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

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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.

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

in Crustaceana

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References

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Figures

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    Lernanthropinus carangoides sp. nov., female. A, habitus, specimen attached to the branchial lamella of its host, lateral; B, same, dorsal; C, same, ventral. Scale bar: 1 mm for A-C.

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    Lernanthropinus carangoides sp. nov., female. A, antennule, dorsal; B, antenna, posterior; C, mouthparts, ventral; D, maxilla, ventral; E, maxilliped, anterior; F, urosome, dorsal; G, caudal ramus, dorsal; H, leg 1, ventral; I, leg 2, ventral; J, leg 4, dorsal. Abbreviations: ap, adhesion pad; md, mandible; mx1, maxillule; oc, oral cone; p5, leg 5. Scale bars: 1 mm for J; 0.3 mm for F; 0.2 mm for B; 0.1 mm for C-E, G-I; 0.05 mm for A.

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    Lernanthropinus carangoides sp. nov., male. A, habitus, specimen attached to the branchial lamella of its host, lateral; B, same, dorsal; C, antennule and postantennal process, ventral; D, antenna, ventral; E, mouthparts, ventral; F, maxilla, ventral; G, maxilliped, ventral; H, caudal ramus, dorsal; I, leg 1, ventral; J, leg 2, ventral. Additional abbreviation: pap, postantennal process. Scale bars: 0.5 mm for A, B; 0.2 mm for D; 0.1 mm for E-J; 0.05 mm for C.

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    Lernanthropinus carangoides sp. nov. A, E-G, copepodid IV female. A, body, dorsal; E, antenna, ventral; F, leg 1, ventral; G, leg 2, ventral. B-D, copepodid V female. B, body, lateral; C, antennule, ventral; D, distal two antennular segments, ventral. Scale bars: 0.5 mm for A, B; 0.1 mm for E; 0.05 mm for C, F, G; 0.03 mm for D.

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    Lernanthropinus labracoglossae sp. nov., female. A, habitus, dorsal; B, same, ventral; C, same with leg 4 omitted, lateral; D, egg sac; E, cephalothorax, ventral; F, urosome, dorsal; G, leg 3 and dorsal plate, ventral; H, leg 4, dorsal. Additional abbreviations: dp, dorsal plate; en, endopod; ex, exopod; sp, spermatophore. Scale bars: 1 mm for A-D; 0.5 mm for E, G, H; 0.3 mm for F.

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    Lernanthropinus labracoglossae sp. nov., female. A, antennule, ventral; B, antenna, posterior; C, postantennal process and adjacent structure; D, mouthparts, ventral; E, maxillule, ventral; F, maxilla, ventral; G, maxilliped, anterior; H, leg 1, ventral; I, leg 2, ventral. Additional abbreviations: a1, antennule; a2, antenna. Scale bar: 0.2 mm for B, G; 0.1 mm for C-F, H, I.

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    Lernanthropinus labracoglossae sp. nov., male. A, habitus, dorsal; B, caudal ramus, ventral; C, antennule and postantennal process, ventral; D, distal two antennular segments, ventral; E, antenna, posterior; F, oral cone and mandible, ventral; G, maxilulle, ventral; H, maxilla, ventral; I, maxilliped, anterior; J, leg 1, ventral; K, leg 2, ventral; L, basal portion of legs 3 and 4, ventral; M, tip of leg 3, ventral; N, tip of leg 4, ventral. Scale bars: 0.5 mm for A; 0.3 mm for L; 0.1 mm for I-K; 0.05 mm for B, C, G, H, M, N.

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    Lernanthropinus labracoglossae sp. nov. A-C, copepodid V female. A, body, with cephalothorax missing, ventral; B, caudal ramus, ventral; C, leg 2, ventral. D-G, copepodid V male. D, body, ventral; E, antennal area of cephalothorax, dorsal; F, leg 1, ventral; G, leg 2, ventral. Scale bars: 0.3 mm for A, D; 0.1 mm for E-G; 0.05 mm for B, C.

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    Lernanthropsis mugilii (Shishido, 1898), female. A, habitus, dorsal; B, same, ventral; C, urosome, ventral; D, caudal ramus, dorsal; E, antennule, ventral; F, distal three antennular segments, ventral; G, antenna, ventral; H, mouthparts, ventral; I, maxilla, ventral; J, maxilliped, ventral; K, leg 1, ventral; L, leg 2, ventral. Scale bars: 1 mm for A, B; 0.3 mm for C; 0.2 mm for G, J; 0.1 mm for D, E, H, I, K, L; 0.03 mm for F.

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    Lernanthropus atrox Heller, 1865, female. A, habitus, dorsal; B, same, ventral; C, antennule, ventral; D, antenna and adjacent structure, ventral; E, mouthparts, ventral; F, maxilla, ventral; G, maxilliped, ventral; H, urosome, ventral; I, insemination, dorsal; J, caudal rami, ventral; K, leg 1, ventral; L, leg 2, ventral; M, leg 4, ventral. Additional abbreviations: sps, spermatophore sheath; st, spermatophore tubule. Scale bars: 1 mm for A, B; 0.5 mm for M; 0.3 mm for H; 0.2 mm for D; 0.1 mm for E-G, I-L; 0.05 mm for C.

