metacercaria

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metacercaria

[¦med·ə·sər′kar·ē·ə]
(invertebrate zoology)
Encysted cercaria of digenetic trematodes; the infective form.
References in periodicals archive ?
For fascioliasis, the route of infection is ingestion of aquatic plants, most commonly watercress, which carry metacercariae from snails infected via fluke eggs shed by infected animals in their faeces.
It aims to provide new scientific evidence and technological developments to detect, monitor, and mitigate impacts of zoonotic parasites, mainly anisakid nematodes but also trematode metacercariae, occurring in European and imported fishery products.
Byrd described a new species (Table 2) of digene from larval metacercariae developing in a mother sporocyst found in a tentacle of the terrestrial snail Succinea retusa.
Thus on a seasonal or annual basis, environmental conditions may limit the availability of intermediate hosts or aquatic vegetation, prevent embryonation and hatching of eggs, and reduce survival of metacercariae (Swales 1935, Pybus 2001).
When metacercariae are ingested by their definitive host, they excyst and mature in the fish's hind gut (Young 1953).
Infection by Austrodiplostomum compactum metacercariae in fish from the Nova Avanhandava reservoir, Tiete river, Sao Paulo State, Brazil
To determine potential definitive hosts of the digenetic trematode, Bolbophorus damnificus, 2 American white pelicans (Pelecanus erythrorhynchos), 2 double-crested cormorants (Phalacrocorax auritus), 2 great blue herons (Ardea herodias), and 2 great egrets (Ardea alba) were captured, treated with praziquantel, and fed channel catfish (Ictalurus punctatus) infected with B damnificus metacercariae.
The second intermediate hosts, in which metacercariae form, are the same molluscs or frog tadpoles (Key .
jeffersonianum from Massachusetts, Fischthal (1955) noted unidentified immature trematodes and metacercariae from the species in New York, and Anderson (1960) documented the nematode, Cosmocercoides dukae in this salamander from Ontario, Canada.
Digeneans, which mature in the digestive tract of marine fish, are usually acquired through the consumption of invertebrates (crustaceans, molluscs, polychaetes, and echinoderms, among other taxa) which harbor encysted metacercariae (Rohde, 2005).
A subsample of specimens was examined by dissection for the presence of parasite metacercariae, including Ribeiroia.