Formulae on Structural Organisation In Animals


 


1
Nephridiopores of integumentary nephridia 200-250 per segment found in all segments of earthworm except the first six. Clitellar segment contains 2000 nephridipores per segment, so called 'forest of nephridia'.



2
All segments of earthworm except the first, last and clitellar segment contain setae (perichaetine arrangement). Setae are 'S' - shaped, yellowish and chitinus, 80-120 segment. Setae and contraction of muscles help in locomotion.



   3
In male cockroach, eighth and ninth terga are overlapped by seventh tergum. In female seventh, eighth and ninth stema are fused to form a brood pouch. Seventh stermum of brood pouch forms a pair of gynavalvular plates.



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