Abstract: The glochidia of Lamprotula fibrosa develop to maturity in the outer gill of female and are expelled to the outside in winter, and then,the mature glochidia are parasitized to the gill of fish host and start the parasitic metamorphosis development.The parasitic period lasts about 4 months.The inner and outer byssuses disappear after parasitizing for 3 days.The foots develop after 35 days.The intestine,adductor muscle,nephridium and gill anlage develop after 90 days.The shells become thick and protrusive.The glochidia become larvae with a size of 253.37×273.26×179.96μm in the next spring,then leave the gill of fish host,and start their independent life.

Key words: Lamprotula fibrosa, Glochidia, Parasitic metamorphosis development, Larva