Ascaridoid nematodes of teleostean fishes from the eastern north atlantic and seas of the north of europe

Abstract

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 ratios oesophagus length/width of cervical alae and ventricular appendage length/width of cervical alae allow Hysterothylacium aduncum to be divided into two subspecies: H. aduncum aduncum was found in Alosa fallax, A. alosa, Belone belone, Psetto maxima, Lophius piscatorius, Trachurus trachurus, Merluccius merluccius and Trisopterus luscus whereas H. aduncum gadi was found in Pollachius pollachius, P. virens, Cadus morhua, Merlangus merlangus, Scomber scombrus and Salmo salar. Hysterothylacium cornutum, H. rigidum and Maricostula incurva are recorded respectively from Thunnus germo alalonga, Lophius piscatorius and Xiphias gladius. The following species are described: Hysterothylacium reliquens from Pagellus acarne and Microchirus azevia, Hysterothylacium sp. from 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. © 1995 Princeps Editions, Paris.