タナイス目

• Kudinopasternakia balanorostrata Kakui et al., 2007

• Pseudosphyrapus quintolongus Kakui et al., 2007

• Nototanoides ohtsukai Kakui & Yamasaki, 2013

• Agathotanais toyoshioae Kakui & Kohtsuka, 2015

端脚目

• Psammogammarus mawatarii Tomikawa et al., 2010

等脚目

• Caecognathia tida Ota et al., 2025

• Gnathia toyoshiomaruae Ota et al., 2025

• Gnathia tajirana Ota et al., 2025

• Gnathia consobrina Monod, 1926　（再記載；Ota et al. 2025）

• Gnathia koreana Song & Ming, 2018　（再記載；Ota et al. 2025）

• Munidion nihonicum Katsuragawa, Shiraki, Shimomura, & Kakui, 2025

ウミグモ綱

• Cheilopallene ohtsukai Takahashi & Kakui, 2025

（関係論文）

1. Kakui K, Kajihara H, Mawatari SF (2007) Two new sphyrapodid species (Crustacea: Tanaidacea: Apseudomorpha) from southwestern Japan. Zootaxa 1563: 37–54.

2. Tomikawa K, Kakui K, Yamasaki H (2010) A new species of Psammogammarus (Amphipoda: Melitidae) from Kuchinoerabu Island, Japan, with a note on its feeding habits. Zoological Science 27: 615–626.

3. Kakui K, Yamasaki H (2013) Nototanaids (Crustacea: Tanaidacea) from Japan, with the description of a new species of Nototanoides. Species Diversity 18: 245–254.

4. Kakui K, Kohtsuka H (2015) Two new shallow-water species of Agathotanais (Crustacea: Tanaidacea) from Japan. Species Diversity 20: 45–58.

5. Ota Y, Kakui K, Shimomura M (2025) Review of the Gnathiidae (Crustacea: Isopoda) of western Japan with a description of five new species, one redescription, and one new Japanese record. Bulletin of Marine Science 101: 941–993

6. Takahashi Y, Kakui K (2025) A new species of the sea spider genus Cheilopallene from Japan (Pycnogonida, Callipallenidae). Spixiana 48: 9–13.

7. Katsuragawa Y, Shiraki S, Shimomura M, Kakui K (2025) A new bopyrid species (Crustacea: Isopoda: Epicaridea: Bopyroidea) parasitic on a squat lobster from Japan, with molecular phylogenies for Epicaridea. Marine Biodiversity 55: 118.

タナイス目

• Kudinopasternakia balanorostrata Kakui et al., 2007　（再記載；Kakui & Kajihara 2011）

• Pseudosphyrapus cuspidiger Kakui & Kajihara, 2011

等脚目

• Stegidotea takedai Shimomura & Kakui, 2012

ウミグモ綱

• Hemichela nanhaiensis Wang et al., 2015　（再記載；Hosoda et al. 2018）

（関係論文）

1. Kakui K, Kajihara H (2011) Pseudosphyrapus cuspidiger sp. nov. from the Nansei Islands, Japan, with a supplementary description of Kudinopasternakia balanorostrata Kakui, Kajihara and Mawatari, 2007 (Crustacea: Tanaidacea: Apseudomorpha: Sphyrapodidae). In: Komai T, Komatsu H (Eds.) New Crustaceans of Japan 2. Bulletin of the National Museum of Nature and Science Supplement 5: 53–70.

2. Shimomura M, Kakui K (2012) A new species of Stegidotea Poore, 1985 (Isopoda: Chaetillidae) from Japan. Crustaceana Monographs 17: 303–314.

3. Hosoda Y, Tomioka S, Kakui K (2018) First record of Hemichela nanhaiensis (Pycnogonida: Ammotheidae) from Japanese waters, with the first description of females. Species Diversity 23: 215–218.

