Some new and known species of the Lernanthropidae (Copepoda, Siphonostomatoida) parasitic on the branchial lamellae of Japanese actinopterygian fishes, with revision of two known species of the family and discussion on the insemination mode in the Siphonostomatoida

Abstract

Ten species of Lernanthropidae parasitic on the branchial lamellae of Japanese marine actinopterygian fishes are (re-)described herein. These are: Lernanthropinus carangoides sp. nov., recovered from Carangoides equula (Carangidae), Lernanthropinus labracoglossae sp. nov. from Labracoglossa argentiventris (Kyphosidae), Lernanthropsis mugilii (Shishido, 1898) from Mugil cephalus (Mugilidae), Lernanthropus atrox Heller, 1865 from Pagrus major (Sparidae), Lernanthropus erythrocles sp. nov. from Erythrocles schlegelii (Emmelichthyidae), Lernanthropus incilis Ho, Liu & Lin, 2011 from Evoxymetopon poeyi (Trichiuridae), Lernanthropus seriolae Shishido, 1898 from Seriola lalandi (Carangidae), Lernanthropus talipes Wilson, 1935 from Girella punctata and Kyphosus vaigiensis (Kyphosidae), Sagum paracaesionis sp. nov. from Paracaesio xanthurus (Lutjanidae), and a Lernanthropidae sp. (male) from Parapristopoma trilineatum (Haemulidae). Lernanthropus senegalensis Diebakate & Raibaut, 1996 is transferred to the genus Lernanthropinus. Lernanthropus pristipomoides Kirtisinghe, 1937 is relegated to a junior synonym of L. talipes. The possession of the naked first antennular segment is verified for all lernanthropids herein dealt with, in both sexes. The parabasal flagellum characteristic for the family is regarded as homologous with the postantennal process that is very common among siphonostomatoids parasitic on fishes. Two different modes of insemination exist in the Siphonostomatoida. The Lernanthropidae and Eudactylinidae differ from the Caligidae and Pandalidae in their mode of insemination.