A new genus for Diplectanum setosum Nagibina, 1976 (Monogenea: Dipletanidae), a parasite of Psammoperca waigiensis (Cuvier) (Perciformes: Latidae) from Okinawa-jima Island, Japan

Description of two new species of Diplectanum Diesing, 1858 (Monogenea: Diplectanidae) collected from Protonibea diacanthus (Lacepède, 1802) (Teleostei: Sciaenidae) from waters off northern Australia

Two new species of the family Diplectanidae Monticelli, 1903 from the gills of Protonibea diacanthus (Lacepède, 1802) (Teleostei: Sciaenidae) off the northern Australian coast are described. Previous studies have either morphological or genetic results, whereas this study combines morphological and advanced molecular methods to provide the first detailed descriptions for species of Diplectanum Diesing, 1858 from Australia utilising both methodologies. Two new species, Diplectanum timorcanthus n. sp. and Diplectanum diacanthi n. sp., are morphologically described and genetically characterised using the partial nuclear 28S ribosomal RNA gene (28S rRNA) and the internal transcribed spacer 1 (ITS1) partial sequence.

Capsalids (Platyhelminthes: Monogenea) from marine fishes off Okinawa in Japan with the proposal of two new genera

Molecular studies of the Capsalidae suggested that the genus Benedenia is polyphyletic, but a taxonomic organization of the genus that reflects molecular data has not yet been proposed. As a result of molecular analysis (28S rDNA, ITS1-5.8S-ITS2, and cox1 data) including specimens of Benedeniinae newly obtained from Okinawa-jima Island in Japan, two new genera and the revival of Tareenia independent to the genus Benedenia are proposed. Gracilobenedenia n. gen. is distinguished from the other genera of Benedeniinae based on morphological characteristics. This new genus comprises 6 species: G. lutjani n. comb. (type species), G. anticavaginata n. comb., G. rohdei n. comb., G. beverleyburtonae n. comb., G. kuremibai n. gen., n. sp., and G. hichi n. gen., n. sp. Armatobenedenia n. gen. is a monotypic genus for A. armata n. comb. The present molecular phylogenetic analysis showed the independence of Tareenia, and it can be morphologically separated from the other benedeniines. Four species including two new species obtained from Okinawa-jima Island are reported: G. kuremibai n. sp., G. hichi n. sp., G. lutjani n. comb., and Metabenedeniella parva. Furthermore, in the species identification and phylogenetic analysis of capsalids, the usefulness of not only the 28S rDNA but also ITS and the cox1 regions was suggested. These genes were evaluated the efficacy of those regions in DNA barcoding, and the ITS and cox1 regions shown to be useful for DNA barcoding in capsalids compared to the 28S rDNA sequence.

Lamellodiscus (Monogenea: Diplectanidae) species parasitic on Japanese Acanthopagrus Peters, with proposals of L. chin n. sp. infecting A. sivicolus Akazaki and L. egusai nom. nov. for L. japonicus Ogawa & Egusa, 1978, a junior homonym of L. japonicus Pillai & Pillai, 1974

Lamellodiscus chin n. sp. (Monogenea: Diplectanidae) was described from Acanthopagrus sivicolus Akazaki (Perciformes: Sparidae) in Okinawa-jima Island, Ryukyu Islands based on morphological and molecular data. This new species resembles L. spari and L. elegans in morphologically but differs by its accessory piece curving and widening toward the tip. Three species of Lamellodiscus (L. japonicus Ogawa & Egusa, 1978, L. takitai Ogawa & Egusa, 1978, and L. spari Zhukov, 1970) were recorded from A. schlegelii (Bleeker), and L. japonicus was collected from A. latus (Houttuyn) in the Seto Inland Sea, Japan. I herein propose Lamellodiscus egusai nom. nov. for L. japonicus which is a junior primary homonym of L. japonicus Pillai & Pillai, 1974. Based on the type specimens and newly collected specimens from wild hosts, the type localities of L. japonicus (= L. egusai nom. nov.) and L. takitai are discussed. In addition, a list of nominal species of Japanese diplectanids is provided.