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Laubieriopsis soyoae sp. nov. Jimi (New Japanese name: Soyo-sube-imomushi-gokai) (Figure 3) Type material. Holotype (NSMT-Pol H-825): 13 mm long, 0.3 mm wide, and 50 paratypes (NSMT-Pol P-826): 10–15 mm long (n=50), 0.3 mm wide (n=50), 24 chaetigers (n=50); free living, sand sediment, off Mikura Island, Tokyo, Japan, by a beam trawl (Fig. 1C, D), at a depth of 1114–1171 m, collected by NJ. One paratypes (ICHUM- 6161): fragmented, used for SEM observation. Description. Holotype (NSMT-Pol H-825) body complete, 13 mm long, 0.3 mm wide, with 24 chaetigers, cylindrical, not swollen in middle region (Fig. 3A, 3B). Living colour transparent (Fig. 3A). Prostomium partially exposed, fused to peristomium (Fig. 3C). Mouth opening ventral, T-shaped. Integument iridescent, smooth, not papillated. Genital papillae unpaired (Fig. 4B), low oval projections, present on right side of posterior margin of chaetiger 8. Anterior segments without annulations. Parapodia biramous, lateral, projected along chaetigers 1–3, inconspicuous in subsequent body region. Interramal papillae, non-pedunculate. All chaetae brownish. Chaetigers 1–3 (Fig. 3D), with chaetae directed anteriorly: notopodia and neuropodia with four curved acicular chaetae per bundle. In chaetiger 4 and following chaetigers (Fig. 3E), chaetae directed laterally or posteriorly: notopodia and neuropodia with short acicular and long capillary chaetae. Acicular chaetae smooth, tips entire, without denticles in tips. Capillary chaetae smooth. Pygidium without anal cirri and papillae (Fig. 3F), withdrawn into posterior segment; chaetae shape same in median chaetigers; anus terminal. Etymology. The species is named after the R/V Soyo -maru. The type specimens from off Mikura Island were collected by the gear present on the ship. The specific name is a noun in the genitive case. Distribution. Only known from the type locality, off Mikura Island, Tokyo, Japan, at a depth of 1114–1171 m. Remarks. Laubieriopsis soyoae sp. nov. can be distinguished from the other members of the genus by the following features: i) 24 chaetigers, ii) chaetigers 1–3 without annulations, and iii) acicular chaetae with tips entire, without denticles. This species most resembles L. arenicola (Riser, 1987) by having acicular chaetae with tapered smooth tips and body with more than 21 chaetigers; however, annulations in chaetigers 1–3 are only present in L. arenicola (Riser 1987; Salazar-Vallejo et al. 2019), and the body has 25 chaetigers. Laubieriopsis hartmanae has been known from Japan (Levenstein 1970; Imajima 2009; Salazar-Vallejo et al. 2019). The new species can be discriminated from L. hartmanae by having 24 chaetigers, instead of only 16, and genital papillae on chaetiger 8, instead of being present between chaetigers 6–7.

Genus Fauveliopsis McIntosh, 1922 (New Japanese name: yadokari-imomushi-gokai-zoku), Published as part of Jimi, Naoto, Fujimoto, Shinta, Ogawa, Akito, Fujita, Yoshihisa, Shigenobu, Yuya & Imura, Satoshi, 2020, Two new species of Fauveliopsidae (Annelida, Sedentaria) from submarine caves and deep sea, Japan, pp. 385-391 in Zootaxa 4878 (2) on page 387, DOI: 10.11646/zootaxa.4878.2.11, http://zenodo.org/record/4424921, {"references":["McIntosh, W. C. (1922) Notes from the Gatty Marine Laboratory, St. Andrews, 44: 1. On new and rare Polychaeta, Gephyrea, etc., from various regions; 2. Recent additions to the British marine Polychaeta (continued). Annals and Magazine of Natural History, Series 9, 9, 1 - 30. https: // doi. org / 10.1080 / 00222932208632638"]}

