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1

Antarctic representatives of the genus Lecithaster Luhe, 1901 [Digenea, Hemiuridae], with the description of a new species

100%
Zdzitowiecki K.
Acta Parasitologica
|
1992
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tom 37
|
nr 2
Lecithaster macrocotyle Szidat et Graefe, 1967 is redescribed basing on specimens from various notothenioid fishes, including the type host, Parachaenichthys charcoti (Vaillant, 1906). Lecithaster micropsi sp. n. is described based on specimens from a gadiform fish, Muraenolepis microps 1905 and from some notothenioid fishes. The species differ from each other in shape of oral sucker, pharynx/oral sucker ratio, oral/ventral sucker ratio and arrangement of uterine loops. L. macrocotyle occurs at the South Shetland Islands and South Georgia, and in the Kerguelen subregion. L. micropsi sp. n. occurs at South Georgia and on the Falkland-Patagonian shelf. Both species are compared with other representatives of the genus Lecithaster occurring in the southern hemisphere.
2

Species of Lecithocladium Luhe, 1901 [Digenea, Hemiuridae] from Australian marine fishes, with a description of a new species from various hosts off Eastern Australia

86%
Bray R. A., Cribb T. H.
Acta Parasitologica
|
2004
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tom 49
|
nr 1
Lecithocladium moretonense sp. nov. is described from Monodactylus argenteus (type-host), Abudefduf sordidus, A. whitleyi, Herklotsichthys castelnaui, Lutjanus russelli, Platycephalus indicas, Rhabdosargus sarba, Siganus nebulosus and Scorpis lineolata from Moreton Bay, southern Queensland, and Acanthopagrus australis from off northern New South Wales. It differs from most Lecithocladium species in having a subglobular oral sucker and pharynx. Other distinguishing features are the thin-walled recurved seminal vesicle and the pars prostatica coiling over the seminal vesicle to the level of the anterior testis. Lecithocladium megalaspis Yamaguti, 1953 from Alepes apercna, Moreton Bay and L. angustiovum Yamaguti, 1953 from Scomber australasicus, Fremantle, Western Australia, are also reported, illustrated and measured.
3

Estimation of the prevalence of outcrossing in the hermaphrodite trematode Lecithochirium rufoviride by allozyme analysis

86%
Vilas R., Paniagua E.
Acta Parasitologica
|
2004
|
tom 49
|
nr 1
The relative occurrence of outcrossing in two geographical populations of the digenetic trematode Lecithochirium rufoviride was investigated using starch gel electrophoresis to study the polymorphic locus Pgm-1. Assuming that the effects of mutation, genetic drift and natural selection on this locus are negligible, allozyme variation suggests the occurrence of extensive outcrossing in both populations, Ria de Arousa and Lianes (North of Spain). Therefore, the minimum outcrossing rate giving no statistically significant deviation respect to Hardy-Weinberg equilibrium was 70% and 66%, respectively. Despite of the asexual reproduction in the snail host, the possibility of self-fertilization as a component of the breeding system of this hermaphroditic helminth, and a population reproductive structure probably influenced by the habitat fragmentation, these results suggest that populations of this species in the definitive host, the European conger eel (Conger conger), are basically panmictic.
4

Diversity of the digenean fauna in sparid fishes from the Lagoon of Bizerte in Tunisia

51%
Ben Abdallah L. G., Antar R., Maamouri F.
Acta Parasitologica
|
2011
|
tom 56
|
nr 1
A total of 24 digenean species belonging to 10 distinct families (Derogenidae, Faustulidae, Fellodistomidae, Gyliauchenidae, Hemiuridae, Lepocreadiidae, Mesometridae, Monorchiidae, Opecoelidae and Zoogonidae) were recorded in sparid fishes from Bizerte Lagoon (northern Tunisia). The diversity of the digenean fauna of sparid fishes from this locality is compared to that recorded from the Gulf of Tunis. Prodistomum polonii, not detected before, was found in Sarpa salpa. Aphallus rubalo, Derogenes latus, Holorchis micracanthum and Pachycreadium carnosum previously recorded from sparid fishes on the Tunisian coasts were absent during this study. Allopodocotyle pedicellata, Lepocreadium pegorchis, L. album, Proctoeces maculatus, Magnibursatus bartolii and Macvicaria maillardi were reported in hosts not previously reported for the Gulf of Tunis. Generally, prevalence was higher in fishes from Bizerte Lagoon but abundance and mean intensity were higher in Gulf of Tunis. Except for Lithognathus mormyrus, Sarpa salpa and Sparus aurata from Bizerte Lagoon, which show higher digenean diversity, the other sparid fishes have a lower diversity compared to those from Gulf of Tunis. The species richness of digeneans in B. boops was the same in the two areas studied.
5

Precociously developed Ascarophis sp. [Nematoda, Spirurata] and Hemiurus levinseni [Digenea, Hemiuridae] in their crustacean intermediate hosts

44%
Jackson C. J., Marcogliese D. J., Burt M. D. B.
Acta Parasitologica
|
1997
|
tom 42
|
nr 1
Two adult and one subadult (L₅) Ascarophis sp. were recovered from amphipods Gammarus spp. sampled in Métis Bay, Quebec. Sexually mature metacercariae of Hemiurus levinseni were found in the mysids Neomysis americana and Mysis stenolepis collected from St. George’s and St. Ann’s Bay, Nova Scotia. Both of these helminths are normally parasites of fish as adults. Precocious development may result in either the acceleration of gamete production in an intermediate host or a shortened life cycle where the usual obligatory vertebrate host is no longer required.
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