タナイス目

• Chondrochelia sublitoralis Sato et al., 2023

端脚目

• Leipsuropus seisuiae Matsumoto et al., 2023

• Capropodocerus tagamaru Matsumoto et al., 2023

等脚目

• Pseudione nephropsi Shiino, 1951　（再記載；Kakui et al. 2019）

• Deltanthura palpus Shiraki et al., 2022　（再記載；Shiraki et al. 2026）

カイアシ綱

• Rhizorhina ohtsukai Kakui, 2016

毛顎動物門

• Sagittidae sp.（ヤムシ類によるタナイス類の捕食の初報告例．おそらくトロール内で起きた偶発的な捕食と考えられる；Kakui 2020）

（関係論文）

1. Kakui K (2016) Descriptions of two new species of Rhizorhina Hansen, 1892 (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on tanaidacean crustaceans, with a note on their phylogenetic position. Systematic Parasitology 93: 57–68.

2. Kakui K, Shimomura M, Kimura S, Kimura T (2019) Topotype-based DNA barcode of the parasitic isopod Pseudione nephropsi (Bopyridae), with a supplementary morphological description. Species Diversity 24: 103–108.

3. Kakui K (2020) First record of a tanaidacean crustacean fed upon by an arrow worm (Chaetognatha). Bulletin of the Kitakyushu Museum of Natural History and Human History Series A (Natural History) 18: 1–4.

4. Matsumoto Y, Kajihara H, Kakui K (2023a) A new species of Leipsuropus Stebbing, 1899 (Amphipoda: Podoceridae) from Japan. Nauplius 31: e2023005.

5. Matsumoto Y, Kajihara H, Kakui K (2023b) Capropodocerus, a new genus in Podoceridae (Crustacea: Amphipoda) from Japan, with descriptions of two new species. Zootaxa 5336: 577–589.

6. Sato A, Arakawa K, Kakui K (2023) Two new species in Leptocheliidae (Crustacea: Peracarida: Tanaidacea) from Japan, with notes on their phylogenetic position and aspects of morphology. Zoologischer Anzeiger 306: 51–68.

7. Shiraki S, Shimomura M, Kimura T, Kakui K (2026) Additional remarks on Deltanthura palpus (Isopoda: Anthuroidea: Paranthuridae), with an amended diagnosis for Deltanthura and a note on the ontogeny of pereopod 7. Zootaxa 5793: 267–278.

インゴルフィエラ目

• Ingolfiella ogasawarensis Shimomura & Kakui, 2011

等脚目

• Deltanthura palpus Shiraki et al., 2022

• Kupellonura tamago Shiraki et al., 2022

ウミグモ綱

• Pantopipetta lenis Hosoda & Kakui, 2020

（関係論文）

1. Shimomura M, Kakui K (2011) A new species of the genus Ingolfiella Hansen, 1903 (Peracarida, Amphipoda) from Ogasawara Islands, southern Japan. Crustaceana 84: 543–551.

2. Hosoda Y, Kakui K (2020) A new species of Pantopipetta (Pycnogonida: Austrodecidae) from the North Pacific, with a note on the palp articulation. Marine Biology Research 16: 390–395.

3. Shiraki S, Shimomura M, Kakui K (2022a) A new neotenous genus and species, Deltanthura palpus gen. et sp. nov. (Isopoda, Anthuroidea, Paranthuridae) from Japan, with a revised key to the genera in Paranthuridae. Zoosystematics and Evolution 98: 109–115.

4. Shiraki S, Shimomura M, Kakui K (2022b) First report of Hyssuridae (Isopoda: Anthuroidea) from Japan, with the description of a new Kupellonura species. Nauplius 30: e2022023.

扁形動物門

• Fecampiidae sp.（世界で初となるタナイスに寄生するフェカンピア目扁形動物；Kakui et al. 2025）

（関係論文）

1. Kakui K, Shiraki S, Hookabe N (2025) Fecampiid flatworms parasitic in a tanaidacean crustacean. Journal of Helminthology 99: e24.

タナイス目

• Tsuranarthrura shinsei Kakui & Tomioka, 2018

等脚目

• Janirella scutum Ohta et al., 2025

• Janirella spinoscutum Ohta et al., 2025

• Ilyarachna abyssalis Ohta, 2026 in Ohta et al. (2026)

• Ilyarachna hadalis  Ohta, 2026 in Ohta et al. (2026)

• Ilyarachna cf. kussakini Birstein, 1963 sensu Ohta et al. (2026)

（関係論文）

1. Kakui K, Tomioka S (2018) Tsuranarthrura shinsei, a new genus and species in Anarthruridae (Crustacea: Tanaidacea) from the Northwestern Pacific. Species Diversity 23: 61–68.

