Copepods

Figure 2.Pseudodiaptomus siamensis, sp. n., female (holotype). A habitus, dorsal view B habitus, lateral view C rostrum, ventral view D right antennule, arabic numerals denote segment numbers E right antenna F mandible G maxilla.

Figure 6.Eucyclops angeli sp. n. Holotype from grassland in San Cristóbal de las Casas, Chiapas. A Antennule B Antenna, caudal C Antenna, frontal D Labrum E Mandible F Maxillule, palp separated G Maxilla, proximal and distal endites of the coxa, separated H Maxilliped, frontal. Scale bar 50 µm.

Figure 11.Stenhelia taiae Mu & Huys, 2002, line drawings, female: A labrum, posterior B paragnaths, anterior C maxillula, posterior D maxillar basis and endopod, posterior E maxilliped, posterior. Arrowhead indicates morphological character different from that in Stenhelia pubescens Chislenko, 1978.

Figure 1.Live coloration of the host nudibranchs and the splanchnotrophids. A Hypselodoris festiva infected by an ovigerous specimenof Certosomicola japonica sp. n. B an egg sac of Ceratosomicola japonica sp. n. and the gill circle of Hypselodoris festiva with the mantle malformed into an elongate tube C Thecacera pennigera infected by an ovigerous specimen of Splanchnotrophus helianthus sp. n. D Trapania pennigera with the mantle removed to show a female specimen of Splanchnotrophus helianthus on the visceral sac E Trapania miltabrancha infected by an ovigerous specimen of Splanchnotrophus imagawai sp. n (photo by K. Imagawa) F gill circle of Trapania miltabrancha with egg sacs of Splanchnotrophus imagawai sp. n. (photo by K. Imagawa) G Roboastra luteolineata infected by an ovigerous specimen of Majimun shirakawai gen. et sp. n. (photo by N. Shirakawa) H female Majimun shirakawai gen. et sp. n. with dwarf male attached to the posterior part of the body. Scale bars = 5 mm in A; 1 mm in B, D, H.

Figure 12.Diacyclops parasuoensis sp. n., A–B holotype female C–D allotype male. A fourth swimming leg, anterior view B fifth leg, anterior view C urosome, ventral view D cephalothorax, dorsal view. Arabic numerals indicating sensilla and pores presumably homologous to those in Diacyclops ishidai sp. n. Arrows pointing most prominent specific features. Scale bars 100 μm.

Figure 5.SEM micrograph of ventral side of genital double-somite of female Pseudodiaptomus siamensis, showing blunt process anterior to genital area.

Figure 7.Eucyclops angeli sp. n. Holotype from grassland in San Cristóbal de las Casas, Chiapas. A P1, frontal B Coxa of P1, caudal C P2, frontal, Exp separated D Coxa of P2, caudal E Intercoxal sclerite of P2, caudal F Exp3P3 G Coxa of P3, caudal H Coxa, basis, and intercoxal sclerite of P3, frontal I Intercoxal sclerite P3, caudal J P4, caudal; exopod and coxal spine separated K Intercoxal sclerite of P4, frontal. Scale bar 50 µm.

Figure 12.Stenhelia taiae Mu & Huys, 2002, line drawings, female: A first leg, anterior B third endopodal segment of second leg, anterior C basis and first endopodal segment of third leg, anterior D coxa and basis of fourth leg, anterior E third endopodal segment of fourth leg, anterior F fifth leg, dissected and flattened, anterior. Arrowheads indicate morphological characters different from those in Stenhelia pubescens Chislenko, 1978.

Figure 2.Ceratosomicola japonica sp. n., female, holotype NSMT–Cr 22240 (A–C), female, paratype NSMT–Cr 22243 (D–F). A habitus dorsal B habitus, ventral, p1 = leg 1, p2 = leg 2 C posterior portion of body, ventral D urosome, ventral E caudal ramus, ventral F egg sac. Scale bars = 1 mm in A, B; 300 μm in C; 100 μm in D; 10 μm in E; 500 μm in F.

Figure 13.Diacyclops parasuoensis sp. n., allotype male: A habitus, dorsal view B urosome, lateral view C antennula, flattened and slightly uncoiled, ventral view D sixth leg, ventro-lateral view. Arabic numerals indicating sensilla and pores presumably homologous to those in Diacyclops ishidai sp. n. Roman numerals indicating pores not present in Diacyclops ishidai sp. n. Arrows pointing most prominent specific features. Scale bars 100 μm.

Figure 1.Sampling stations in Prasae River Estuary, Rayong Province.

Figure 8.Eucyclops angeli sp. n. A–B paratype C–F allotype from grassland in San Cristóbal de las Casas, Chiapas. A Habitus, dorsal B Third, and fourth prosomites, lateral C First to fourth urosomites, lateral D Anal somite and caudal ramus, dorsal E Antennule, last two segments separated F Antenna, caudal G Antenna, frontal. Scale bars 50 µm.

Figure 3.Ceratosomicola japonica sp. n., female, holotype NSMT–Cr 22240 (A–G), female, paratype NSMT–Cr 22243 (H), female, paratype NSMT–Cr 22242 (I). A cephalosome, anterior portion. ventral B antennule, anterior C antenna D mandible E maxilla F leg 1 G leg 2 H, leg 2 (drawn from a paratype, NSMT–Cr 22243) I leg 3. Scale bars = 100 μm in A; 20 μm in B; 30 μm in C, G, H; 10 μm in D, I; 50 μm in E, F.

