Trematôdeos digenéticos (echinostomatidae) do estado de Goiás – Brasil

Abstract

(Morphological and bíological aspects of the sporocyst of Echinostoma erraticum Lutz, 1924 (Mendeheim, 1940) Komma, 1972.) 19 mollusks Biomphalaria stramínea (Dunker, 1848) from Goiânia, Brazil were infected experimentally with Echinostoma erraticum Lutz, 1924 (Mendeheim, 1940) Komma, 1972 For the first time the morphologícal, structural and biologícal characteristícs of sporocyst of this trematode were studied in the course of 30 day, starting with sporocysts with about 10 days evolution. The sporocysts develop on the pulmonary vein next to the heart of the mollusk (ventricle). On the lOth day they presented well delimitcd germinatíve masses; the first rédia within a sporocysts was observed on lhe 12th day; on the 14th day the first frcc redía was seen in the pericardiac arca. The sporocysts presented, at the utmost, three formed rédias simultaneously. 18 days after infection of the snails some exhausted sporocysts were found while other showed signs of involution, consisting of some changes in shape, absence of germinative masses, accumiilation of progressively dark granules, increasing progressiva. On the 40th day only exhausted sporocysts were left.