2. Ohta M, Kakui K, Kojima S, Shimomura M (2025) Integrative taxonomy of Janirella (Isopoda: Asellota: Janirellidae), with descriptions of two new species from the Japan Trench and an amended classification of the genus. Biologia 80: 1407–1423.

3. Ohta M, Kakui K, Kojima S, Shimomura M (2026) Three Ilyarachna species (Isopoda: Asellota: Munnopsidae) showing different bathymetric distributions in Japan and Kuril-Kamchatka Trenches, with descriptions of two new species. Deep Sea Research Part I 230: 104719.

等脚目

• Ilyarachna abyssalis Ohta, 2026 in Ohta et al. (2026)

• Ilyarachna hadalis  Ohta, 2026 in Ohta et al. (2026)

• Ilyarachna cf. kussakini Birstein, 1963 sensu Ohta et al. (2026)

カイアシ綱

• Diexanthema hakuhomaruae Kakui et al., 2023

鞘甲綱

• Mycetomorpha abyssalis Kakui, 2024

ウミグモ綱

• Bathypallenopsis californica (Schimkewitsch, 1893)（再記載；Sekiguchi et al. 2025）

• xxxxx（再記載；Sekiguchi & Kakui 202x）

動吻動物門

• Echinoderes prior González-Casarrubios, Neuhaus, Sánchez, & Yamasaki, 2026 in González-Casarrubios et al. (2026)

• Echinoderes shimadai González-Casarrubios, Neuhaus, Sánchez, & Yamasaki, 2026 in González-Casarrubios et al. (2026)

扁形動物門

• Maricola sp.（世界最深（発表時点）の自活性扁形動物；Kakui & Tsuyuki 2024）

• XXXXX（XXXX；Sekiguchi & Kakui 202x）

内肛動物門

• Loxosomella namacola Kakui, Ono, & Ogawa, 2026

棘皮動物門

• Florometra asperrima (Clark, 1907)（世界で初となるウミグモ体表に固着したシスティディアン期の個体；Sekiguchi et al. 2025）

（関係論文）

1. Kakui K, Fukuchi J, Ohta M (2023) Diexanthema hakuhomaruae sp. nov. (Copepoda: Siphonostomatoida: Nicothoidae) from the hadal zone in the northwestern Pacific, with an 18S molecular phylogeny. Acta Parasitologica 68: 413–419.

2. Kakui K, Tsuyuki A (2024) Flatworm cocoons in the abyss: same plan under pressure. Biology Letters 20: 20230506.

3. Kakui K (2024b) A new parasitic barnacle (Crustacea, Cirripedia, Rhizocephala, Mycetomorpha) from the abyssal zone in the northwestern Pacific. Zoosystematics and Evolution 100: 385–390.

4. Sekiguchi S, Kohtsuka H, Kakui K (2025) First record of the deep-sea sea spider Bathypallenopsis californica (Arthropoda: Pycnogonida) from the northwestern Pacific, with a note on an attached crinoid. Zoological Science 42: 335–341.

5. Kakui K, Ono R, Ogawa A (2026) A new entoproct commensal on holothuroids in the northwestern Pacific abyssal–hadal zone. Deep Sea Research Part I 230: 104716. 

6. Ohta M, Kakui K, Kojima S, Shimomura M (2026) Three Ilyarachna species (Isopoda: Asellota: Munnopsidae) showing different bathymetric distributions in Japan and Kuril-Kamchatka Trenches, with descriptions of two new species. Deep Sea Research Part I 230: 104719.

7. Sekiguchi S, Kakui K (202x)

カイアシ綱

• Dirivultus kaiko Uyeno et al., 2021

• Stygiopontius senckenbergi Ivanenko & Ferrari, 2013　（再記載；Uyeno et al. 2021）

（関係論文）

1. Uyeno D, Kakui K, Watanabe HK, Fujiwara Y (2021) Dirivultidae (Copepoda: Siphonostomatoida) from hydrothermal vent fields in the Okinawa Trough, North Pacific Ocean, with description of one new species. Journal of the Marine Biological Association of the United Kingdom 100: 1283–1298.

