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Based on light and scanning electron microscopical studies of nematode specimens (males and mature females) collected from the ovary of groupers (Serranidae, Perciformes) in the Mediterranean Sea off Tunisia (near Tunis and Sfax), two gonad-infecting species of  Philometra  Costa, 1845 (Nematoda, Philometridae) are reported:  Philometra inexpectata  n. sp. from the mottled grouper  Mycteroperca rubra  and  P .  jordanoi  (López-Neyra, 1951) from the dusky grouper  Epinephelus marginatus . Identification of both fish species was confirmed by molecular barcoding. The new species is mainly characterized by the length of equally long spicules (147–165 μm), the gubernaculum (63–93 μm long) bearing at the tip two dorsolateral lamellar parts separated from each other by a smooth median field, a V-shaped mound on the male caudal extremity, the presence of a pair of large caudal papillae located posterior to the cloaca and by the body length of the males (1.97–2.43 mm).  Philometra inexpectata  n. sp. is the fifth known gonad-infecting philometrid species parasitizing serranid fishes in the Mediterranean region. The males of  P .  jordanoi  were examined by scanning electron microscopy for the first time; this detailed study revealed some new taxonomically important morphological features, such as the number and arrangement of cephalic and caudal papillae, presence of amphids and phasmids and mainly the lamellate structures at the posterior end of the gubernaculum. A key to gonad-infecting species of  Philometra  parasitic in serranid fishes is provided.

parasite

Two gonad-infecting species of<i>Philometra</i>(Nematoda: Philometridae) from groupers (Serranidae) off Tunisia, with a key to<i>Philometra</i>species infecting serranid gonads

Two gonad-infecting species ofPhilometra(Nematoda: Philometridae) from groupers (Serranidae) off Tunisia, with a key toPhilometraspecies infecting serranid gonads