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Issue: Vol. 5837 No. 3: 24 Jun. 2026
Type: Article
Published: 2026-06-24
DOI: 10.11646/zootaxa.5837.3.5
Page range: 515-530
Abstract views: 73
PDF downloaded: 5

Two new species of pilargid polychaetes (Annelida: Pilargidae) from the southern Gulf of California, Mexico

Instituto Politécnico Nacional; Centro Interdisciplinario de Ciencias Marinas; Departamento de Pesquerías y Biología Marina. Avenida Instituto Politécnico Nacional; Col. Playa Palo de Santa Rita; La Paz; 23096; Baja California Sur; México
Universidad Autónoma de Nuevo León; Facultad de Ciencias Biológicas; Laboratorio de Zoología de Invertebrados No Artrópodos. Av. Pedro de Alba esq. Manuel L. Barragán; San Nicolás de los Garza; 66455; Nuevo León; México
Annelida Cabira Litocorsa Polychaeta La Paz soft bottoms

Abstract

Pilargids are annelid worms inhabiting soft-bottom sediments and are currently represented by 11 genera and approximately 100 described species worldwide. To date, 15 pilargid species have been originally described from Mexican waters. In the present study, two new species, Cabira mexicana sp. nov., and Litocorsa ambigua sp. nov., are described from shallow soft-bottoms of Laguna de La Paz, southern Gulf of California, Mexico, at depths ranging from 1.5 to 6.4 m. Comparative remarks with morphologically similar species are provided. Cabira mexicana sp. nov., is characterized by the presence of a unique set of features related to the first ventral cirri from chaetiger 3, first notopodial hooks from chaetiger 7, neurochaetae capillaries, non-limbate with entire tips, two small, rounded eyespots and pharynx with denticles. Litocorsa ambigua sp. nov., differs from all species mainly by the presence of furcate chaetae. Cabira mexicana sp. nov., and Litocorsa ambigua sp. nov., exhibit a patchy distribution within the lagoon, varying seasonally. Cabira mexicana sp. nov., was associated primarily with muddy to clay-rich sediments, whereas Litocorsa ambigua sp. nov., occurred in mud, clay, and silty sand substrates. Both species were recorded under marine salinities, well-oxygenated waters, and temperatures reflecting the seasonal variability of the lagoon. This study increases the known richness of Pilargidae in Mexican waters and highlights the importance of shallow coastal lagoons of the Gulf of California as reservoirs of little known annelid diversity.