端脚目

• Nicippe beringensis Tomikawa et al., 2020

（関係論文）

1. Tomikawa K, Kakui K, Fujiwara Y (2020) A new species of Nicippe from the Bering Sea (Crustacea, Amphipoda, Pardaliscidae), with a redescription of N. tumida. ZooKeys 965: 37–53.

タナイス目

• Atlantapseudes tridens Matsushima, Bâlcu, Kakui, 2025

端脚目

• Capropodocerus kamaitachi Matsumoto et al., 2023

等脚目

• Caecognathia inferoculus Ota et al., 2025

十脚目

• Munidopsis petalorhyncha Baba, 2005　（再記載；Komai et al. 2017）

カイアシ綱

• Rhizorhina soyoae Kakui, 2016

線形動物門

• Micoletzkyia mawatarii Shimada et al., 2012

類線形動物門

• Nectonema sp.（世界で初となる等脚類寄生のハリガネムシ；Kakui et al. 2021）

珍無腸形動物門

• Xenoturbella japonica Nakano et al., 2018

刺胞動物門

• Hemicorallium meraboshi Nonaka et al., 2023

（関係論文）

1. Shimada D, Kakui K, Kajihara H (2012) A new species of deep-sea nematode, Micoletzkyia mawatarii sp. nov. (Nematoda: Enoplida: Phanodermatidae) from northern Japan. Species Diversity 17: 221–226.

2. Kakui K (2016) Descriptions of two new species of Rhizorhina Hansen, 1892 (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on tanaidacean crustaceans, with a note on their phylogenetic position. Systematic Parasitology 93: 57–68.

3. Komai T, Marin I, Kakui K (2017) Rediscovery and redescription of the abyssal squat lobster Munidopsis petalorhyncha Baba, 2005 (Crustacea: Decapoda: Munidopsidae) from the Northwest Pacific. Zootaxa 4226: 93–102.

4. Nakano H, Miyazawa H, Maeno A, Shiroishi T, Kakui K, Koyanagi R, Kanda M, Satoh N, Omori A, Kohtsuka H (2017) A new species of Xenoturbella from the western Pacific Ocean and the evolution of Xenoturbella. BMC Evolutionary Biology 17: 245.

5. Nakano H, Miyazawa H, Maeno A, Shiroishi T, Kakui K, Koyanagi R, Kanda M, Satoh N, Omori A, Kohtsuka H (2018) Correction to: A new species of Xenoturbella from the western Pacific Ocean and the evolution of Xenoturbella. BMC Evolutionary Biology 18: 83.

6. Kakui K, Fukuchi J, Shimada D (2021a) First report of marine horsehair worms (Nematomorpha: Nectonema) parasitic in isopod crustaceans. Parasitology Research 120: 2357–2362.

7. Matsumoto Y, Kajihara H, Kakui K (2023b) Capropodocerus, a new genus in Podoceridae (Crustacea: Amphipoda) from Japan, with descriptions of two new species. Zootaxa 5336: 577–589.

8. Nonaka M, Hanahara N, Kakui K (2023) A new species of Coralliidae (Cnidaria: Octocorallia) collected from eastern Japan. Species Diversity 28: 231–243.

9. Ota Y, Kakui K, Shimomura M (2025) Review of the Gnathiidae (Crustacea: Isopoda) of western Japan with a description of five new species, one redescription, and one new Japanese record. Bulletin of Marine Science 101: 941–993.

10. Matsushima Y, Bâlcu M-J, Kakui K (2025) Atlantapseudes tridens sp. nov. (Tanaidacea: Apseudidae) from the Okinawa Trough, Japan, with a note on the taxonomic status of Atlantapseudes curvatus. Zootaxa 5679: 484–500.

