GYRODACTYLUS-LONGIDACTYLUS N. SP., A MONOGENEAN FROM POMATOSCHISTUS-LOZANOI (DE BUEN) (GOBIIDAE) FROM THE NORTH-SEA

Gyrodactylus longidactylus n. sp., a gyrodactylid monogenean parasitis ing the gills of Pomatoschistus lozanoi (de Buen, 1923) in the North S ea is described. It is a species with rather small anchors which are o nly connected to a ventral bar which lacks a ventral bar membrane. The marginal hooks have long handles, which are always longer than the to tal length of the anchor. The pharynx has long pharyngeal processes. M easurements, drawings of the opisthaptoral hard parts, penis and phary nx, and SEM micrographs of this monogenean are presented. G. longidact ylus n. sp. is the first monogenean species described from P. lozanoi.