References

  1. Britaev, T.A. & Saphronova, M.A. (1981) New species of the family Pilargidae (Polychaeta) from the Sea of Japan and revision of the genus Cabira. Zoologicheskii zhurnal, 60 (9), 1314–1324.
  2. Cardona-Gutiérrez, M.F., Cruz-Escalona, V.H., Tovar-Hernández, M.A., de León-González, J.A., Borges Souza, J.M. & Peterson, M.S. (2025) Impact of the invasive colonial tunicate Distaplia stylifera on polychaete taxocenosis associated to pen shells in the Gulf of California, Mexico. Bulletin of Marine Science, 101 (4), 1847–1861. https://doi.org/10.5343/bms.2025.0028
  3. Chamberlin, R. (1919) The Annelida Polychaeta [Albatross Expeditions]. Memoirs of the Museum of Comparative Zoology at Harvard College, 48, 1–514.
  4. Chávez-López, S. (2022) Evolución reciente de la barrera El Mogote como indicador ambiental, Baja California Sur, México. Revista Latinoamericana de Recursos Naturales, 18 (1), 6–21.
  5. Cuéllar-Mercado, D.M., Hernández-Alcántara, P. & Solís-Weiss, V. (2019) Composition, richness and taxonomic diversity of polychaete assemblages from La Paz and adjacent oceanic areas of the southern Gulf of California. Regional Studies in Marine Science, 28, 100576. https://doi.org/10.1016/j.rsma.2019.100576
  6. Darbyshire, T. & Mackie, A.S.Y. (2003) Species of Litocorsa (Polychaeta: Pilargidae) from the Indian Ocean and South China Sea. Hydrobiologia, 496, 63–73. https://doi.org/10.1023/A:1026120109644
  7. Day, J.H. (1963) The polychaete fauna of South Africa. Part 8: New species and records from grab samples and dredgings. Bulletin of the British Museum (Natural History), Series Zoology, 10 (7), 381–445. https://doi.org/10.5962/bhl.part.20530
  8. De León-González, J.A., Mayén-Estrada, R., Carrera-Parra, L.F., García-Garza, M.E. & Tovar-Hernández, M.A. (2026) First record of Licnophora chattoni (Ciliophora, Spirotrichea) on the sabellid worm Bispira melanostigma from marina fouling communities. Biodiversity Data Journal, 14, e190347. https://doi.org/10.3897/BDJ.14.e190347
  9. De Saint-Joseph, A.A. de (1899) Note sur une nouvelle famille d’Annélides Polychètes. Bulletin du Muséum d’Histoire Naturelle, Paris, 5, 41–42. https://doi.org/10.5962/p.289656
  10. Gallardo, V.A. (1968) Polychaeta from the Bay of Nha Trang, South Viet Nam. NAGA Report, 4 (3), 35–279.
  11. Glasby, C.J. (2003) A new species of Synelmis (Annelida, Polychaeta, Pilargidae) from New Zealand and designation of a neotype for S. albini from the Canary Islands. Zoosystema, 25 (1), 7–15.
  12. Glasby, C.J. & Salazar-Vallejo, S.I. (2022) Pilargidae Saint-Joseph, 1899. In: Purschke, G., Westheide, W. & Böggemann, M. (Eds.), Handbook of Zoology. Annelida. Pleistoannelida, Errantia II, Phyllodocida. De Gruyter, Berlin, pp. 308–320. https://doi.org/10.1515/9783110647167-011
  13. Harris, L.H., de León-González, J.A. & Salazar-Vallejo, S.I. (2021) Morfología, métodos, clave para familias y clasificación. In: de León-González, J.A., Bastida-Zavala, J.R., Carrera-Parra, L.F., García-Garza, M.E., Salazar-Vallejo, S.I., Solís-Weiss, V. & Tovar-Hernández, M.A. (Eds.), Anélidos marinos de México y América tropical. Universidad Autónoma de Nuevo León, Monterrey, México, pp. 9–39. [In Spanish].
  14. Hartman, O. (1945) The marine annelids of North Carolina. Duke University Marine Station Bulletin, 2, 1–54.
  15. Hernández-Alcántara, P., Tovar-Hernández, M.A. & Solís-Weiss, V. (2008) Polychaetes (Annelida: Polychaeta) described from the Mexican Pacific: an historical review and an updated checklist. Latin American Journal of Aquatic Research, 36 (1), 37–61. https://doi.org/10.3856/vol36-issue1-fulltext-4
  16. Imajima, M. (1987) Pilargidae (Annelida, Polychaeta) from Japan (Part 1). Bulletin of the National Science Museum, Tokyo, Series A (Zoology), 13 (4), 151–164.
  17. Jumars, P.A., Dorgan, K.M. & Lindsay, S.M. (2015) Diet of worms emended: an update of polychaete feeding guilds. Annual Review of Marine Science, 7, 497–520. https://doi.org/10.1146/annurev-marine-010814-020007
