Abstract
A new species of the genus Acantholaimus is described from the South Atlantic, in the Potiguar Basin off the continental shelf of northeast Brazil. Acantholaimus marliae sp. n. is characterized by the long body; numerous somatic setae arranged in four sublateral longitudinal rows; buccal cavity with five solid teeth (four subventral and one dorsal), with the largest tooth dorsally located and the most protuberant between the subventral teeth shaped similarly to a "bottle opener"; and spiral fovea amphidialis. Acantholaimus marliae sp. n. is the only species described for the genus that has a spiral fovea amphidialis. This is the fifth species of Acantholaimus described from shallow water. An emended diagnosis of the genus is provided.
References
Allgén, C.A. (1933) Freilebende Nematoden aus dem Trondhjemsfjord. Capita Zoologica, 4 (2), 1–162.
Bastian, H.C. (1865) Monograph of the Anguillulidae, or Free Nematoids, Marine, Land, and Freshwater; with Descriptions of 100 New Species. The Transactions of the Linnean Society of London, XXV (Part II), 73–184.
https://doi.org/10.1111/j.1096-3642.1865.tb00179.xBird, A.F. & Bird, J. (1991) The Structure of Nematodes. Academic Press, San Diego, CA, 316 pp.
Chaves, H.A.F., Zembruscki, S.G. & França, A.M.C. (1979) Introdução. In: Chaves, H.A.F. (Ed.), Geomorfologia da Margem Continental Brasileira e das Áreas Oceânicas Adjacentes. Vol. 7. Projeto REMAC, PETROBRAS, Rio de Janeiro, pp. 11–23.
Chitwood, B.G. (1933) A revised classification of the Nematoda. Journal of Parasitology, 20, 1–131.
de Coninck, L.A. (1965) Classe des Nematodes - Systématique des Nématodes et sous classe des Adenophorea. In: Grassé, P. (Ed.), Traité de Zoologie. Vol. 4. Masson, Paris, pp. 586–681.
Coomans, A. (1979) A proposal for a more precise terminology of the body regions of nematode. Annales de la Société Royale Zoologique de Belgique, 108, 155–177.
Costa, F.H.S., Petta, R.A. & Lima, R.F.S. (2006) Medeiros C.N. Determinação da vulnerabilidade ambiental na Bacia Potiguar, região de Macau (RN), utilizando sistemas de informações geográficas. Revista Brasileira de Cartografia, 58 (2), 119–127.
De Grisse, A.T. (1969) Redescription ou modification de quelques techniques utilisées dans l’étude dês nématodes phytoparasitaires. Mededelingen van de Rijksfakulteit Landbouwwetenschappen te Gent, 34, 351–369.
De Ley, P. & Blaxter, M. (2002) Systematic Position and Phylogeny. In: Lee, D.L. (Ed.), The Biology of Nematodes. CRC Press, Taylor & Francis Group, Boca Raton, Florida, pp. 1–30.
https://doi.org/10.1201/b12614-2Decraemer, W. & Smol, N. (2006) Orders Chromadorida, Desmodorida and Desmoscolecida. In: Eyualem-Abebe, E., Traunspurger, W. & Andrássy, I. (Eds.), Freshwater Nematodes: Ecology and Taxonomy. CABI Publishing, Wallingford, pp. 497–573.
Filipjev, I. (1917) Un nématode libre nouveau de la mer Caspienne, Chromadorissa gen. nov. (Chromadoridae, Chromadorini). Zoologicheskii Zhurnal, 2, 24–30.
Filipjev, I.N. (1918) Free-living marine nematodes of the Sevastopol area. Transactions of the Zoological Laboratory and the Sevastopol Biological Station of the Russian Academy of Sciences, Series II (4), 350 pp. [issues I & II, translated from Russian]
Filipjev, I. (1929) Les Nématodes libres de l'extrémité orientale du Golfe de Finlande et de la baie de la Néva. Études de la Neva, 5, 3–22.
Fonseca, G. & Bezerra, T.N. (2014) Order Araeolaimida De Coninck & Schuurmans Stekhoven. 1933. In: Schmidt-Rhaesa, A. (Ed.), Handbook of Zoology: Gastrotricha, Cycloneuralia & Gnathifera. De Gruyter, Berlin, pp. 467–486.
Gerlach, S.A. (1951) Drei bemerkenswerte neue Nematoden aus der Kieler Bucht. Zoologischer Anzeiger, 147, 37–43.
Gerlach, S.A. & Riemann, F. (1973) The Bremerhaven checklist of aquatic nematodes. A Catalogue of Nematoda Adenophorea Excluding the Dorylaimida. Veröffentichungen des Instituts für Meeresforschung in Bremerhaven. Kommissionsverlag Franz Leuwer, Bremen, 404 pp.
Gerlach, S.A., Schrage, M. & Riemann, F. (1979) Die Gattung Acantholaimus (Nematoda, Chromadondae), und Beobachtungen über einen mutmasslichen Transportmechanismus für Spermien bei A. calathus sp. n. Veröffentlichungen des Instituts für Meeresforschung in Bremerhaven, 18, 35–67.
