STUDY OF ANIMAL TYPE-COCKROACH
1. Omnipresent: something which is found everywhere is called omnipresent.
2. Omnivorous: Animal which can eat both plants and animals to survive is called omnivorous.
3. Nocturnal: Organisms which are active during night time is called nocturnal.
4. Cursorial: organisms which are specifically adapted to run is called cursorial.
5. Arthropoda: It is a vast group of animals having jointed appendages or leg
6. Ocellar spots / Fenestrae: Fenestrae are also called as ocellar spots situated at the base of each antenna and they appear as white spots.
7. Feelers: The antennae of cockroaches are called feelers.
8. Arolium: A padlike lobe projecting between the tarsal claws of many insects are called arolium.
9. Spiracles: An external respiratory organ present on the lateral side of the cockroach body.
10. Ommatidia: Ommatidia are structural and functional units of a compound eye, each forming an image of a very small part of the visual field. Collectively, the compound eye produces a mosaic image.
11. Haemocoel: The body cavity of cockroaches filled with blood is called haemocoel.
12. Hemolymph: The colourless blood the cockroaches are called haemolymph.
13. Hepatic Ceacae : Hepatic caeca are thin, transparent, short, blind (closed) and hollow tubules. hepatic caeca secrete digestive enzymes and thus help in digestion of food.
14. Cannibalism: The tendency of an organism to eat their own species is called Cannibalism.
15. Diastasis: It is a third phase in the heart cycle in which heart remain present in the expanded state.
16. Nephrocyte: a specialized cell, especially in arthropods, whose function involves the accumulation or formation of waste or excretory products.
17. Spermatophores: The sperms produced by the testes are stored in seminal vesicles and are glued together in the form of bundles called spermatophores.
18. Bursa copulatrix: Two lateral oviducts unite to form common oviduct or vagina, which in turn opens into the genital chamber (bursa copulatrix), the female organ of copulation.
19. Ootheca: The secretion of collateral glands forms a capsule around the egg is called ootheca or egg case. The ootheca is dark reddish to blackish brown capsule about 8 mm long, containing 14 to 16 fertilized eggs in two rows.
20. Paurometabolous development: The development of Periplaneta americana is paurometabolous i.e there is development through the nymphal stage.
