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Fig. 4 in Synonymy of the Scale Worm Hesperonoe urechis with Arctonoella sinagawaensis (Annelida: Polynoidae), Newly Recorded from the Seto Inland Sea, Western Japan, with Remarks on Symbiosis with the Spoon Worm Urechis unicinctus (Annelida: Thalassematidae)

Fig. 4. Arctonoella sinagawaensis. Frontal margin of prostomium, preserved specimens (A: NSMT-Pol 113484; B: NSMT-Pol 113479; C: NSMT-Pol 113483; D: NSMT-Pol 113482; E: NSMT-Pol 113481; F: NSMT-Pol 113480). A, B, Lacking cephalic peaks; C–E, intermediate forms having round or slightly tapering protrusions; F, presence of typical tapering peaks. Scale bars: 0.1 mm.

Fig. 3 in Synonymy of the Scale Worm Hesperonoe urechis with Arctonoella sinagawaensis (Annelida: Polynoidae), Newly Recorded from the Seto Inland Sea, Western Japan, with Remarks on Symbiosis with the Spoon Worm Urechis unicinctus (Annelida: Thalassematidae)

Fig. 3. Arctonoella sinagawaensis, preserved specimens (A, C: NSMT-Pol 113479; B: NSMT-Pol 113481; D: NSMT-Pol 113480). A, Anterior end, dorsal view; B, anterior end, ventral view. C, posterior end, with last smallest elytron on segment 33 (white arrow), dorsal view; D, midbody with largest elytra, dorsal view. Abbreviations: ac, anal cirrus; dc, dorsal cirrus; la, lateral antenna; ma, median antenna; pa, palp; pr, proboscis; tc, tentacular cirrus; vbc, ventral buccal cirrus; 2–4, segments 2–4. Scale bars: 1 mm.

Fig. 2. Arctonoella sinagawaensis. A–D in Synonymy of the Scale Worm Hesperonoe urechis with Arctonoella sinagawaensis (Annelida: Polynoidae), Newly Recorded from the Seto Inland Sea, Western Japan, with Remarks on Symbiosis with the Spoon Worm Urechis unicinctus (Annelida: Thalassematidae)

Fig. 2. Arctonoella sinagawaensis. A–D, Living specimens (A, B: NSMT-Pol 113479; C, D: NSMT-Pol 113482) associated with Urechis unicinctus; E, preserved specimen (NSMT-Pol 113482). A, Ventral view; B, lateral view, tips of dorsal cirri in contact with host body (black arrows); C, dorsal view of a symbiont on its host (white arrow), just after being collected; D, dorsal view of symbiont in C, detached from its host; E, dorsal view. Scale bars: A, B, 10 mm; D, E, 5 mm.

Fig. 7 in Synonymy of the Scale Worm Hesperonoe urechis with Arctonoella sinagawaensis (Annelida: Polynoidae), Newly Recorded from the Seto Inland Sea, Western Japan, with Remarks on Symbiosis with the Spoon Worm Urechis unicinctus (Annelida: Thalassematidae)

Fig. 7. Reevaluation of numbers of pairs of elytra in photographs of living specimens (dorsal view) shown in previous studies. A, Holotype of Hesperonoe urechis (71 mm BL), modified from Marin and Antokhina (2020: fig. 8c); B, non-type specimen of H. urechis, modified from Marin and Antokhina (2020: figs 1e, 8a) and Buzhinskaja (2013: fig. E; shown as Hesperonoe sp.). 1–16: number of left elytra from anterior to posterior ends; brackets indicate elytron absent. Scale bar: 10 mm.

Fig. 1 in Synonymy of the Scale Worm Hesperonoe urechis with Arctonoella sinagawaensis (Annelida: Polynoidae), Newly Recorded from the Seto Inland Sea, Western Japan, with Remarks on Symbiosis with the Spoon Worm Urechis unicinctus (Annelida: Thalassematidae)

Fig. 1. Distribution of Arctonoella sinagawaensis. A, Japan and neighboring countries; B, Seto Inland Sea (western Japan). Closed circles, present study; open circles, previous studies. 1, mouth of Saba-gawa River, Yamaguchi Prefecture; 2, Mukaishima Island, Onomichi-shi, Hiroshima Prefecture; 3, Takasu-higata, Kurashikishi, Okayama Prefecture; a, Shinagawa, Tokyo Bay (type locality; Izuka 1912); b, Peter the Great Bay (Marin and Antokhina 2020); c, Possjet Bay (Buzhinskaja 1967; Marin and Antokhina 2020); d, Chefoo Bay, Yellow Sea (Fauvel 1933; Uschakov 1982).

