L4.7 larva Ce

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[:life-stage/id "WBls:0000690"] :life-stage/definition The eighth sub-stage of the L4 larva. vulFs have migrated closer such that the lumen is narrowed in the dorsal section. The approximate cutoff is when the width of the channel is less than the width of the vulD nucleus. At 20 Centigrade: 42.3 hours after hatching, 8.3 hours from the L3-to-L4 molt.

protoscolex stage

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[:life-stage/id "WBls:0000715"] :life-stage/definition An infective larval stage of cestodes which develops from the hydatid cyst. The stage begins when a clustering of cells emerge from the germinal layer of hydatid cysts. The buds elongate and the cells at their bases seem to diminish in number. Very early on a furrow appears in the elongated buds, delimiting anterior (scolex) and caudal (body) regions. Hooks are the first fully-differentiated structures formed at the apical region of the nascent scolex. A cone can later be seen at the center of the hooks, the body is expanded and a structured neck is evident between the scolex and the body. During protoscolex development this parasitic form remains attached to the germinative layer through a stalk. When fully differentiated, the stalk is cut off and the infective protoscolex is now free in the hydatid fluid. This stage ends when the protoscolex attaches, via the scolex, to the host intestinal tissue and begins to develop into a adult.

metacestode

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[:life-stage/id "WBls:0000716"] :life-stage/definition The larval stages of a tapeworm, beginning with the metamorphosis of the oncosphere and ending with the first evidence of sexuality in the adult worm. Includes the procercoid and plerocercoid stages of pseudophyllid cestodes, and the cysticercus, cysticercoid, coenurus, and hydatid stages of cyclophyllidean cestodes.

obsolete nematode adult intestinal stage

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[: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.

L4.3 larva Ce

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[:life-stage/id "WBls:0000686"] :life-stage/definition The fourth sub-stage of the L4 larva. vulFs have separated and the apex of the lumen is flat and capped by the anchor cell. The uterine lumen starts to form. At 20 Centigrade: 38.1 hours after hatching, 4.1 hours from the L3-to-L4 molt.

newly excysted juveniles

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[:life-stage/id "WBls:0000718"] :life-stage/definition A Digenean (fluke) life stage that occurs in the definitive host. The stage begins when the metacercariae excyst in the intestine of the host, and continues as the NEJs migrate through the liver parenchyma where they increase in size to juvenile flukes and then to mature adults.

Onchocerca microfilaria (mammalian stage)

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[:life-stage/id "WBls:0000727"] :life-stage/definition The stage that develops from the embyro and is released from the adult female worm, within the mammalian host. Microfilariae are unsheathed and are mainly found in nodules, the skin and connective tissues.

L4.4 larva Ce

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[:life-stage/id "WBls:0000687"] :life-stage/definition The fifth sub-stage of the L4 larva. utse is visible as a thin layer separating the vulval and uterine lumens. 'Fingers' are formed at the sides of the vulva next to vulB1 and vulB2. The uterine lumen is fully distended. At 20 Centigrade: 39.0 hours after hatching, 5.0 hours from the L3-to-L4 molt.

Platyhelminthes egg

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[:life-stage/id "WBls:0000705"] :life-stage/definition The egg stage of the Platyhelminthes life cycle. The stage ends upon hatching.

schistosomulum

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[: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.