Fauveliopsis antri sp. nov. Jimi (New Japanese name: doukutsu-yadokari-imomushi-gokai) (Figure 2) Type material. Holotype (NSMT-Pol H-822): 1.2 mm long, 0.2 mm wide; 5 paratypes (NSMT-Pol P-823): 1.0��� 1.2 mm long (n=5), 0.2 mm wide (n=5), 32 chaetigers (n=5); all specimens were extracted from small molluscan shells by using forceps, silt sediment, Daidokutsu cave, off Ie Island, Okinawa, Japan, at a depth of 26 m; collected by NJ and SF. 15 additional paratypes (NSMT-Pol P-824): 1.0��� 1.5 mm long (n=15), 0.2 mm wide (n=15), 32 chaetigers (n=15); obtained from small molluscan shells by washing with fresh water, silt sediment, Shodokutsu cave (���unnamed cave���), at a depth of 18 m (near to Daidokutsu cave). Description. Holotype (NSMT-Pol H-822) body complete, 1.2 mm long, 0.2 mm wide, 32 chaetigers, anterior and median parts cylindrical, posteriorly swollen, divided into three different regions by body colour and chaetal features, borderline of median and posterior regions indistinct. (Fig. 2A). Body colour whitish in anterior and medial parts, posteriorly transparent, without pigmentation, posterior gut yellowish (Fig. 2A). Prostomium partially exposed, fused to peristomium, with a wide, densely ciliated transverse band (Fig. 2B, C). Nuchal organ present on dorsal side of peristomium. Mouth opening ventral, T-shaped opening. Integument opaque, rugose, papillated on dorsal and ventral surface. Body papillae 2���3 ��m in length (Figs. 2F, 4A), digitate, sparsely present on dorsal and ventral sides. Posterior region transparent, rugose; last chaetiger with a transverse band of large, rounded papillae (Fig. 2F). Genital papillae not seen. Parapodia lateral, inconspicuous in all body regions, orange colour in life. Internal papilla pedunculate, on middle of parapodia, along anterior region; smaller and closer to notopodia in median and posterior regions. Chaetigers 1���3 with chaetae directed anteriorly (Fig. 2C): notopodia with straight, thick capillary chaetae (upper) and curved acicular (lower) chaetae; neuropodia with two types: acicular, stout sigmoid acicular (upper) and short sigmoid acicular chaetae. Chaetigers 4 and following with chaetae directed laterally or posteriorly: notopodia and neuropodia with long curved acicular and long capillary chaetae (Fig. 2D). All chaetigers with two notochaetae and two neurochaetae (Fig. 2E). Pygidium without anal cirri; anus terminal with some blunt, globular or digitate papillae surrounding anus (Fig. 2F). Etymology. Latin ��� antrum ��� means ���cave��� in English. The name is derived from the habitat of this new species. The specific name is a noun in the genitive case. Distribution. Only known from submarine caves, off Ie Island, Okinawa, Japan, at a depth of 18��� 26 m. Remarks. Fauveliopsis antri sp. nov. can be distinguished from the other members of the genus by the following features: i) 32 chaetigers, ii) chaetigers 1���3 with stout hooks, iii) minute body (about 1 mm in length), iv) all parapodia with same number of chaetae (2 notochaetae; 2 neurochaetae), and v) presence of dorsal and ventral papillae. The most similar species is F. jameoaquensis N����ez in N����ez, Oca��a & Brito, 1997, also described from caves, by having two chaetae per rami along its minute body. However, the main difference is that F. antri sp. nov., has curved acicular chaetae in chaetigers 1���3, while F. jameoaquensis has straight acicular chaetae (N����ez et al. 1997). The species also resembles F. brevipodus Hartman, 1971 and Fauveliopsis sp. A Wolf, 1984 by having two chaetae per rami along its body, body with more than 15 chaetigers, and papillae on pygidium. The new species differs from F. brevipodus in the chaetiger number and papillae of pygidium: the new species has 32 chaetigers and multi-papillated pygidium, whereas F. brevipodus has 27���29 chaetigers and smooth pygidium. Fauveliopsis sp. A also has multi-papillated pygidium but the new species has minute body (about 3.0 mm long in Fauveliopsis sp. A) with 32 chaetigers (18���30 chaetigers in Fauveliopsis sp. A). Some specimens of Fauveliopsis levensteinae SalazarVallejo, 2019 also have 32 chaetigers but have many chaetae on posterior chaetigers. The new species can be distinguished from two other species recorded from Japan, F. glabra and F. challengeriae (Levenstein 1970; Imajima 2009), by having a minute body and same number of chaetae in all parapodia. Fauveliopsis glabra and F. challengeriae have large bodies (about 5 mm in body length) and the number of chaetae varies depending on the body area., Published as part of Jimi, Naoto, Fujimoto, Shinta, Ogawa, Akito, Fujita, Yoshihisa, Shigenobu, Yuya & Imura, Satoshi, 2020, Two new species of Fauveliopsidae (Annelida, Sedentaria) from submarine caves and deep sea, Japan, pp. 385-391 in Zootaxa 4878 (2) on pages 387-388, DOI: 10.11646/zootaxa.4878.2.11, http://zenodo.org/record/4424921, {"references":["Nunez, J., Ocana, O. & Brito, M. C. (1997) Two new species (Polychaeta: Fauveliopsidae and Nerillidae) and other polychaetes from the marine lagoon cave of Jameos del Agua, Lanzarote (Canary Islands). Bulletin of Marine Science, 60, 252 - 260. [https: // www. ingentaconnect. com / contentone / umrsmas / bullmar / 1997 / 00000060 / 00000002 / art 00007]","Hartman, O. (1971) Abyssal polychaetous annelids from the Mozambique Basin off Southeast Africa, with a compendium of abyssal polychaetous annelids from world-wide areas. Journal of the Fisheries Research Board of Canada, 28, 1407 - 1428. https: // doi. org / 10.1139 / f 71 - 219","Wolf, P. S. (1984) Family Fauveliopsidae Hartman, 1971. In: Uebelacker, J. M. & Johnson, P. G. (Eds.), Taxonomic Guide to the Polychaete of the Northern Gulf of Mexico. 7 Vols. Barry A. Vittor & Associates, Mobile, Alabama, pp. 1 - 37.","Levenstein, R. Y. (1970) Novi i redkie vidi mnogoshchetinkovikh chervei glubokovodnogo roda Fauveliopsis i osobennosti ikh rasprostraneniya. Trudy Instituta Okeanologii, Akademiya Nauk SSSR, 88, 227 - 235.","Imajima, M. (2009) Deep-sea benthic polychaetes off Pacific coast of the northern Honshu, Japan. Monographs, National Museum of Nature and Science, Tokyo, 39, 39 - 192. [https: // www. kahaku. go. jp / research / publication / monograph / download / 39 / p 039 - 192. pdf]"]}