Fig. 6 in Synonymy of the Scale Worm Hesperonoe urechis with Arctonoella sinagawaensis (Annelida: Polynoidae), Newly Recorded from the Seto Inland Sea, Western Japan, with Remarks on Symbiosis with the Spoon Worm Urechis unicinctus (Annelida: Thalassematidae)

Fig. 6. Arctonoella sinagawaensis, distal part of chaetae in chaetiger 14, preserved specimen (NSMT-Pol 113479). A, Superior notochaeta; B, inferior notochaeta; C, D, supra-acicular neurochaeta; E, infra-acicular neurochaeta. Scale bars: 0.1 mm.

Fig.ç6.Ec hinoderes ohtsukai sp. nov., holotype, male (ZIHU 3976), Nomarski photomicrographs. A, Segments 1 and 2, ventral view; B, segments 4 and 5, ventral view. Abbreviations: dss, droplet-shaped sensory spot; gco1, glandular cell outlet type I; gco2, modi ed glandular cell outlet type II; lvt, lateroventral tubule; pac, pachycyclus; pf, pectinate fringe; rss, rounded sensory spot. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç6.Ec hinoderes ohtsukai sp. nov., holotype, male (ZIHU 3976), Nomarski photomicrographs. A, Segments 1 and 2, ventral view; B, segments 4 and 5, ventral view. Abbreviations: dss, droplet-shaped sensory spot; gco1, glandular cell outlet type I; gco2, modi ed glandular cell outlet type II; lvt, lateroventral tubule; pac, pachycyclus; pf, pectinate fringe; rss, rounded sensory spot.

Fig.ç5.Ec hinoderes ohtsukai sp. nov., holotype, male (ZIHU 3976), Nomarski photomicrographs. A, Segments 1 and 2, dorsal view; B, segment 4, dorsal view. Abbreviations: dss, droplet-shaped sensory spot; gco1, glandular cell outlet type I; gco2, modi ed glandular cell outlet type II; mds, middorsal spine; pac, pachycyclus; pf, pectinate fringe; ps, perforation site; rss, rounded sensory spot. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç5.Ec hinoderes ohtsukai sp. nov., holotype, male (ZIHU 3976), Nomarski photomicrographs. A, Segments 1 and 2, dorsal view; B, segment 4, dorsal view. Abbreviations: dss, droplet-shaped sensory spot; gco1, glandular cell outlet type I; gco2, modi ed glandular cell outlet type II; mds, middorsal spine; pac, pachycyclus; pf, pectinate fringe; ps, perforation site; rss, rounded sensory spot.

Fig.ç7.Ec hinoderes ohtsukai sp. nov., paratype, female (ZIHU 3980), Nomarski photomicrographs. A, Segments 5 and 6, ventral view; B, segments 8 and 9, ventral view. Abbreviations: dss, droplet-shaped sensory spot; gco2, modi ed glandular cell outlet type II; lvt, lateroventral tubule; si, sieve plate; sp, sternal plate; tp, tergal plate. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç7.Ec hinoderes ohtsukai sp. nov., paratype, female (ZIHU 3980), Nomarski photomicrographs. A, Segments 5 and 6, ventral view; B, segments 8 and 9, ventral view. Abbreviations: dss, droplet-shaped sensory spot; gco2, modi ed glandular cell outlet type II; lvt, lateroventral tubule; si, sieve plate; sp, sternal plate; tp, tergal plate.

Fig.ç4.Ec hinoderes ohtsukai sp. nov., paratype, female (ZIHU 3983), scanning electron micrographs. A, Mouth cone, lateral view; B, introvert, lateral view. Abbreviations: oo, outer oral styles; sc, scalids; sp, spinoscalids; tr, trichoscalids. Digits a er the labels refer to introvert ring numbers. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç4.Ec hinoderes ohtsukai sp. nov., paratype, female (ZIHU 3983), scanning electron micrographs. A, Mouth cone, lateral view; B, introvert, lateral view. Abbreviations: oo, outer oral styles; sc, scalids; sp, spinoscalids; tr, trichoscalids. Digits a er the labels refer to introvert ring numbers.

