Redescription of Spalania crassisaccata (Cestoda, Cyclophyllidea, Hymenolepididae) from shrews of Kunashir Island

The morphology of the species Ditestolepis crassisaccata Sawada, Asakawa 19 92 from shrews of Kunashir Island was investigated. This cestode is found t o have serial heteronomous growth of proglottids, and each series consists of male and hermaphrodite parts. Mature segments of the male part possess o nly male generative organs, male and female copulatory apparatuses. The mat ure hermaphrodite segments have both male and female generative organs and also male and female copulatory apparatuses. The internal seminal vesicule is absent. re cirrus sack coil has the semen duct in the fundal part. In th e apical part of the scolex parenchyma there is a glandular organ that look s like an oval sack with thin wails. The mature proglottids contain additio nal copulative adaptations (sacculus aseccorius) that look like a sack arme d with fine bristles. The uterus develops only in segments of the hermaphro dite part. It is shoe-shaped in the beginning and concave behind; then its form becomes sack-like. Degraded segments of the male part and mature uteru s segments of the hermaphrodite part are separated from strobila one by one or small groups.