Figure 26.Scanning electron micrographs, A–C Diacyclops ishidai sp. n. D–E Diacyclops parasuoensis sp. n. F Diacyclops suoensis Ito, 1954: A anal somite and caudal rami, dorsal view, paratype female 1 B preanal and anal somites, lateral view, paratype female 2 C last two exopodal segments of second swimming legs, lateral view, paratype female 2 D anal somite and caudal rami, lateral view, paratype female E sixth leg, lateral view, paratype female F labrum and maxillulae, ventral view. Scale bars 20 μm (A, B, D, F) and 10 μm (C, E).

Figure 3.Pseudodiaptomus siamensis, sp. n., female (holotype). A maxillule B maxilliped C leg 1, posterior view D leg 2, posterior view E leg 3, anterior view F leg 4, posterior view G leg 5, posterior view.

Figure 10.Eucyclops festivus Lindberg, 1955; from pond 3 to Laguna Montebello, Chiapas. A First urosomite, and genital double-somite, ventral B Urosome, ventral C Anal somite and caudal ramus, ventral D Urosome, ventral E Anal somite and caudal ramus, ventral. Scale bars 50 µm. A–C female; D–E male.

Figure 4.Ceratosomicola japonica sp. n., male, allotype NSMT–Cr 22241. A habitus, dorsal B habitus, ventral, p1 = leg 1, p2 = leg 2 C habitus, lateral D free thoracic somites and abdomen, ventral, p3 = leg 3 E caudal ramus, dorsal F maxilla G leg 1 H leg 2 I leg 3. Scale bars = 500 μm in A, B, C; 200 μm in D; 10 μm in E, I; 20 μm in F, G; 30 μm in H.

Figure 27.Light photograph of four sympatric Korean species of the Diacyclops/Acanthocyclops complex from Seomjin River: A Acanthocyclops sensitivus (Graeter & Chappuis, 1914), two adult females B Diacyclops languidoides s.l. (Lilljeborg, 1901), two adult females C Diacyclops parasuoensis sp. n., two adult females D Diacyclops hanguk sp. n., two adult females.

Figure 4.Pseudodiaptomus siamensis, sp. n., male (allotype). A habitus, lateral view B habitus, dorsal view C right antennule, arabic numerals denote segment numbers D leg 5, anterior view E leg 5, posterior view F anterior view of exopod of right leg 5 G posterior view of inner process and outer process of endopod of left leg 5.

Figure 11.Eucyclops festivus Lindberg, 1955; from pond 3 to Laguna Montebello, Chiapas. A Antenna, frontal B Antenna, caudal C Antenna, frontal D Antenna, caudal E Coxa, basis, and intercoxal sclerite of P1, frontal F P4, caudal, Exp, and one inner seta separated G Coxa, basis, and intercoxal sclerite of P4, caudal. Scale bars 50 µm. A, B, E, F female; C, D, G male.

Figure 1.Live coloration of the host nudibranchs and the splanchnotrophids. A Hypselodoris festiva infected by an ovigerous specimenof Certosomicola japonica sp. n. B an egg sac of Ceratosomicola japonica sp. n. and the gill circle of Hypselodoris festiva with the mantle malformed into an elongate tube C Thecacera pennigera infected by an ovigerous specimen of Splanchnotrophus helianthus sp. n. D Trapania pennigera with the mantle removed to show a female specimen of Splanchnotrophus helianthus on the visceral sac E Trapania miltabrancha infected by an ovigerous specimen of Splanchnotrophus imagawai sp. n (photo by K. Imagawa) F gill circle of Trapania miltabrancha with egg sacs of Splanchnotrophus imagawai sp. n. (photo by K. Imagawa) G Roboastra luteolineata infected by an ovigerous specimen of Majimun shirakawai gen. et sp. n. (photo by N. Shirakawa) H female Majimun shirakawai gen. et sp. n. with dwarf male attached to the posterior part of the body. Scale bars = 5 mm in A; 1 mm in B, D, H.

Figure 14.Diacyclops suoensis Ito, 1954, female: A habitus, dorsal view B antennula, ventral view C antenna, ventral view. Arrows pointing most prominent specific features. Scale bars 100 μm.

Figure 5.Splanchnotrophus helianthus sp. n., female, holotype NSMT–Cr 22244. A habitus, dorsal A’ enlarged view of egg sac B habitus, ventral, p1 = leg 1, p2 = leg 2 C posterior portion of body, ventral, p3 = leg 3 D fourth pedigerous somite and genito-abdomen, ventral E caudal ramus, dorsal F cephalosome, ventral. Scale bars = 1 mm in A; 100 μm in A’; 500 μm in B; 200 μm in C, F; 100 μm in D; 20 μm in E.

Figure 15.Diacyclops suoensis Ito, 1954, female: A urosome, dorsal view B urosome, lateral view C urosome, ventral view. Arabic numerals indicating sensilla and pores presumably homologous to those in Diacyclops ishidai sp. n. Arrows pointing most prominent specific features. Scale bar 100 μm.