Fig.ç3.Ec hinoderes ohtsukai sp. nov., scanning electron micrographs. A, B, Paratype, female (ZIHU 3983); C–E, paratype, male (ZIHU 3982). A, General habitus, lateral view; B, neck and segments 1–4, lateral view; C, enlargement of segment 7, lateral view; D, enlargement of segment 9, lateral view; E, enlargement of segments 10 and 11, lateroventral view. Abbreviations: ch, cuticular hair; dss, droplet-shaped sensory spot; gco2, modi ed glandular cell outlet type II; ldt, laterodorsal tubule; pf, pectinate fringe; po, pore; ps1, penile spine 1; ps2, penile spine 2; ps3, penile spine 3; rss, rounded sensory spot; si, sieve plate; ss, sensory spot. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç3.Ec hinoderes ohtsukai sp. nov., scanning electron micrographs. A, B, Paratype, female (ZIHU 3983); C–E, paratype, male (ZIHU 3982). A, General habitus, lateral view; B, neck and segments 1–4, lateral view; C, enlargement of segment 7, lateral view; D, enlargement of segment 9, lateral view; E, enlargement of segments 10 and 11, lateroventral view. Abbreviations: ch, cuticular hair; dss, droplet-shaped sensory spot; gco2, modi ed glandular cell outlet type II; ldt, laterodorsal tubule; pf, pectinate fringe; po, pore; ps1, penile spine 1; ps2, penile spine 2; ps3, penile spine 3; rss, rounded sensory spot; si, sieve plate; ss, sensory spot.

Fig.ç2.Ec hinoderes ohtsukai sp. nov., camera lucida drawings. A, B, Holotype, male (ZIHU 3976), entire animal, dorsal and ventral view, respectively; C, D, allotype, female (ZIHU 3977), segments 9–11, dorsal and ventral view, respectively. Abbreviations: dss, droplet-shaped sensory spot; gco1, glandular cell outlet type I; gco2, modi ed glandular cell outlet type II; ldt, laterodorsal tubule; lts, lateral terminal spine; lvt, lateroventral tubule; mds, middorsal spine; ne, neck; ps, penile spine; rss, rounded sensory spot; si, sieve plate. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç2.Ec hinoderes ohtsukai sp. nov., camera lucida drawings. A, B, Holotype, male (ZIHU 3976), entire animal, dorsal and ventral view, respectively; C, D, allotype, female (ZIHU 3977), segments 9–11, dorsal and ventral view, respectively. Abbreviations: dss, droplet-shaped sensory spot; gco1, glandular cell outlet type I; gco2, modi ed glandular cell outlet type II; ldt, laterodorsal tubule; lts, lateral terminal spine; lvt, lateroventral tubule; mds, middorsal spine; ne, neck; ps, penile spine; rss, rounded sensory spot; si, sieve plate.

Fig.ç1.M aps and photograph showing the sampling locality for Echinoderes ohtsukai sp. nov. A, Map of eastern Asia; B, enlargement of the rectangle in A; C, enlargement of the area indicated by the black circle in B; D, photograph of the sampling locality; white arrow indicates the Kamogawa River and dotted circle indicates the sampling site. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç1.M aps and photograph showing the sampling locality for Echinoderes ohtsukai sp. nov. A, Map of eastern Asia; B, enlargement of the rectangle in A; C, enlargement of the area indicated by the black circle in B; D, photograph of the sampling locality; white arrow indicates the Kamogawa River and dotted circle indicates the sampling site.

Fig.ç8.Ec hinoderes ohtsukai sp. nov., holotype, male (ZIHU 3976), Nomarski photomicrographs. A, Segments 10 and 11, dorsal view; B, segments 10 and 11, ventral view. Abbreviations: ldt, laterodorsal tubule; lts, lateral terminal spine; ps1, penile spine 1; ps2, penile spine 2. in A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

Fig.ç8.Ec hinoderes ohtsukai sp. nov., holotype, male (ZIHU 3976), Nomarski photomicrographs. A, Segments 10 and 11, dorsal view; B, segments 10 and 11, ventral view. Abbreviations: ldt, laterodorsal tubule; lts, lateral terminal spine; ps1, penile spine 1; ps2, penile spine 2.

