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Type: Monograph
Published: 2020-06-15
Page range: 1–73
Abstract views: 100
PDF downloaded: 42

Anguillosyllis (Annelida: Syllidae) from multiple deep-water locations in the northern and southern hemispheres

Aquatic Research & Consulting, 24 Hitty Tom Road, Duxbury, Massachusetts 02332 USA.
Annelida ANDEEP Antarctica Atlantic Continental Slope and Rise benthos Borneo Brunei Clarion-Clipperton Fracture Zone deep-sea Georges Bank New England SF-DODS South China Sea


Numerous specimens belonging to the syllid genus Anguillosyllis Day were collected during several deep-sea studies conducted between 1970 and 2011 in depths ranging from 180 to nearly 5000 m. These quantitative studies demonstrated that members of this genus are not as uncommon as once thought but can be among the 10 most common infaunal species at some deep-sea locations. Study areas included Georges Bank (New England), the North, Mid, and South Atlantic Continental Slope and Rise (east coast of North America), the Gulf of Mexico (off Louisiana), off San Francisco, California, the Clarion-Clipperton Fracture Zone (Pacific Ocean), the South China Sea (off Brunei), the abyssal plain in the South Atlantic Ocean, and Antarctica (Scotia Sea, Weddell Sea). Sixteen new species are described, bringing the total number of described Anguillosyllis species to 20; one additional species that cannot be fully characterized is also noted. The new species include eight with palps that are entirely or partially free (Anguillosyllis aciculata n. sp., A. acsara, n. sp., A. carolina n. sp., A. denaria n. sp., A. hadra, n. sp., A. hampsoni n. sp., A. taleola n. sp., and A. truebloodi n. sp.) and eight species with completely fused palps (A. andeepia n. sp., A. blakei n. sp., A. bruneiensis n. sp., A. elegantissima n. sp., A. enneapoda n. sp., A. hessleri n. sp., A. inornata n. sp., and A. sepula n. sp.). Type specimens of A. palpata (Hartman) from off Cape Horn and A. pupa (Hartman) from off New England were examined; A. capensis Day from South Africa and A. lanai Barroso, Paiva, Nogueira & Fukuda from Brazil are discussed. All adult Anguillosyllis have a fixed number of setigers, either 8, 9, 10, or 11, with 11 setigers being the most common. Species differ in the number of setigers, degree of fusion of the palps, degree of development of parapodial lobes, structure and number of internal and external glands, number of setae in anterior setigers, shape and size of proventricle, and annulation of the dorsum. All species for which the anal cirri had not been lost were found to have four, including two long, thin, ventromedial ones and two shorter, usually oval, lateral ones. Reproduction is poorly known in the genus; the present study shows eggs are found in the posterior (post-proventricle) setigers of most species and enter the parapodia from the coelom of several specimens; egg diameters generally ranged from 50–85 µm with A. sepula n. sp. having eggs up to 120 µm, the largest reported for the genus.



  1. Aguado, M.T. & San Martín, G. (2008) Re-description of some enigmatic genera of Syllidae (Phyllodocida: Polychaeta). Journal of the Marine Biological Association of the United Kingdom, 88, 35‒56.

    Aguado, M.T. & San Martín, G. (2009) Phylogeny of Syllidae (Polychaeta) based on morphological data. Zoologica Scripta, 38, 379–402.

    Aguado, M.T., San Martín, G. & Siddall, M.E. (2012) Systematics and evolution of syllids (Annelida, Syllidae). Cladistics, 28, 234‒250.

    Aguado, M.T., Helm, C., Weidhase, M. & Bleidorn, C. (2015) Description of a new syllid species as a model for evolutionary research of reproduction and regeneration in annelids. Organisms Diversity & Evolution, 15, 1–21.

    Aguado M.T., Capa, M., Lago-Barcia, D., Gil, J., Pleijel, F. & Nygren, A. (2019) Species delimitation in Amblyosyllis (Annelida, Syllidae). PLoS ONE, 14 (4), e0214211.

    Barroso, R., Paiva, P.C., Nogueira, J.M.M. & Fukuda, M.V. (2017) Deep sea Syllidae (Annelida, Phyllodocida) from Southwestern Atlantic. Zootaxa, 4221 (4), 401–430.

    Blake, J.A. & Grassle, J.F. (1994) Benthic community structure on the U.S. South Atlantic slope off the Carolinas: Spatial heterogeneity in a current-dominated system. Deep Sea Research Part II, 41 (4–6), 835–874.

    Blake, J.A., Maciolek, N.J., Ota, A.Y. & Williams, I.P. (2009) Long-term benthic infaunal monitoring at a deep-ocean dredged material disposal site off North California. Deep-Sea Research II, 56, 1775–1803.

