Hirudinea - feeding and digestion in annelids, Biology

Hirudinea - Feeding and Digestion in Annelids

Hirudinea involves free living and ectoparasitic leeches. Leeches are blood suckers. The digestive system contains a preoral chamber which accommodates a sucker at the base of which lies the triradiate opening, the mouth. The walls of the mouth are embedded along with jaws, three in number, of which one is mid-dorsal and the other two ventro-lateral. Each jaw bears a row of minute teeth. The alimentary canal contains a thick muscular pharynx followed by a short oesophagus. Unicellular salivary glands are found on either side of the pharynx. The oesophagus is followed through a crop, an extensive sac consisting of 10 to 11 chambers, the chambers communicate along with each other by openings surrounded by sphincters. Each camber is gave with a pair of backwardly directed lateral caeca. There is a progressive increase in the size of caeca, the anterior pairs being smaller in size, and the caeca of last chamber being the largest. Following the crop, there is a small round stomach with a much folded inner wall, and the stomach in turn leads into a narrow intestine the inner wall of that is provided with horizontal and transverse folds to increase the absorptive surface. The intestine is followed by rectum that opens outside by anus.

Posted Date: 2/4/2013 3:07:24 AM | Location : United States







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