Abstract. Sixteen labrid species, including four Bodianus spp., were examined in New Caledonia (South Pacific) and monogeneans were found only on Bodianus perditio (Quoy et Gaimard). This species, Haliotrema banana sp. n., is the second Haliotrema species to be described from the labrids, the first being Haliotrema bodiani Yamaguti, 1968 from Bodianus albotaeniatus (Valenciennes), previously designated as B. bilunulatus (Lacépède). The new species is similar to H. bodiani in soft reproductive parts but differs from it in the morphologies of the hard haptoral parts, mainly in the shape of the dorsal bar (bar-shaped vs Vshaped in H. bodiani) and ventral bar. It is similar to Haliotrema spirale Yamaguti, 1968 and Haliotrema minutospirale Yamaguti, 1968 in the shape of the anchors and bars but differs from them in the detailed structures of the copulatory organ and vaginal system.The family Labridae includes fishes commonly known as wrasses and is the second largest family of fish after Gobiidae with 68 genera and 453 species (Randall 2005). In New Caledonia alone, 114 species have been recorded (Fricke and Kulbicki 2006). Although the Labridae includes many aquarium fish species, records of monogeneans from labrids are rare and thus far only two species of ancyrocephalids belonging to two genera, two species of capsalids from two genera and one species of microcotylid have been recorded. The two ancyrocephalids are Haliotrema bodiani Yamaguti, 1968 Yamaguti 1968, Radujkovic and Euzet 1989, Whittington and Horton 1996, Treasurer 1997, Whittington et al. 2001.In the present investigation monogeneans belonging to Haliotrema Johnston et Tiegs, 1922 were collected from goldspot hogfish, Bodianus perditio (Quoy et Gaimard). This new species is the second species of Haliotrema to be described from a Bodianus species and the third ancyrocephalid species described from a labrid species.
MATERIALS AND METHODSSpecimens of the labrids were caught with hand lines on board R/V "Coris" in various places off the barrier reef, Nouméa, New Caledonia at a distance of about 20-30 km from the shore, in depths of 20-40 m. Live fishes were kept in a container with sea water and immediately brought back to the laboratory. Gills were extracted and examined in sea water under a dissecting microscope. Live monogeneans were individually picked up from the gills with fine needles and immediately processed. Some monogeneans were flattened on a slide under a coverslip with a light weight on top and fixed in 70% ethanol. These were later stained in carmine as given in Justine (2005). A few specimens were prepared with ammonium picrate glycerine. Some specimens were collected from formalin-fixed gills of B. perditio and monogeneans were fixed and cleared in ammonium picrate glycerine. Some of these ammonium picrate glycerine fixed specimens were washed several times in distilled water to remove the fixative and then stained in Gomori's triple stain. The monogeneans were drawn with a microscope equipped with a camera lucida. Drawings were scanned ...