Ocean Species Discoveries 13 – 27 — Taxonomic contributions to the diversity of Polychaeta, Mollusca and Crustacea Author (SOSA), Senckenberg Ocean Species Alliance Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Andrade, Luiz F. 0000-0002-4868-737X University of Lodz, Faculty of Biology and Environmental Protection, Department of Invertebrate Zoology and Hydrobiology, 12 / 16 Banacha, Lodz, Poland Author Boyko, Christopher B. 0000-0002-2205-1488 Hofstra University, Department of Biology, Hempstead, NY 11549 - 1140, United States of America Author Brandt, Angelika 0000-0002-5807-1632 Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany & Johann Wolfgang Goethe University Frankfurt, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, Frankfurt am Main, Germany Author Buge, Barbara Muséum national d’Histoire naturelle, Direction des Collections, CP 51, 55 rue de Buffon, Paris, France Author Dávila Jiménez, Yasmín Universidad Nacional Autónoma de México, Facultad de Ciencias, Unidad Multidisciplinaria de Docencia e Investigación Sisal, Sisal, Mexico Author Henseler, Mats Johann Wolfgang Goethe University Frankfurt, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, Frankfurt am Main, Germany & Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Hernández Alcántara, Pablo 0000-0001-5182-5959 Universidad Nacional Autónoma de México, Unidad Académica de Ecología y Biodiversidad Acuática, Instituto de Ciencias del Mar y Limnología, Circuito Exterior S / N, Cd. Universitaria, Mexico City, Mexico Author Jóźwiak, Piotr University of Lodz, Department of Invertebrate Zoology and Hydrobiology, Faculty of Biology and Environmental Protection, 12 / 16 Banacha, Lodz, Poland Author Knauber, Henry 0000-0003-3910-0095 Johann Wolfgang Goethe University Frankfurt, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, Frankfurt am Main, Germany & Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Marcondes Machado, Fabrizio 0000-0002-5085-865X Universidade Estadual de Campinas, Institute of Biology, 13083 - 970, Campinas, São Paulo, Brazil Author Martínez-Muñoz, Carlos A. Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Momtazi, Farzaneh 0000-0002-3074-0865 Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Nakadera, Yumi 0000-0002-6342-4586 Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Qiu, Jian-Wen 0000-0002-1541-9627 Hong Kong Baptist University, Department of Biology, Kowloon, 999077, Hong Kong, China Author Riehl, Torben 0000-0002-7363-4421 Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany & Johann Wolfgang Goethe University Frankfurt, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, Frankfurt am Main, Germany Author Rouse, Greg W. 0000-0001-9036-9263 University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States of America Author Sigwart, Julia D. 0000-0002-3005-6246 Johann Wolfgang Goethe University Frankfurt, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, Frankfurt am Main, Germany & Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Sirenko, Boris Zoological Institute of the Russian Academy of Sciences, Universitetskaya Emb, 1, St Petersburg, Russia Author Souza-Filho, Jesser F. 0000-0001-5248-2134 Universidade Federal de Pernambuco, Museu de Oceanografia Prof. Petrônio Alves Coelho, Laboratório de Carcinologia, Av. Arquitetura s / n, Cidade Universitária, Recife, Brazil Author Steger, Jan 0000-0001-7021-810X Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany & University of Vienna, Department of Palaeontology, Josef-Holaubek-Platz 2, Vienna, Austria Author Stępień, Anna University of Lodz, Faculty of Biology and Environmental Protection, Department of Invertebrate Zoology and Hydrobiology, 12 / 16 Banacha, Łódź, Poland Author Tilic, Ekin 0000-0003-0463-322X Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Trautwein, Bianca Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Vončina, Katarzyna Johann Wolfgang Goethe University Frankfurt, Department of Biological Sciences, Institute of Ecology, Evolution and Diversity, Max-von-Laue-Str. 13, Frankfurt am Main, Germany & Senckenberg Research Institute and Natural History Museum Frankfurt, Department of Marine Zoology, Frankfurt am Main, Germany Author Williams, Jason D. 0000-0001-5550-9988 Hofstra University, Department of Biology, Hempstead, NY 11549 - 1140, United States of America Author Zhang, Junlong 0000-0003-3831-4673 Chinese Academy of Sciences, Institute of Oceanology, Qingdao, China text Biodiversity Data Journal 2025 2025-10-15 13 e 160349 e 160349 journal article 10.3897/BDJ.13.e160349 D20787E7-2F4D-4FFD-9F2D-93C8DD8AC6AD

Table 2. Morphological characters of Spinther spp. Modified after Yamamoto & Imajima, 1985 and species accepted on WoRMS.

Species	Author	Type Locality	Ventrum	Parapodial extension	Neurochaetae	Notochaetae	Number of segments	Length in mm	References
Spinther alaskensis	Hartman, 1948	Aleutians, Alaska	papillate	present	falcate smooth	entire, except for very few, very slender bifid ones, golden and entire, about two times as long as skin folds	46–47	ca. 28	Hartman (1948); Uschakov (1950)
Spinther arcticus	(M. Sars, 1851)	Northern Norway	smooth	absent	falcate smooth	bifid only, distal part spread	12–24	1–9	Graff (1888)
Spinther australiensis	Augener, 1913	Western Australia	smooth	absent	falcate lateral tooth	bifid only	15–31	4.5–7.5	Hartman (1948)
Spinther bohnorum	Tilic & Rouse, sp. nov.	French Polynesia	smooth	absent	falcate lateral tooth	entire and bifid, distal part spread	7–13	0.5–1.5	this study
Spinther citrinus	(Stimpson, 1853)	Eastern Canada	papillate	present	falcate smooth	largely entire, a few bifid, both equally thick	30–48	11–26	Hartman (1948)
Spinther ericinus	Yamamoto & Imajima, 1985	Japan	smooth and segmentally ridged	present	falcate smooth	bifid only, distal part spread	27	10.1	Yamamoto and Imajima (1985)
Spinther hystrix	Uschakov, 1950	Eastern Russia	papillate	present	falcate smooth	entire, except for very few, very slender bifid ones, golden and entire, about five times as long as skin folds	up to 50	max. 50	Uschakov (1950)
Spinther japonicus	Imajima & Hartman, 1964	Japan	smooth	absent	falcate smooth	bifid and entire, the ratio is between 1: 2 and 1: 3	29	5	Imajima and Hartman (1964)
Spinther oniscoides	Johnston, 1845	Ireland	papillate	present	falcate smooth	bifid only	20–25	4–13	Hartman (1948)
Spinther sagamiensis	Imajima, 2003	Japan	papillate	present	falcate smooth	bifid only	14	2.7	Imajima (2003)
Spinther usarpia	Hartman, 1967	Antarctic Peninsula	smooth	absent	falcate smooth	bifid only, distal part not spread	20	3	Hartman (1967)
Spinther vegae	Augener, 1928	Bering Strait	papillate	present	falcate smooth	bifid and entire, both equal in number and equally thick	43–52	20–25	Hartman (1948)