Slides of phylum Anelida:
- T.S. Pheretima (Earthworm) – Pharyngeal region (a) Body wall is formed of outer cuticle, single layered epidermis, outer layers of circular and inner bundles of longitudinal smooth muscles, and inner parietal peritoneum.
(b) Presence of true coelom lined by peritoneal layers. (c) Presence of section of pharynx in the centre.
(d) Pharynx is divided into dorsal and ventral chambers by pharyngeal shelves. It is attached to body wall by dilator muscles.
(e) Presence of sections of dorsal vessel, ventral vessel and ventral nerve cord.
(f) bulb lies on the roof of pharynx.
- T.S. Pheretima (Earthworm)-Typhlosolar region .
(a) Body wall is formed of cuticle, single layered epidermis, smooth muscles (outer circular and inner bundles of longitudinal muscles) and parietal peritoneum.
(b) Presence of true coelom lined by peritoneal layers.
(c) Presence of a central section of intestine with a typhlosole.
(d) Presence of sections of dorsal vessel, ventral vessel, subneural vessel and ventral nerve cord.
(e) Presence of two supra-intestinal excretory canals.
- W.M. septal nephridium of
Earthworm (a) Nephridium is formed of
ciliated funnel, neck, body and terminal duct.
(b) Ciliated funnel opens by wide natural.
(c) Body of nephridium is formed of smaller straight lobe and long spirally twisted lobe which is again formed of proximal limb and distal limb spirally coiled upon each other.
(d) There are 4 ciliated tracts in a nephridium.
- V.S. Earthworm through setal sacs of Earthworm .
(a) Each seta is formed of 3 parts-base, body and neck.
Pheretima: A septal nephridium.
(b) Each seta is present in an epidermal setal sac and is secreted by a seta-forming cell. (c) Body of seta has a nodule.
(d) Setae are moved outward by 2 sets of protractor muscles and moved inward by single
retractor muscles..
- W.M. Spermatheca of Earthworm
(a) A spermatheca is flask-shaped.
(b) Spermatheca is formed of a small neck and lower swollen ampulla.
(c) Neck gives rise to caecum or diverticulum on inner side.