SUMMARY. Cercaria truncatuloides n. sp. is described from experimentally infected Lymnaea truncatula. It is characterized by a dorsoventral finfold at the tip of the tail, 44 papillae on the tail and an extraordinary great number of papillae (96) on the acetabulum, and presumably belongs to a Paramphistomum species of cattle in GDR.
The chaetotaxy of P. spiculigerum mature cercariae was studied. Unlike from the known in the literature up to now, the chaetotaxy of the cercariae was com plemented as follows : a-the number and arrangement of the papillae on the dorsal, ventral and lateral sur face of the body were first described ; b-the arrangement of the papillae on the cephalic region and tail was corrected. Chaétotaxie des cercaires de Psilolrema spiculigerum (Mühling, 1898) Odhner, 1913 (Trematoda, Psilostomatidae).
Le cycle biologique de Paramphistomum leydeni Näsmark, 1937 est reproduit en labo ratoire. Les adultes proviennent de la panse d'un Bos taurus naturellement infesté de Tchécoslo vaquie. Des Planorbis planorbis sains infestés expérimentalement émettent les premières cercaires deux mois après l'infestation. Les structures argyrophiles du miracidium et de la cercaire sont décrites. Celles du miracidium sont identiques à celles de tous les miracidiums des espèces du genre Paramphistomum actuellement décrites dont P. togolense, P. phillerouxi, P. daubneyi et P. microbothrium ; elles sont différentes de celles du miracidium de Calicophoron calicophorum. Les structures argyrophiles de la cercaire ont des caractéristiques communes avec celles des autres cercaires de Paramphistomum déjà décrites : P. togolense, P. phillerouxi, P. daubneyi et P. microbothrium en particulier aux niveaux CII et AM V, mais la chétotaxie acétabulaire très particulière permet de différencier P. leydeni des autres cercaires de Paramphistomum connues à ce jour. Ainsi, d'une part, chaque espèce est aisément différenciable des espèces voisines, d'autre part, le genre Paramphistomum tel qu'il est admis par Näsmark (1937) apparaît bien fondé. Superficial argentophilic structures of miracidium and cercaria of Param phistomum leydeni Näsmark, 1937.
R É SU M É . Le Superficial argentophilic structures of the miracidium are identical to those observed in the other species of the genus. On the other hand, on the terebratorium, they are different from those of the miracidium of Calicophoron calicophorum.Cercarial papillae are rarely symmetrical and their number varies according to specimens. However differences between the species are obvious.If Paramphistomum microbothrioides, P. microbothrium and P. daubneyi are related by acetabular papillae, the number of lateral papillae and the caudal chaetotaxy allow to distinguish these three species.*
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