrimps (Fig.

The soft body is protected by one or two shells. Some molluscs, squids and cuttlefish have the shell internally as the 'cuttlefish bone'. Molluscs are freshwater, marine and terrestrial organisms and comprise about 5% of all animal species. 14 external features of a snail, Helix sp. Sensory tentacles Head Muscular foot with cilia Opening to anus and respiratory cavity Col lor Mouth w1lh rasping 'teeth' Reproductive opening 36 (h) Phylum Arthropoda, the jointed limbed organisms This phylum includes over 80% of all animal species.

ECHINODERMS A phylum of ammals wuh spiny skins, and globe or star-shaped bodies. and protective shell. Oyster and octopus. ARTHROPODS A large phylum of msects. spiders and centipedes. · Segmented bod1es with paned jointed legs. BIRDS Feathers and scaly legs. Forelimbs wings. Gill slit in embryo. Hen and pigeon. ANNEUDS A phylum of segmented cylindncal worms. Earthworm and lugworm. MAMMALS Skin with glands and hair. Mammary gland secretes milk. Gill slit 10 embryo. Rabbit, dog, seal and man. snake.

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