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 1. Morphological comparison of nereidid species belonging to the genus Nicon Kinberg, 1865.

Species	Longest tentacular cirri reaching to …	Dorsal cirrus	Notopodial dorsal ligules	Notopodial prechaetal lobes	Notopodial median ligule	Neuropodial spinigers	Neuropodial falcigers
N. ablepsia Wang, Cheng & Wang, 2021	chaetiger 6	long, inserted in middle of ligule	sub-conical	absent	sub-conical	homogomph	heterogomph
N. abyssalis Hartman, 1967	chaetiger 2	shorter dorsal ligule, inserted at base of ligule	reduced, cirriform	absent	elongate in posterior chaetigers	heterogomph; homogomph?	homogomph?; heterogomph?
N. aestuariensis Knox, 1951	chaetiger 5 (4–6)	shorter dorsal ligules, inserted at base of ligule	conical	shorter	conical	homogomph; heterogomph	heterogomph
N. japonicus Imajima, 1972	chaetiger 2	longer than ligule, inserted at base of ligule; posteriorly much longer	triangular	subulate, shorter than median ligule; absent posteriorly	triangular	homogomph; heterogomph	heterogomph; pseudo-compund with bifid tips in median parapodia; a simple chaeta in posterior parapodia
N. maculatus Kinberg, 1865	chaetiger 5–9	extending beyond dorsal ligules	blunty conical	absent	blunty conical	homogomph	heterogomph
N. moniloceras (Hartman, 1940)	chaetiger 7–9 (moniliform)	slender, longer than dorsal ligule; small posteriorly	digitiform, triangular posteriorly	absent	digitiform, triangular posteriorly	homogomph; heterogomph	heterogomph
N. orensanzi de León-González & Trovant, 2013	chaetiger 2	short, inserted at base of ligule	longer, cirrus-like on median and posterior chaetigers	small anteriorly; absent in median and posteriorly	subulate	Homogomph; heterogomph	sesquigomph
N. pettiboneae de León-González & Salazar-Vallejo, 2003	chaetiger 5	longer than ligule, inserted medially on ligule	triangular	absent	triangular	homogomph	heterogomph; sesquigomph
N. rotundus Hutchings & Reid, 1990	chaetiger 2	extending beyond dorsal ligules	subtriangular along body	shorter	conical, triangular posteriorly	homogomph	homogomph; heterogomph
N. yaquinae Fauchald, 1977	chaetiger 4 (posterior dorsal cirri lost)	slender, longer than dorsal ligule; attached medially on ligule	subtriangular	absent	triangular	Homogomph; heterogomph	heterogomph
Nicon salinus Hernández-Alcántara & Dávila-Jiménez sp. nov.	chaetiger 2	short, inserted in base of ligule	longer, cirrus-like on median and posterior chaetigers	subulate, similar in length to median ligule; short in median; absent posteriorly	triangular	homogomph	homogomph