After ingestion, the coracidium loses its ciliature and penetrates the gut into the body cavity where is develops from an oncosphere into a
plerocercoid (previously also called procercoid, see article for terminology of cestode larvae 23).
Larval stages (
plerocercoid) of these cestodes are mostly studied in intermediate hosts like teleost fishes, cephalopods and crustaceans.
Spiroxys contortus L3 - - - Eustrongylides excisus L3 - - - Contraceacum rudolphii L3 - - - Ergasilus sieboldi - - - Total 43.8 6.0[+ or -]4.0 (a) 2.63 n: number of examined fish; P: prevalence (%); MI: mean intensity; SE: standard error; A: abundance; met.: metacercaria; pl.:
plerocercoid; L3: L3 stage Table 2.
minimum and the
plerocercoid larvae of the bass tapeworm, Proteocephalus ambloplitis, to be associated with melanotic visceral fibrosis in bluegill.
Infective larvae (
plerocercoid) of Diphyllobothrium latum, the species most often associated with human infections, reside in the muscles of trout, salmon, pike, and sea bass (Nawa, Hatz, & Blum, 2005).
Life cycle of the parasite is indirect, involving two intermediate hosts, the first is a crustacean of genera Diaptomus or Cyclops in which procercoid stage develops and second is a fresh water fish which harbour
plerocercoid stage of the tapeworm.
diaglenae and Parapharyngodon chamelensis for the first time in Colima, while the
plerocercoid of the family Proteocephalidae and the nematodes Aplectana and Physalopteroides bahamensis, as well as the oligochaete Dero (Allodero), represent new records for the shovel-headed treefrog.
2 0-1 0.02 [+ or -] 0.14 ZUEC-PLA 32 Pseudempleurosoma 44 0-5 0.9 [+ or -] 1.3 guanabarensis ZUEC-PLA 33-39 Octoplectanocotyla 10 0-2 0.12 [+ or -] 0.4 travassosi ZUEC-PLA 29-31 Cestoda Callitetrarhynchus 2 0-1 0.02 [+ or -] 0.14 gracilis (
plerocercoid) ZUEC-PLA 42 Scolex pleuronectis 86 0-182 20 [+ or -] 30.4 (metacestode) ZUEC-PLA 43-55 Trypanorhyncha 30 0-12 1.4 [+ or -] 3 (cists) ZUEC-PLA 25-28 Nematoda Anisakidae (larvals) 100 5-112 50.7 [+ or -] 26 ZUEC-NMA 14-17 Copepoda Bomolochus sp.
Qiu et al., "An investigation of
plerocercoid infection of frogs in Guiyang city and an analysis on clinical characteristics of 104 cases," Journal of Guiyang Medical College, vol.
Sparganosis is a parasitic infection caused by the
plerocercoid larvae of the genus Spirometra.
The infected Cyclops is then ingested by a small freshwater fish (second intermediate host) where the procercoid is released and penetrates the intestinal wall of the fish developing to a
plerocercoid larva (sparganum) in the fish's muscles or viscera.
Eleven species of endoparasitic helminths were identified during routine parasitological examinations of 483 plaice (Table 1), but the larval digeneans Otodistomum sp.,
plerocercoid larvae of an unknown cestode species, and the nematode Hysterothylacium aduncum were observed too infrequently (<4% prevalence in all samples) to be considered useful as biological tags (see MacKenzie and Abaunza, 1998).