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Fig. 2 in A new species of the snake eel genus Ophichthus from Vietnam, with a new record of Echelus polyspondylus McCosker & Ho, 2015

Fig. 2. Drawing demonstrating the head pores (A) and teeth on both jaw (B, C) of Ophichthus longicorpus, new species. A, B, from the holotype; C, from NMMB-P34715, 562 mm TL.

Fig. 1 in Uropterygius cyamommatus, a new moray eel (Anguilliformes: Muraenidae) from anchialine caves in Christmas Island, Australia, and Panglao Island, the Philippines

Fig. 1. Sampling map of Uropterygius cyamommatus, new species. Star for the holotype; circles for paratypes and non-type specimens; red symbols for specimens from Christmas Island; yellow symbol for specimens from Panglao Island.

Fig. 4 in Uropterygius cyamommatus, a new moray eel (Anguilliformes: Muraenidae) from anchialine caves in Christmas Island, Australia, and Panglao Island, the Philippines

Fig. 4. Uropterygius cyamommatus, new species, lateral view of head marked with cephalic sensory pores: red for supraorbital pores; green for infraorbital pores; blue for preoperculo-mandibular pores; yellow for the branchial pore. Arrow indicates the gill opening. Photo of WAM P.35403.001, holotype, 361 mm TL (photographed by HHT).

Fig. 6 in Uropterygius cyamommatus, a new moray eel (Anguilliformes: Muraenidae) from anchialine caves in Christmas Island, Australia, and Panglao Island, the Philippines

Fig. 6. Dentition of Uropterygius cyamommatus, new species, holotype, WAM P.35403.001. Upper jaw (left) and lower jaw (right). Dotted circles represent the sockets of missing teeth. Schematic drawings by WCH.

Fig. 5 in Uropterygius cyamommatus, a new moray eel (Anguilliformes: Muraenidae) from anchialine caves in Christmas Island, Australia, and Panglao Island, the Philippines

Fig. 5. Uropterygius cyamommatus, new species, lateral view of the head region of a specimen without the left eye. A, external view; B, radiograph showing the skeletal structure of orbital region. Photo of NMMB-P37200, paratype, 380 mm TL (photographed by HHT).

Fig. 3 in Uropterygius cyamommatus, a new moray eel (Anguilliformes: Muraenidae) from anchialine caves in Christmas Island, Australia, and Panglao Island, the Philippines

Fig. 3. Uropterygius cyamommatus, new species, holotype, WAM P.35403.001, 361 mm TL. A, fresh colouration (photographed by HHT); B, preserved colouration (photographed by WCH). Arrows indicate the position of anus.

Fig. 7 in Uropterygius cyamommatus, a new moray eel (Anguilliformes: Muraenidae) from anchialine caves in Christmas Island, Australia, and Panglao Island, the Philippines

Fig. 7. Radiograph showing the skeletal structure of Uropterygius cyamommatus, new species, ZRC 46849-1, 352 mm TL (photographed by HHT). Arrow indicates the position of anus.

Fig. 14. Ascarophis arctica Polyanskiy, 1952 from Gasterosteus aculeatus Linnaeus, scanning electron micrographs. A in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 14. Ascarophis arctica Polyanskiy, 1952 from Gasterosteus aculeatus Linnaeus, scanning electron micrographs. A – posterior end of male, ventral view; B – tail of male, subventral view (arrows indicate postanal papillae); C – precloacal region, subventral view (arrows indicate preanal papillae; note weakly-developed ventral precloacal ridges); D – posterior end of male, sublateral view (arrows indicate two posteriormost pairs of postanal papillae; note ventral precloacal ridges); E – broken female body with eggs; F – egg with filaments on both poles; G – egg with filaments only on one pole.

Fig. 11. Rhabdochona zacconis Yamaguti, 1935 in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 11. Rhabdochona zacconis Yamaguti, 1935 from Tribolodon hakonensis (Günther), scanning electron micrographs. A, B – cephalic end of male, subapical and apical views, respectively (arrows indicate sublabia); C – deirid; D – tail of male, lateral view (arrow indicates cloaca); E – eggs dissected out from uterus; F – eggs with polar filaments. Abbreviations: a – cephalic papilla; b – amphid.

