The word ‘Cockroach is derived from the Spanish word ‘Cucarachia’. The common Indian species of cockroach are Periplaneta Americana and Blatta orientalis. Periplaneta Americana is a native of tropical America.
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Earthworm is a metamerrically segmented animal. There are about 500 species of pheretima and 13 of them are found in India. Earthworms live in a moist soil rich in dead organic matter or humus. They are abundantly found in old pastures, lawns and gardens. They live in a burrows and the burrows are flooded with water in rainy season; they leave the burrows and creep on the moist surface of the soil in order to respire in air.
Paramoecium is an acellular slipper-shaped ciliate or slipper animalcule. It occurs in freshwater. The outermost cuticular membrane of the Paramoecium is cuticular membrane of the Paramoecium is pellicle which secreted by ectoplasm. The ectoplasm contains bottle-shaped organelle called trichocyst.
Amoeba is the simplest and most primitive protista, which can perform all vital activities such as locomotion, nutrition, digestion etc. in a single cell. Hence, it is regarded as an a cellular animal. It was first discovered by Von Rosel Rosinhof, in 1755. Amoeba means changing in shape.