Search results for "Digenea"
showing 9 items of 49 documents
Robinia aurata n. g., n. sp. (Digenea: Hemiuridae) from the mugilid Liza aurata with a molecular confirmation of its position within the Hemiuroidea.
2006
Robinia aurata n. g., n. sp. is described from Liza aurata (Mugilidae), the golden grey mullet, from the Ebro Delta, Spanish Mediterranean. The new genus differs from all other hemiurid genera in the combined possession of muscular flanges and a vestigial ecsoma. Within the Bunocotylinae, which currently accommodates 2 genera, Bunocotyle and Saturnius, the new genus exhibits a unique combination of blind caeca, Juel's organ, post-ovarian bulk of the uterus in the hind-body, and tegumental papillae surrounding the oral and ventral sucker apertures. Furthermore, Robinia n. g. differs from both Bunocotyle and Saturnius in the nature of the muscular extensions around the oral sucker, with the s…
Dicrocœliose pancréatique des Goélands leucophées en Corse. Données nouvelles surBrachylecithum microtesticulatum(Digenea, Dicrocoeliidae) parasite d…
1989
Brachylecithum microtesticulatum Timon-David, 1955 etait connu de seulement trois exemplaires en mauvais etat trouves dans l’intestin anterieur d’un Goeland leucophee Larus cachinnans michaellis Naumann (syn. : L. argentatus michaellis ) de Provence (Ile de Riou). Les auteurs ont redecouvert ce parasite en grand nombre chez plusieurs de ces Oiseaux en Corse. Ils precisent les particularites morpho-anatomiques et metriques de ce Distome, ainsi que ses variations intraspeciflques. Le microhabitat d’election tres original de ce Ver adulte (canaux pancreatiques) distingue ce parasite des autres especes du genre Brachylecithum qui sont essentiellement infeodees aux canaux hepatiques ou a la vesi…
A new species of Crepidostomum (Allocreadiidae: Digenea) from northeastern Finland, with comments on its possible origin
1988
Crepidostomum wikgreni n. sp. is described from the gall-bladder and intestine of the whitefish Coregonus acronius in Lake Yli-Kitka in NE Finland. It is morphologically similar to Crepidostomum farionis, with which it occurs sympatrically and sometimes concurrently; but it differs in that the eggs are much larger, i.e. 96±6.5 μm mean-length, as opposed to 71±4.7 μm mean-length for C. farionis in the same host and locality. It is suggested that the new species has arisen from C. farionis after deglaciation and since c. 8,400 BP, at which time the waters of the Lake Kitka System were isolated from those in the rest of Finland and flowed eastwards into the White Sea Basin. The isolation of th…
Molecular and Morphological Differentiation of Two Similar Species of Accacoeliidae (Digenea):Accacladocoelium macrocotyleandA. nigroflavumfrom Sunfi…
2014
In a study of 106 sunfish, Mola mola (L.), from Mediterranean waters, 2,731 worms, belonging to 2 congeneric species of accacoeliids, Accacladocoelium macrocotyle (Diesing, 1858) Robinson, 1934 and Accacladocoelium nigroflavum (Rudolphi, 1819) Robinson, 1934 , were collected from the digestive system. It is often difficult to differentiate between these 2 species as they are sympatric and very similar; in fact, according to previous descriptions, the extent of the vitellarium is the only interspecific difference, described as extending posteriorly to the ovary in A. macrocotyle and as anterior to the anterior testis in A. nigroflavum. However, this diagnostic trait is not always valid; more…
Interrelationships of the Haploporinae (Digenea: Haploporidae): A molecular test of the taxonomic framework based on morphology
2009
The taxonomic framework of the Haploporidae is evaluated and the relationships within the Haploporinae are assessed for the first time at the generic level using molecular data. Partial 28S and complete ITS2 rDNA sequences from representatives of six of the nine recognised genera within the Haploporinae were analysed together with published sequences representing members of two haploporid subfamilies and of the closely related family Atractotrematidae. Molecular analyses revealed: (i) a close relationship between the Atractotrematidae and the Haploporidae; (ii) strong support for the monophyly of the Haploporinae, Dicrogaster and Saccocoelium, and the position of Ragaia within the Haplopori…
Digeneans of cetaceans: taxonomy, evolutionary history and host specificity.
2016
Parasitism is an extremely successful lifestyle among animals. In fact, every free-living organism is believed to harbour at least a parasite species, and cetaceans are not the exception. Host-parasite systems offer a suitable model for studying systematics, evolution, biogeography and ecology because the evolutionary fate of parasites is linked to that of their hosts. In particular, present-day associations between cetaceans and their parasites have been shaped by unique historical events. The parasites of the terrestrial ancestors of cetaceans likely faced an ecological barrier when their hosts colonized the marine environment; it is postulated that during the process terrestrial parasite…
Experimental approaches to study the transmission and infection of Cardiocephaloides longicollis (Rudolphi, 1819) Dubois, 1982 (Trematoda, Strigeidae…
2023
Los trematodos (Platyhelminthes, Trematoda) son componentes ubicuos de los ecosistemas y, en las últimas décadas, los investigadores han mostrado un interés creciente en ellos, especialmente en sus estrategias y mecanismos de transmisión e infección. Los digeneos forman un grupo grande y generalmente tienen un ciclo de vida complejo con tres huéspedes. El primer huésped intermedio suele ser un molusco, el segundo huésped intermedio puede ser un huésped invertebrado o vertebrado, y el huésped definitivo suele ser un vertebrado. En el huésped definitivo, el parásito se convierte en adulto y se reproduce sexualmente. Luego, los huevos del parásito se liberan en el medio ambiente donde el mirac…
The effect of temperature on cercariae production of two Rhipidocotyle trematodes parasitizing freshwater mussel, Anodonta anatina.
2013
Two bucephalid trematodes, Rhipidocotyle campanula and R. fennica are known to infect the duck mussel, Anodonta anatina. The infection will lead to decrease growth, reproduction and survival of A. anatina. Given the important role of temperature on cercariae production, a vital component of the parasite’s transmission and life cycle success, the effect of temperature on cercariae production of two Rhipidocotyle sp. in their molluscan host, Anodonta anatina, was investigated. Mussels were collected from the Rivers, Haajaistenjoki and Kuusaankoski, marked and allocated to three temperature treatments—high, intermediate and low. Between May 31-October 28, 2011, clams were individually monitore…
Helminth Infection of the Loggerhead Sea Turtle Caretta caretta along the Coasts of Sicily and the North West Adriatic Sea
2021
We provide new data on the presence of helminth parasites in 64 individual loggerhead sea turtles Caretta caretta stranded along the coasts of Sicily and the northwest Adriatic Sea between June 2014 and August 2016. The necropsy examination revealed 31 individuals (48.4%) positive for endoparasites, showing a greater prevalence of trematodes than nematodes. In particular, seven species and a single genus of Trematoda (Hapalotrema) and a single species and genus of Nematoda (Kathlania) were identified. Among the Digenea flukes the species with the highest prevalence of infection were Rhytidodes gelatinosus (34.6%) and Hapalotrema sp. (33.3%), while among the Nematoda they were Kathlania sp. …