title: Fasciola hepatica: an unusual development of redial generations in an isolate of Lymnaea truncatula.
abstract: Single-miracidium infections of Lymnaea truncatula by Fasciola hepatica were experimentally carried out to identify the redial generations of this trematode when the larval development was unusual (when the first-appearing mother redia, or R1a redia, died after its exit from the sporocyst). Four parameters were measured in the body and pharyngeal region at weekly intervals. At day 49 post-exposure at 20°C, the body of the second mother rediae (R1b) was significantly longer than that of the subsequent generations, R2a and R2b/R3a (a mean of 3.0 mm instead of 1.0 and 0.9 mm, respectively). The body was significantly wider in the R1b and R2a groups than in the R2b/R3a rediae. The pharyngeal lumen was significantly wider in the R1b group than in the R2a and R2b/R3a rediae (a mean of 48.6 μm instead of 10.8 and 3.3 μm at day 49). The thickness of the pharyngeal wall did not differ in the R1b and R2b/R3a groups, but was significantly lower in the R2a group (19.5 μm instead of 23.0-23.6 at day 49). There was better development of R1b and R2b/R3a rediae in the snails when the R1a redia died, compared with normal larval development (with a living R1a redia).
authors.forename: D
authors.initials: D
authors.lastname: Augot
authors.forename: M
authors.initials: M
authors.lastname: Abrous
authors.forename: D
authors.initials: D
authors.lastname: Rondelaud
authors.forename: G
authors.initials: G
authors.lastname: Dreyfuss
authors.forename: J
authors.initials: J
authors.lastname: Cabaret
mesh_terms: D000818:Animals; D001699:Biometry; D005210:Fasciola hepatica / Q000033:anatomy & histology* / Q000254:growth & development*; D008195:Lymnaea / Q000469:parasitology*; D010614:Pharynx / Q000033:anatomy & histology