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    Lernanthropus erythrocles sp. nov., female. A, habitus, dorsal; B, same, lateral; C, same, ventral; D, urosome, dorsal; E, antennule, ventral; F, distal three antennular segments, ventral; G, mouthparts, ventral; H, maxilla, ventral; I, maxilliped, ventral; J, leg 1, ventral; K, leg 2, ventral; L, leg 2 rami, ventral. Scale bars: 2 mm for A-C; 0.3 mm for D; 0.2 mm for L; 0.1 mm for E, G-J; 0.05 mm for L; 0.02 mm for F.

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    Lernanthropus incilis Ho, Liu & Lin, 2011, female. A, habitus, dorsal; B, same, ventral; C, same with leg 4 omitted, lateral; D, antennule, ventral; E, antenna, ventral; F, urosome, dorsal; G, mouthparts, ventral; H, maxilla, ventral; I, maxilliped, ventral; J, leg 1, ventral; K, leg 2, ventral. Additional abbreviation: gp, gonopore. Scale bars: 1 mm for A-C, F; 0.2 mm for D, E, I-K; 0.1 mm for G.

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    Lernanthropus incilis Ho, Liu & Lin, 2011, male. A, habitus, dorsal; B, antennule, ventral; C, antenna, ventral; D, mouthparts, ventral; E, maxilla, ventral; F, maxilliped, ventral; G, leg 1, ventral; H, leg 2, ventral. Scale bars: 1 mm for A; 0.2 mm for B, C, F; 0.1 mm for D, E, G, H.

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    Lernanthropus seriolae Shishido, 1898, female. A, habitus, having right leg 4 with rami abnormally fused into one, dorsal; B, same, lateral; C, same, ventral; D, leg 3, lateral; E, leg 4, ventral; F, urosome, dorsal; G, antennule and postantenal process, dorsal; H, antenna, ventral; I, mouthparts, ventral; J, maxilla, ventral; K, maxilliped, ventral; L, leg 1, ventral; M, leg 2, ventral. Scale bars: 2 mm for A-C; 1 mm for E, F; 0.5 mm for D; 0.2 mm for H; 0.1 mm for G, I-M.

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    Lernanthropus seriolae Shishido, 1898, male. A, habitus, dorsal; B, antennule, ventral; C, antenna, ventral; D, mouthparts, ventral; E, maxilla, ventral; F, maxilliped, anteroventral; G, abdomen and caudal rami, dorsal; H, leg 3, ventral; I, leg 1, ventral; J, leg 2, ventral. Scale bars: 1 mm for A; 0.3 mm for H; 0.2 mm for C, G; 0.1 mm for D-F, I, J.

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    Lernanthropus talipes Wilson, 1935, female. A, habitus, dorsal; B, same, ventral; C, same, attached to the branchial lamella of its host, lateral. Scale bars: 1 mm for A-C.

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    Lernanthropus talipes Wilson, 1935, female. A, urosome carrying spermatophores attached to copulatory pores, ventral; B, antennule, ventral; C, antenna and postantennal process, medioventral; D, mouthparts, ventral; E, maxilla, ventral; F maxilliped, posterior; G, leg 1, ventral; H, leg 2, ventral; I, leg 4, ventral. Scale bar: 0.5 mm for I; 0.3 mm for A; 0.1 mm for C-H; 0.05 mm for B.

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    Lernanthropus talipes Wilson, 1935. A-L, male. A, habitus, dorsal; B, caudal ramus, dorsal; C, antennule, ventral; D, antenna and postantenal process, ventral; E, mouthparts, ventral; F, maxilla, ventral; G, maxilliped, ventral; H, subchela of same, dorsal; I, leg 1, ventral; J, leg 2, ventral; K, leg 3, ventral; L, leg 4, dorsal. M, copepodid IV female, dorsal. N, copepodid V female, dorsal. Scale bars: 1 mm for A, M, N; 0.5 mm for L; 0.3 mm for K; 0.2 mm for D; 0.2 mm for G, H; 0.1 mm for B, E, F, I, J; 0.05 mm for C.

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    Sagum paracaesionis sp. nov., female. A, habitus, dorsal; B, same, specimen attached to the branchial lamella of its host, ventrolateral; C, same, ventral. Scale bar: 1 mm for A-C.

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    Sagum paracaesionis sp. nov., female. A, antennule, ventral; B, antenna and postantennal process, ventral; C, mouthparts, ventral; D, egg sac; E, leg 3, ventral; F, leg 4, ventral; G, urosome and caudal rami, dorsal; H, maxilliped, ventral; I, legs 1 and 2, ventral. Additional abbreviations: mx2, maxilla; p1, leg 1; p2, leg 2. Scale bars: 0.5 mm for D-F; 0.3 mm for G; 0.2 mm for B, H; 0.1 mm for C, I; 0.05 mm for A.

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    Lernanthropidae sp., male. A, habitus, dorsal; B, antennule and postantennal process, ventral; C, distal three antennular segments, ventral; D, antenna, posterior; E, mouthparts, ventral; F, mandible, ventral; G, caudal ramus, ventral; H, maxilla, ventral; I, maxilliped, anterior; J, leg 1, ventral; K, leg 2, ventral. Scale bars: 0.5 mm for A; 0.1 mm for D, I; 0.05 mm for B, E-H, J, K.

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