They produce long cocoons wich locate vertically in the soil in the same places as the worms. They have the peculiar expanded epidermis at about clitellum position called ?wings? which function is still unknown. The worms excrete casts on the soil surface by locating the tails up to the soil surface while the heads go down to deeper soils. The earthworms were all found at a depth of 5?15 cm from the surface in wet top soil and usually near casts. Ten new species of semi-aquatic earthworm genus Glyphidrilus Horst, 1889 are described from several river systems in Thailand. The semi aquatic freshwater earthworms of the genus Glyphidrilus Horst 1889 from Thailand Oligochaeta Almidae with re descriptions of several species Book Review:
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