Reproductive system of trematode 卵巢 生殖窦 阴茎 子宫 前列腺 卵棋 子宫末段 一梅氏腺 贮精囊 输卵管 总卵黄管 阴茎袋 卵黄球 子宫 受櫝囊 劳氏管 输精管 Mehlis gland, seminal po Female: ovary, oviduct, ooty Male: testis, vas receptacle laurers canal efferens seminal vitellaria, vitelline duct vesical, cirrus &cirrus uterus pouch
Reproductive system of trematode Female: ovary, oviduct, ootype, Mehlis’ gland, seminal receptacle, Laurer’s canal, vitellaria, vitelline duct, & uterus Male: testis, vas efferens, seminal vesicale, cirrus,&cirrus pouch
General features Life cycle is complicated -indirect life cycle a Usually need one or two intermediate host 引io- helminths a The first intermediate hosts are usually fresh water snails
◼ Life cycle is complicated – indirect life cycle ◼ Usually need one or two intermediate host – bio-helmiths ◼ The first intermediate hosts are usually fresh water snails General features
General features a Eggs can only develop(hatch in the miracidium fresh water ■ Asexual phase: 口 Eggs>miracidium in water>sporocyst in snail > redia sporocyst cercaria release in water redia >encysted metacercaria in second intermediate host- infective stage a Sexual phase a Preadult(Juvenile)> migrated to cercaria metacercaria favorable residing site> adult worm ≠ lay eggs
◼ Eggs can only develop (hatch) in the fresh water ◼ Asexual phase: Eggs→miracidium in water→sporocyst in snail →redia →cercaria release in water →encysted metacercaria in second intermediate host – infective stage ◼ Sexual phase Preadult (Juvenile)→migrated to favorable residing site → adult worm → lay eggs General features cercaria metacercaria redia sporocyst egg miracidium
General features Encysted metacercaria is usually the infective stage Schistosoma--cercaria) Egg has operculum except blood fluke Features reflecting adaptation to parasitism o Organs of attachment developed D Retardation of digestive system a Highly developed reproductive system
◼ Encysted metacercaria is usually the infective stage (Schistosoma-- cercaria) ◼ Egg has operculum except blood fluke ◼ Features reflecting adaptation to parasitism Organs of attachment developed Retardation of digestive system Highly developed reproductive system General features
Clonorchis sinensis 华支睾吸虫 liver fluke,肝吸虫) Clonorchis sinensis Peter Darben Adult- Carmine Stain Adult- Haematoxylin Stain
Clonorchis sinensis 华支睾吸虫 (liver fluke,肝吸虫)