ASCARIDOID NEMATODES OF TELEOSTEAN FISHES FROM THE EASTERN NORTH-ATLANTIC AND SEAS OF THE NORTH OF EUROPE

Ascarid parasites of Teleostean fishes from the North Eastern Atlantic and seas of the North of Europe deposited in the collections of the ' 'Museum National d'Histoire Naturelle de Paris'' are studied. The rati os oesophagus length/width of cervical alae and ventricular appendage length/width of cervical alae allow Hysterothylacium aduncum io be div ided into two subspecies : H. aduncum aduncum was found in Alosa falla x, A. alosa, Belone belone, Psetta maxima, Lophius piscatorius, Trachu rus trachurus, Merluccius merluccius and Trisopterus luscus whereas H. aduncum gadi was found in Pollachius pollachius, P. virens, Gadus mor hua, Merlangus merlangus, Scomber scombrus and Salmo salar. Hysterothy lacium cornutum, H. rigidum and Maricostula incurva are recorded respe ctively from Thunnus germo alalonga, Lophius piscalorius and Xiphias g ladius. The following species are described : Hysterothylacium relique ns from Pagellus acarne and Microchirus azevia, Hysterothylacium sp. f rom Callionymus lyra and Goezia sp. from Trisopterus luscus. A key is presented for the species of Raphidascaridinae parasites of Teleostean fishes from North Eastern Atlantic and seas of the North of Europe.