The insufficiently known nematode species Philometra filiformis (Stossich, 1896) (Philometridae) is redescribed based on light and scanning electron microscopical (SEM) examinations of specimens collected from the ovaries of the type-host, the common pandora Pagellus erythrinus (Linnaeus) (Perciformes, Sparidae), from off the Mediterranean coast of Tunisia. The male of this species was studied with SEM for the first time, which revealed some new, taxonomically important morphological features. The male posterior end has a caudal mound consisting of two lateral parts widely separated dorsally from each other, four pairs of small adanal papillae, a pair of large but moderately developed papillae located posterior to the cloacal aperture and a pair of small phasmids. The distal end of the gubernaculum is unique among all but one gonad-infecting species of Philometra Costa, 1845 by the chevron-shaped dorsal lamellar structures forming a median longitudinal range. Philometra filiformis is for the first time reported from Tunisian coastal waters, being the seventh philometrid species so far recorded from marine fishes off Tunisia.

Institute of Parasitology Biology Centre of the Czech Academy of Sciences Branišovská 31 370 05 České Budějovice Czech Republic

ISYEB Institut Systématique Évolution Biodiversité UMR7205 CNRS EPHE MNHN UPMC Muséum d'Histoire Naturelle Sorbonne Universités CP51 55 Rue Buffon 75231 Paris cedex 05 France

Laboratoire de Biodiversité et Écosystèmes Aquatiques Faculté des Sciences de Sfax Université de Sfax BP 1171 3038 Sfax Tunisia

Unité de Recherche Bio Écologie Animale et Systématique Évolutive Faculté des Sciences Université Tunis El Manar 2092 Tunis Tunisia

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First description of the male and subgravid female of Philometra serranellicabrillae Janiszewska, 1949 (Nematoda: Philometridae), a gonad-infecting parasite of the comber Serranus cabrilla (Linnaeus) (Serranidae) off Tunisia