Search results for "Spiruroidea"
showing 3 items of 3 documents
The influence of food competition and host specificity on the transmission of Triaenophorus crassus (Cestoda) and Cystidicola farionis (Nematoda) to …
2000
Abstract As a superior competitor for planktonic food, vendace ( Coregonus albula ), when abundant, is expected to displace whitefish ( Coregonus lavaretus ) from feeding on plankton and to force it to rely more on benthic food. The predicted result would be a reduced abundance of the copepod-transmitted cestode Triaenophorus crassus in whitefish, but an increase in the abundance of the nematode Cystidicola farionis transmitted via benthic amphipods. We studied the occurrence of both parasites in whitefish during 1991–1996 in three interconnected areas at Lake Saimaa, Finland, where the densities of the vendace stocks varied due to natural fluctuation in year-class strengths. In accordance …
A new cystidicolid nematode from Mullus surmuletus (Perciformes: Mullidae) from the western Mediterranean.
2005
Ascarophis valentina n. sp. is described from Mullus surmuletus off the Valencian coast of Spain on the basis of both light and scanning electron microscopy. It can be distinguished from the other members of the genus by the length of the left (long) spicule of the males and by egg morphology. An updated grouping of the species of Ascarophis considered valid is provided with respect to these characters. The new species resembles Ascarophis capelanus, belonging to the group of species possessing eggs with a single polar knob with filaments, but is distinguished by the size of the body, the length of the esophagus (especially in relation to body length), the position of the vulva, and the siz…
A new species of the genusCrassicaudaLeiper et Atkinson, 1914 (Nematoda: Spiruroidea) from the penis ofGlobicephala melas(Traill, 1809) (Cetacea: Glo…
1990
The examination of a male long-finned pilot whale (Globicephala melas) stranded at Cullera (Spanish Mediterranean coast) resulted in the finding of nematodes of the genus Crassicauda parasitising the penis. Pathologies associated with these worms were observed and are described here. The morphometric and morphological study of these helminths revealed that they represent a new species, Crassicauda carbonelli n. sp., which differs from other species of the genus Crassicauda in body size, cephalic morphology and spicule size in the males. Crassicauda sp. described by Dollfus (1968) must be ascribed to C. carbonelli n. sp. The taxonomy, morphometric variability of the eggs, site in the hosts, …