  18. Licher, F. & Westheide, W. (1994) The phylogenetic position of the Pilargidae with a cladistic analysis of the taxon—facts and ideas. In: Dauvin, J.-C., Laubier, L. & Reish, D.J. (Eds.), Actes de la 4ème Conférence Internationale des Polychètes. Mémoires du Muséum national d’Histoire naturelle, 162, 223–235.
  19. Mandal, S., Harkantra, S.N. & Salazar-Vallejo, S.I. (2007) Cabira rangarajani n.sp (Polychaeta: Pilargidae) from the Goa coast, central west coast of India. Zootaxa, 1446, 21–29. https://doi.org/10.11646/zootaxa.1446.1.2
  20. Mikac, B., Semprucci, F., Guidi, L., Ponti, M., Abbiati, M., Balsamo, M. & Dovgal, I. (2020) Newly discovered associations between peritrich ciliates (Ciliophora: Peritrichia) and scale polychaetes (Annelida: Polynoidae and Sigalionidae), with a review of polychaete peritrich epibiosis. Zoological Journal of the Linnean Society, 188 (3), 939–953. https://doi.org/10.1093/zoolinnean/zlz111
  21. Pearson, T.H. (1970) Litocorsa stremma, a new genus and species of pilargid (Polychaeta: Annelida) from the west coast of Scotland, with notes on two other pilargid species. Journal of Natural History, 4 (1), 69–77. https://doi.org/10.1080/00222937000770071
  22. Plathong, J., Dean, H.K. & Plathong, S. (2021) Four new species of Pilargidae (Annelida: Pilarginae) from the Gulf of Thailand. Zootaxa, 5071 (4), 537–562. https://doi.org/10.11646/zootaxa.5071.4.4
  23. Rangarajan, K. (1964) A new polychaete of the family Pilargidae from Palk Bay, South India. Journal of Marine Biological Association of India, 6 (1), 122–127.
  24. Read, G. & Fauchald, K. (Eds.) (2026) World Polychaeta Database. Pilargidae Saint-Joseph, 1899. World Register of Marine Species. Available from: https://www.marinespecies.org/aphia.php?p=taxdetails&id=15009 (accessed 20 April 2026)
  25. Rouse, G.W., Pleijel, F. & Tilic, E. (2022) Annelida. Oxford University Press, Oxford, 418 pp.
  26. Salazar Hernández, J.A. (2025) Taxocenosis de poliquetos asociados a fondos blandos en dos temporadas climáticas en la laguna Ensenada de La Paz, Baja California Sur, México. Master’s thesis, Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, La Paz, México, 46 pp. [In Spanish]
  27. Salazar-Vallejo, S.I. (1987 [1986]) Pilargidae (Annelida: Polychaeta) de México: lista de especies, nueva especie y biogeografía. Cahiers de Biologie Marine, 27, 193–209.
  28. Salazar-Vallejo, S.I. (2003) Revision of Synelmis Chamberlin, 1919 (Polychaeta: Pilargidae). Zoosystema, 25 (1), 17–42.
  29. Salazar-Vallejo, S.I. & de León-González, J.A. (2025) Additional new species of marine annelids from Clipperton Island (Nereididae: Pilargidae: Sabellariidae). European Journal of Taxonomy, 1026, 1–29. https://doi.org/10.5852/ejt.2025.1026.3103
  30. Salazar-Vallejo, S.I. & Rizzo, A.E. (2021) Pilargidae de Saint-Joseph, 1899. In: de León-González, J.A., Bastida-Zavala, J.R., Carrera-Parra, L.F., García-Garza, M.E., Salazar-Vallejo, S.I., Solís-Weiss, V. & Tovar-Hernández, M.A. (Eds.), Anélidos marinos de México y América Tropical. Universidad Autónoma de Nuevo León, Monterrey, pp. 645–660.
  31. Uschakov, P.V. & Wu, B.L. (1962) [The Polychaetous annelids of the family Syllidae, Hesionidae, Pilargiidae, Amphinomidae and Eunicidae (Polychaeta, Errantia) from the Yellow Sea]. Studia Marina Sinica, 1 (1), 57–85.
  32. Wang, Q., Li, Y. & Wang, Y.J. E. (2011) Optimizing the weight loss-on-ignition methodology to quantify organic and carbonate carbon of sediments from diverse sources. Environmental Monitoring and Assessment, 174, 241–257. https://doi.org/10.1007/s10661-010-1454-z
  33. Webster, H.E. (1879) The Annelida Chaetopoda of the Virginian coast. Transactions of the Albany Institute, 9, 202–269.
  34. Wolf, P.S. (1986) Three new species of Pilargidae (Annelida: Polychaeta) from the east coast of Florida, Puerto Rico, and the Gulf of Mexico. Proceedings of the Biological Society of Washington, 99 (3), 464–471.

How to Cite

Cardona-Gutiérrez, M.F. & Tovar-Hernández, M.A. (2026) Two new species of pilargid polychaetes (Annelida: Pilargidae) from the southern Gulf of California, Mexico. Zootaxa, 5837 (3), 515–530. https://doi.org/10.11646/zootaxa.5837.3.5