Fig. 13. Ascarophis arctica Polyanskiy, 1952 from Gasterosteus aculeatus Linnaeus, scanning electron micrographs. A–C in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 13. Ascarophis arctica Polyanskiy, 1952 from Gasterosteus aculeatus Linnaeus, scanning electron micrographs. A–C – cephalic end of female, lateral, apical and dorsoventral views, respectively; D – region of female mouth (another specimen), sublateral view; E – tail of female, ventral view; F – deirid; G – distal end of left spicule, ventral view. Abbreviations: a – amphid; b – cephalic papilla c – phasmid; d – anus; l – labium; p – pseudolabium with anterior tooth-like projection; s – sublabium.

Fig. 10 in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 10. Rhabdochona angusticaudata sp. n. from Anguilla japonica Temminck et Schlegel, scanning electron micrographs. A, B – anterior end of female body, sublateral and dorsoventral views (arrow indicates deirid); C – tail of male, lateral view; D – region of male tail with last postanal papilla and phasmid, lateral view; E – tail of gravid female, ventral view; F – vulva of gravid female, ventral view. Abbreviations: e – cloacal aperture; h – caudal papilla of last postanal pair; i – phasmid; k – anus.

Fig. 7. Heliconema anguillae Yamaguti, 1935 in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 7. Heliconema anguillae Yamaguti, 1935 from Anguilla japonica Temminck et Schlegel, scanning electron micrographs. A, B – cephalic end, subapical views (arrow indicates amphid); C – tail of male, sublateral view; D – ventral precloacal ridges and first two pairs of preanal papillae, ventral view; E – tail of male, ventral view; F – tail tip of male, ventral view (arrows indicate phasmids). Abbreviations: a – cephalic papilla; b – submedian tooth; c – lateral tooth; d – pseudolabial lateroterminal depression; e – cloacal aperture; f – papillae of first two preanal pairs; g – small ventral postanal papilla.

Fig. 8 in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 8. Rhabdochona angusticaudata sp. n. from Anguilla japonica Temminck et Schlegel. A – anterior part of male body, lateral view; B, C – anterior end of male, dorsoventral and lateral views, respectively; D – cephalic end of female, lateral view; E – cephalic end of male, apical view; F – deirid; G, H – distal end of left spicule (different specimens), lateral views; I – egg; J – female tail, lateral view; K – right spicule, lateral view; L – posterior end of male, lateral view; M – tail tip of female.

Fig. 2 in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 2. Hysterothylacium haze (Machida, Takahashi et Masuuchi, 1978) from Acanthogobius flavimanus (Temminck et Schlegel), scanning electron micrographs. A – anterior end of female with distinct lateral alae, dorsal view; B – cephalic end, apical view; C – dorsal lip; D – subventral lip; E – caudal end of male, lateral view (arrow indicates double papilla); F – distribution of papillae on caudal end, lateral view (another specimen; arrow indicates double papilla); G – posterior end of male, ventral view. Abbreviations: a – double cephalic papilla; b – single cephalic papilla; d – dorsal lip; e – amphid; i – interlabium; s – spicule.

Fig. 6 in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 6. Paraquimperia tenerrima (von Linstow, 1878) from Anguilla anguilla (Linnaeus), Czech Republic, scanning electron micrographs of mouth. A – apical view; B – subdorsal view. Abbreviations: a – amphid; b – cephalic papilla; c – two tooth-like structures of neighbouring sectors of mouth mound; d – oesophageal tooth.

Fig. 9 in Rhabdochona angusticaudata sp. n. (Nematoda: Rhabdochonidae) from the Japanese eel Anguilla japonica, and new records of some other nematodes from inland fishes in Japan

Fig. 9. Rhabdochona angusticaudata sp. n. from Anguilla japonica Temminck et Schlegel, scanning electron micrographs. A – cephalic end of male, lateral view; B – cephalic end of female, apical view; C – cephalic end of male, apical view; D – mouth region of female, apical view (arrow indicates sublabium); E – cephalic end of male (another specimen) with more numerous (16) anterior teeth, apical view; F – deirid. Abbreviations: a – amphid; b – cephalic papilla.