Family Fauveliopsidae Hartman, 1971 (New Japanese name: imomushi-gokai-ka), Published as part of Jimi, Naoto, Fujimoto, Shinta, Ogawa, Akito, Fujita, Yoshihisa, Shigenobu, Yuya & Imura, Satoshi, 2020, Two new species of Fauveliopsidae (Annelida, Sedentaria) from submarine caves and deep sea, Japan, pp. 385-391 in Zootaxa 4878 (2) on page 387, DOI: 10.11646/zootaxa.4878.2.11, http://zenodo.org/record/4424921, {"references":["Hartman, O. (1971) Abyssal polychaetous annelids from the Mozambique Basin off Southeast Africa, with a compendium of abyssal polychaetous annelids from world-wide areas. Journal of the Fisheries Research Board of Canada, 28, 1407 - 1428. https: // doi. org / 10.1139 / f 71 - 219"]}

Genus Laubieriopsis Petersen, 2000 (New Japanese name: sube-imomushi-gokai-zoku), Published as part of Jimi, Naoto, Fujimoto, Shinta, Ogawa, Akito, Fujita, Yoshihisa, Shigenobu, Yuya & Imura, Satoshi, 2020, Two new species of Fauveliopsidae (Annelida, Sedentaria) from submarine caves and deep sea, Japan, pp. 385-391 in Zootaxa 4878 (2) on page 389, DOI: 10.11646/zootaxa.4878.2.11, http://zenodo.org/record/4424921, {"references":["Petersen, M. E. (2000) A new genus of Fauveliopsidae (Annelida Polychaeta), with a review of its species and redescription of some described taxa. Bulletin of Marine Science, 67, 491 - 515. [https: // www. ingentaconnect. com / content / umrsmas / bullmar / 2000 / 00000067 / 00000001 / art 00041? crawler = true]"]}

Enormous quantities of radionuclides were released into the ocean via both atmospheric deposition and direct release as a result of the Fukushima Dai-ichi Nuclear Power Plant (FNPP) accident. This study discusses the southward dispersion of FNPP-derived radioactive cesium (Cs) in subsurface waters. The southernmost point where we found the FNPP-derived 134Cs (1.5–6.8 Bq m–3) was 18°N, 135°E, in September 2012. The potential density at the subsurface peaks of 134Cs (100–500 m) and the increased water column inventories of 137Cs between 0 and 500 m after the winter of 2011–2012 suggested that the main water mass containing FNPP-derived radioactive Cs was the North Pacific Subtropical Mode Water (NPSTMW), formed as a result of winter convection. We estimated the amount of 134Cs in core waters of the western part of the NPSTMW to be 0.99 PBq (decay-corrected on 11 March 2011). This accounts for 9.0% of the 134Cs released from the FNPP, with our estimation revealing that a considerable amount of FNPP-derived r...