アコヤガイ幼生の発生と形態

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Growth of shell length and development of soft tissues of Pinctada fucata larvae were observed mainly using an electron microscope. The veliger growth was divided into three stages ; i.e. slow growth during D-stage, rapid growth during umbonal stage and little growth during a few day before attachment. Alimentary canal became continue through the body, and differentiated esophagus, anterior stomach, posterior stomach, rudiment of digestive gland, rudiment of style sac and intestine in early D-stage. Digestive diverticula have developed from rudiment of digestive gland until early umbonal stage. Crystalline style appeared in the style sac of early pediveliger. The oil droplet-like granules in D-stage originated from egg and became scare until umbonal stage. Another granules which may be formed by feeding instead of glanules in D-stage larvae emerged in alimentary canal at the stages of early umbonal larvae to early pediveliger. Rudiment of byssal gland appeared between posterior body wall and digestive diverticula, and the foot emerged as an apophysis of posterior body wall at dorsal part of byssal gland in early umbonal stage. Eye spot, pedal ganglia, statocysts, visceral ganglia and rudimental heart differentiated from the posterior body wall of early pediveliger. Anterior adductor muscle and retractor muscles of velum in early D-stage were not striated, but both the muscles appear to be striated in early umbonal stage. Posterior adductor muscle appeared prior to attachment, which was not striated. Cerebral ganglia connection with apical organ protruded pleural ganglia toward posterior body wall. A pair of eye spots situated on either side of pedal ganglia, which connected pleural ganglia with a lot of granules. Mantle edge of early pediveliger divided into two foldst.
日本貝類学会の論文
1995-03-31

アコヤガイ幼生の発生と形態

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