Download e-book for iPad: Biology of Earthworms by C.A. A Edwards

By C.A. A Edwards

ISBN-10: 0412110601

ISBN-13: 9780412110603

ISBN-10: 1489969128

ISBN-13: 9781489969125

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India, Ceylon, Australia, Java. Lampito Kinberg. India. Didymogaster Fletcher. Australia, New Zealand. Notoscolex Fletcher. India, Ceylon, Australia, New Zealand. Pliconogaster Beddard. Australia (South and West), New Zealand, South India. Comarodrilus Stephenson. India. Megascolex Templeton. India, Malaya, Australia, New Zealand, Pacific Islands. Digaster E. Perrier. ). Perissogaster Fletcher. ). Nellogaster Gates. India, South-east Asia. Nelloscolex Gates. India, South-east Asia. Exxus Gates.

Prostates are rare in the family Lumbricidae. 2. 1 Systematic affinities and descent Oligochaeta are grouped with the Polychaeta (bristle worms) and Hirudinea (leeches) in the Class Chaetopoda. Polychaetes are marine, whereas oligochaetes (except for a few species secondarily adapted) inhabit either soil or fresh water. Polychaetes may be considered as the older group because their larval development is more primitive than the oligochaetes, which have an embryo in a cocoon supplied by yolk or albumen.

Most respiration is through the body surface which is kept moist by the mucus glands of the epidermis, the dorsal pores which exude coelomic fluid and the nephridial excretions through the nephridiopores. There is a network of small blood vessels in the body wall of terrestrial earthworms, and oxygen dissolved in the surface moisture film permeates through the cuticle and epidermis to the thin walls of these vessels, where it is taken up by the haemoglobin in the blood and passed round the body.

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Biology of Earthworms by C.A. A Edwards


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