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Fig. 3 in Rediscovery of a Deep-sea Fish Parasite Lophoura cornuta (Copepoda: Sphyriidae) in the Western North Pacific off Hokkaido, Northern Japan

Fig. 3. Lophoura cornuta, adult female, NSMT-Cr 31508. A, Habitus, ventrolateral view, ethanol-preserved specimen; B, cephalothorax and part of neck including holdfast organ, ventral view; C, D, anterior part of cephalothorax, ventrolateral and dorsolateral views, respectively. The specimen was fixed in 70% ethanol on 24 March 1983 and photographed on 9 October 2023. Abbreviations: c, cephalothorax; cp, conical protuberance; ho, holdfast organ; n, neck. Scale bars: A, 10 mm; B, 3 mm; C, D, 0.5 mm.

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Fig. 2 in Rediscovery of a Deep-sea Fish Parasite Lophoura cornuta (Copepoda: Sphyriidae) in the Western North Pacific off Hokkaido, Northern Japan

Fig. 2. Lophoura cornuta, adult female, NSMT-Cr 31509. A, Habitus, ventral view; B, C, cephalothorax and part of neck including holdfast organ, ventral and dorsal views, respectively; D, cephalothorax, anterior view. The trunks on the holdfast organ are individually numbered as 1, 2, 3, or 4 (B, C). Abbreviations: cp: conical protuberance; mo: mouth opening. Scale bars: A, 10 mm; B, C, 5 mm; D, 1 mm.

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Fig. 1 in Rediscovery of a Deep-sea Fish Parasite Lophoura cornuta (Copepoda: Sphyriidae) in the Western North Pacific off Hokkaido, Northern Japan

Fig. 1. Collection localities of Lophoura cornuta in the western North Pacific off the south coast of Hokkaido, northern Japan, in the previous (open circle) and present (closed circles) studies. Localities 1, 2, and 3 are: off Cape Ochiishi (type locality; Wilson 1919), off Cape Shirepa (this paper), and off Shin-Hidaka (this paper), respectively.

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FIG. 2 in Bathyal Rissoidae (Gastropoda: Rissooidea) off the Russian Far East coast of the Sea of Japan, with redescription of Punctulum reticulatum Golikov, 1986

FIG. 2. Species of Rissoidae. A. Punctulum akibai (Yokoyama, 1926), SoJaBio stn. A2-10 (455-456 m), MIBM 39336. B. Punctulum nihonkaiensis (Hasegawa, 2014), SoJaBio stn. A2-10 (455-456 m), MIBM 39337. C-D. Frigidoalvania asura (Yokoyama, 1926), SoJaBio stn. B7-7 (470-528 m), MIBM 39340. E-F. Frigidoalvania tanseimaruae Hasegawa, 2014, SoJaBio stn. B6-7 (1,001-1,011 m). G-J. Punctulum flavum (Okutani, 1964); G-H, "shallow-water form", SoJaBio stn. A2-10 (455-456 m), MIBM 14270; I-J, "deep-water form", SoJaBio stn. A6-7 (2,511-2,534 m), MIBM 39334. All at the same scale; scale = 1 mm. РИС. 2. Виды Rissoidae. A. Punctulum akibai (Yokoyama, 1926), SoJaBio ст. A2-10 (455-456 м), MIBM 39336.B. Punctulum nihonkaiensis (Hasegawa, 2014), SoJaBio ст. A2-10 (455-456 м), MIBM 39337. C-D. Frigidoalvania asura (Yokoyama, 1926), SoJaBio ст. B7-7 (470-528 м), MIBM 39340. E-F. Frigidoalvania tanseimaruae Hasegawa, 2014, SoJaBio ст. B6-7 (1001-1011 м). G-J. Punctulum flavum (Okutani, 1964); G-H, "мелководнаЯ форма", SoJaBio ст. A2-10 (455-456 м), MIBM 14270; I-J, "глубоководнаЯ форма", SoJaBio ст. A6-7 (2511-2534 м), MIBM 39334. Все раковины в одном масШтабе, масШтабнаЯ линейка = 1 мм.

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FIG. 3 in A new species of Boreotrophon P. Fischer, 1884 (Gastropoda, Muricidae, Pagodulinae) from the Sea of Japan

FIG. 3. Boreotrophon candelabrum (A–H) Primorye, depth 8–12 m (A–F): A, B – 43.2 mm, C, D – 39.9 mm, E–F – 24.0 mm; Kuril Is., depth 60 m (G–H) – 33.7 mm; B. alborostratus (I–J) Primorye, depth 140 m – 40.0 mm.