- cercarium
importer/temp
[:life-stage/id "WBls:0000708"] :life-stage/definition An infectious life-cycle stage, which can infect by direct skin penetration (e.g. Schistosoma sp.) or ingestion (e.g. Fasciola sp.). Cercariae develop in and emerge from the intermediate invertebrate (snail) host. In Schistosoma sp., the cercarium attaches to the skin of the definitive host and secretes proteolytic enzymes helping it to enter into cutaneous capillary vessel\; upon the penetration the cercarium sheds its tail and transforms into a schistosomulum. In Fasciola sp., cercariae encyst on vegetation as dormant metacercariae until ingestion by the definitive host.
- 3 hr schistosomulum
importer/temp
[:life-stage/id "WBls:0000724"] :life-stage/definition A tailless cercarium of Schistosoma sp, 3 hours post-infection by skin penetration of the definitive host.
- 24 hr schistosomulum
importer/temp
[:life-stage/id "WBls:0000725"] :life-stage/definition A tailless cercarium of Schistosoma sp, 24 hours post-infection by skin penetration of the definitive host.
- cysticercoid stage
importer/temp
[:life-stage/id "WBls:0000717"] :life-stage/definition A larval stage of some cestodes, including Hymenolepis sp. The cysticercoid is a type of cyst that is found in free form as well as being tissue-enclosed.
- obsolete nematode adult intestinal stage
importer/temp
[:life-stage/id "WBls:0000721"] :life-stage/definition OBSOLETE. An adult life-stage of a soil-transmitted nematode such as Trichuris sp. that resides in the intestinal epitheium. The stage ends when the posterior of the male and female worms emerge free into the intestinal lumen at which point the worm enters the lumenal stage.
- schistosomulum
importer/temp
[:life-stage/id "WBls:0000709"] :life-stage/definition A tailless cercarium of Schistosoma sp, which resides in the definitive host. After penetration and spending a few days in the skin, schistosomula migrate to the lungs and enter the systemic circulation and are carried to the mesenteric vein of the host where they mature into adult schistosomes.
- obsolete nematode adult lumenal stage
importer/temp
[:life-stage/id "WBls:0000722"] :life-stage/definition OBSOLETE. An adult life-stage of a soil-transmitted nematode such as Trichuris sp. in which the anterior portion (whip-like end) is threaded into the tissue mucosa and the posterior of the male and female worms emerges free into the intestinal lumen to facilitate feeding, mating, and subsequent egg deposition.