タナイス目

• Agathotanais misakiensis Kakui & Kohtsuka, 2015

• Hamatipeda kohtsukai Kakui & Hiruta, 2021

カイアシ綱

• Rhizorhina hamatipedicola Kakui, 2026

線形動物門

• Deontostoma magnificum (Timm, 1951) Platonova, 1962　（再記載；Shimada & Kakui 2015）

• Phanodermopsis kohtsukai Shimada & Kakui, 2019

• Micoletzkyia nakanoi Shimada & Kakui, 2019

• Crenopharynx caudata (Filipjev, 1927)　（再記載；Shimada & Kakui 2019）

• Wiesoncholaimus jambio Shimada & Kakui, 2021

• Thalassironus cf. britannicus de Man, 1889　（Shimada & Kakui 2021）

• Vasostoma cf. longispicula Huang and Wu, 2010　（Shimada & Kakui 2021）

珍無腸形動物門

• Xenoturbella japonica Nakano et al., 2018

（関係論文）

1. Kakui K, Kohtsuka H (2015) Two new shallow-water species of Agathotanais (Crustacea: Tanaidacea) from Japan. Species Diversity 20: 45–58.

2. Shimada D, Kakui K (2015) First record of the free-living marine nematode Deontostoma magnificum (Timm, 1951) Platonova, 1962 (Nematoda: Leptosomatidae) from Japan. Nematological Research 45: 13–18.

3. Nakano H, Miyazawa H, Maeno A, Shiroishi T, Kakui K, Koyanagi R, Kanda M, Satoh N, Omori A, Kohtsuka H (2017) A new species of Xenoturbella from the western Pacific Ocean and the evolution of Xenoturbella. BMC Evolutionary Biology 17: 245.

4. Nakano H, Miyazawa H, Maeno A, Shiroishi T, Kakui K, Koyanagi R, Kanda M, Satoh N, Omori A, Kohtsuka H (2018) Correction to: A new species of Xenoturbella from the western Pacific Ocean and the evolution of Xenoturbella. BMC Evolutionary Biology 18: 83.

5. Shimada D, Kakui K (2019) Two new and one known species of Phanodermatidae (Nematoda: Enoplida) from Sagami Bay, Japan. Zootaxa 4608: 484–500.

6. Shimada D, Kakui K (2022) Three free-living marine nematodes from Sagami Bay, Japan, with a description of Wiesoncholaimus jambio sp. nov. (Nematoda: Oncholaimidae). Zoological Science 39: 106–114.

7. Kakui K, Hiruta C (2022) Description of a new Hamatipeda species, with an 18S molecular phylogeny (Crustacea: Tanaidacea: Typhlotanaidae). Zoological Science 39: 140–146.

8. Kakui K (2026) Rhizorhina hamatipedicola n. sp. (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on a tanaidacean crustacean, with a note on the effectiveness of COI and 18S data in Rhizorhina taxonomy. Systematic Parasitology 103: 6.

線形動物門

• Proplatycoma tsukubae Shimada & Kakui, 2020

（関係論文）

1. Shimada D, Kakui K (2020) A new species of free-living marine nematode, Proplatycoma tsukubae sp. nov. (Enoplida: Leptosomatidae), from Japan. Species Diversity 25: 205–211.

端脚目

• Opisa takafuminakanoi Narahara-Nakano et al., 2016

内肛動物門

• Barentsia sp.（世界的に報告の少ないウミグモ類の体表から見つかった内肛動物；Kakui & Sekiguchi 2024）

（関係論文）

1. Narahara-Nakano Y, Kakui K, Tomikawa K (2016) Opisa takafuminakanoi, a new species of Opisidae from Hokkaido, Japan (Crustacea: Amphipoda). Zootaxa 4200: 335–339.

2. Kakui K, Sekiguchi S (2024) Colonial entoproct epibiotic on a sea spider. Zoological Science 41: 529–532.

線形動物門

• Mermithidae sp.（世界で初となるタナイスに寄生するMermithidae科センチュウ；Kakui & Shimada 2022）

（関係論文）

1. Kakui K, Shimada D (2022) Dive into the sea: first molecular phylogenetic evidence of host expansion from terrestrial/freshwater to marine organisms in Mermithidae (Nematoda: Mermithida). Journal of Helminthology 96: e33.