    Böggemann, M. (2009) Polychaetes (Annelida) of the abyssal SE Atlantic. Organisms Diversity & Evolution, 9, 251–428.

    Böggemann, M. & Purschke, G. (2005) Abyssal benthic Syllidae (Annelida: Polychaeta) from the Angola Basin. Organisms Diversity & Evolution, 5, 221–226.

    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). Zoology, 10, 381–445, 12 figs.

    Day, J.H. (1967) A Monograph on the Polychaeta of Southern Africa. Part I. Errantia. Publication No. 656. British Museum (Natural History), London, 458 pp.

    Fiege, D., Ramey, P. & Ebbe, B. (2010) Diversity and distributional patterns of Polychaeta in the deep South Atlantic. Deep-Sea Research I, 57, 1329–1344.

    Fukuda, M.V. & Barroso R. (2019) First report of brooding of eggs in the deep-sea genus Anguillosyllis (Annelida: Syllidae). Journal of the Marine Biological Association of the United Kingdom, 99 (8), 1775–1778.

    Gunton, L.M., Neal, L., Gooday, A.J., Bett, B.J. & Glover, A.G. (2015) Benthic polychaete diversity patterns and community structure in the Whittard Canyon system and adjacent slope (NE Atlantic). Deep Sea Research Part I: Oceanographic Research Papers, 106, 42–54.

    Haswell, W.A. (1921) The proboscis of the Syllidea. Part 1. Quarterly Journal of Microscopical Science, 65, 323–337.

    Hartman, O. (1965) Deep-water benthic polychaetous annelids off New England to Bermuda and other North Atlantic areas. Allan Hancock Foundation Publications, Occasional Paper No. 28, 1–378 pp., 52 pls. []

    Hartman, O. (1967) Polychaetous annelids collected by the USNS Eltanin and Staten Island cruises, chiefly from Antarctic seas. Allan Hancock Monographs in Marine Biology, 2, 1–387, 51 pls.

    Hartman, O. & Fauchald, K. (1971) Deep-water benthic polychaetous annelids off New England to Bermuda and other North Atlantic Areas. Part II. Allan Hancock Monographs in Marine Biology, 6, 1‒327. []

    Hilbig, B. (1994) Faunistic and zoogeographical characterization of the benthic infauna on the Carolina continental slope. Deep-Sea Research II, 41, 929–950.

    Hilbig, B. & Blake, J.A. (2006) Deep-sea polychaete communities in the northeast Pacific Ocean off the Gulf of the Farallones, California. Bulletin of Marine Science, 78 (2), 243–269. []

    Jeuniaux, C. (1969) Nutrition and digestion. In: Florkin, M. & Scheer, B T. (Eds.), Chemical Zoology (Annelida, Echiura, and Sipuncula. Vol. IV. Academic Press, New York, pp. 69–91.

    Langeneck, J., Musco, L., Busoni, G., Conese, I., Aliani, S. & Castelli, A. (2018) Syllidae (Annelida: Phyllodocida) from the deep Mediterranean Sea, with the description of three new species. Zootaxa, 4369 (2), 197–220.

    Lucas, Y., Sikorski, A. & San Martín, G. (2018) Syllidae (Annelida) from the Boreal and sub-Arctic seas off Norway (North Sea, Norwegian Sea, Barents Sea). Journal of the Marine Biological Association of the United Kingdom, 98 (4), 755–775.

    Maciolek-Blake, N, Grassle, J.F. & Neff, J.M. (Eds.) (1985) Georges Bank Benthic Infauna Monitoring Program. Final Report for Third Year of Sampling. Vol. 2 & 3. U.S. Department of the Interior, Minerals Management Service, Performed under Contract No. 14-12-0001-29192 by Battelle New England Marine Research Laboratory, Duxbury, Massachusetts, 333 pp. & Appendices A–K.

    Trueblood, D.D. & Ozturgut, E. (1997) The Benthic Impact Experiment: A Study of the Ecological Impacts of Deep Seabed Mining on Abyssal Benthic Communities. International Society of Offshore and Polar Engineers. Proceedings of the Seventh International Offshore and Polar Engineering Conference, Honolulu, Hawaii, USA, 25–30 May, 1–7.

    Weidhase, M., Beckers, P., Bleidorn, C. & Aguado, M.T. (2016) On the role of the proventricle region in reproduction and regeneration in Typosyllis antoni (Annelida: Syllidae). BMC Evolutionary Biology, 16 (196), 1–16.

    Wilson, G. (2017) Macrofauna abundance, species diversity and turnover at three sites in the Clipperton-Clarion Fracture Zone. Marine Biodiversity, 47, 323–347.