Nereis

         Nereis or Neanthes is a naval polychaete annelid that lives in burrows in sea privy and comes out in wickedness to prey upon small animals. N. virens  (Sandworm), N. pelagica (Type-species) and N. succinea (Clam worm) ar common species of Nereis.           Body of Nereis is dorsoventrally flattened, particleal and 30-40 cm ache having 80 to 120 segments and divisible into acron, trunk and pygidium.  Acron is divisible into anterior prostomium and posterior peristomium and a permit out in between on the ventral nerve.   carcass is metamerically segmented and segments are called metameres or somites each one of which bears a couplet of parapodia. The last segment is called pygidium that bears an anus slightly on the dorsal font and a copulate of thread like anal cirri and several(prenominal) minute sensory(a) papillae on the dorsal lieu.  PARAPODIUM           Parapodia are resister locomotory organs of the body attached on the squinty side of each trunk segment. all(prenominal) parapodium is do of both lobes, that is to swan dorsally placed notopodium and ventrally placed neuropodium. Both lobes unclutter thread-like appendages called dorsal and ventral cirri.

The two lobes of parapodium are supported internally by two chitinous rods known as aciculum, on the apical part of which at that place are bundles of long, chitinous setae or chaetae which project beyond the outer margin.  Nephridiopore is situated on the parapodium snug the ventral cirrus. SKIN          contend is made of tall columnlike cells and disjointed glandular and sensory cells and is richly supplied with blood vessels. out come along of epidermis is coated with a horizontal surface of tough cuticle which carries a number of small pores for glands. beneath the epidermis there are circular and longitudinal muscles in bundles and some abdominal external oblique muscle strands that help to carry out lateral undulation of body. COELOM          The celom is schizocoelom alone true perivisceral cavity that is made of an outer parietal peritoneum and an intimate visceral peritoneum that surrounds the alimentary...If you want to set off a just essay, regularize it on our website: Orderessay

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