Guilini, K., Bezerra, T.N., Eisendle-Flöckner, U., Deprez, T., Fonseca, G., Holovachov, O., Leduc, D., Miljutin, D., Moens, T., Sharma, J., Smol, N., Tchesunov, A., Mokievsky, V., Vanaverbeke, J., Vanreusel, A., Venekey, V. & Vincx, M. (2016) NeMys: World Database of Free-Living Marine Nematodes. Available from: http://nemys.ugent.be (accessed 22 November 2016)
Hodda, M. (2006) Nematodes in Lotic Systems. In: Eyualem-Abebe, Traunspurger, W. & Andrássy, I. (Eds.), Freshwater Nematodes: Ecology and Taxonomy. CABI Publishing, Wallingford, pp. 163–178.
https://doi.org/10.1079/9780851990095.0163Inglis, W.G. (1983) An outline classification of the Phylum Nematoda. Australian Journal of Zoology, 31, 243–255.
https://doi.org/10.1071/ZO9830243Jensen, P. (1979) Revision of Comesomatidae (Nematoda). Zoologica Scripta, 8, 81–105.
https://doi.org/10.1111/j.1463-6409.1979.tb00621.xJensen, P. (1985) The nematode fauna in the sulphide-rich brine seep and adjacent bottoms of the East Flower Garden, NW Gulf of Mexico. I. Chromadorida. Zoologica Scripta, 14, 247–263.
https://doi.org/10.1111/j.1463-6409.1985.tb00195.xJones, J. (2002) Nematode Sense Organs. In: Lee, D.L. (Ed.), The Biology of Nematodes. CRC Press, Taylor & Francis Group, Boca Raton, Florida, pp. 353–368.
https://doi.org/10.1201/b12614-15Knoppers, B., Ekau, W. & Figueiredo, A.G. (1999) The coast and shelf of east and northeast Brazil and material transport. GeoMarine Letters, 19, 171–178.
https://doi.org/10.1007/s003670050106Kreis, H.A. (1929) Freilebende marine Nemaden von der Nordwest-Küste Frankreichs (Trébeurden Côtes du Nord). Capita Zoologica, II, 7, 1–98
Kreis, H.A. (1963) Marine Nematoda. The Zoology of Iceland, 2, 1–68.
Lambshead, P.J.D., Brown, C.J., Ferrero, T.J., Hawkins, L.E., Smith, C.R. & Mitchell, N.J. (2003) Biodiversity of nematode assemblages from the region of the Clarion Clipperton Fracture Zone, an area of commercial mining interest. BMC Ecology, 3, 1–12.
https://doi.org/10.1186/1472-6785-3-1Larrazábal-Filho, A.L., Silva, M.C. & Esteves, A.M. (2015) Four new species of free living marine nematodes of the family Desmodoridae (Nematoda: Desmodorida) and a redescription of Desmodora nini (Inglis, 1963) from the continental shelf off northeastern Brazil. Zootaxa, 4021 (1), 63–92.
https://doi.org/10.11646/zootaxa.4021.1.3Lorenzen, S. (1994) The phylogenetic systematics of freeliving nematodes. Vol. 162. The Ray Society, London, 383 pp.
de Man, J.G. (1880) Die einheimischen, frei in der reinen Erde und im süßen Wasser lebenden Nematoden. Vorläufiger Bericht und deskriptiv-systematischer Teil. Tijdschrift der Nederlandsche Dierkundige Vereeniging, 5, 1–104.
Miljutina, M.A., Miljutin, D.M., Mahatma, R. & Galéron, J. (2010) Deep-sea nematode assemblages of the Clarion-Clipperton Nodule Province (Tropical North-Eastern Pacific). Marine Biodiversity, 40, 1–15.
https://doi.org/10.1007/s12526-009-0029-0Miljutina, M.A. & Miljutin, D.M. (2012) Seven new and four known species of the genus Acantholaimus (Nematoda: Chromadoridae) from the abyssal manganese nodule field (Clarion-Clipperton Fracture Zone, North-Eastern Tropical Pacific). Helgoland Marine Research, 66, 413–462.
https://doi.org/10.1007/s10152-011-0282-zMiljutina, M.A., Miljutin, D.M. & Tchesunov, A.V. (2013) Seven Acantholaimus (Chromadoridae: Nematoda) species from one deep-sea sediment sample (Angola Basin, south-east Atlantic). Journal of the Marine Biological Association of the United Kingdom, 93, 935–953.
https://doi.org/10.1017/S0025315412000860Miljutin, D.M. & Miljutina, M.A. (2016) Review of Acantholaimus Allgén, 1933 (Nematoda: Chromadoridae), a genus of marine free-living nematodes, with a tabular key to species. Nematology, 18, 537–558.
https://doi.org/10.1163/15685411-00002976Muthumbi, A. & Vincx, M. (1997) Acantholaimus (Chromadoridae: Nematoda) from the Indian Ocean: description of seven species. Hydrobiologia, 346, 59–76.
https://doi.org/10.1023/A:1002937226161Muthumbi, A.W., Vanreusel, A., Duineveld, G., Soetaert, K. & Vincx, M. (2004) Nematode community structure along the continental slope off the Kenyan Coast, Western Indian Ocean. International Review of Hydrobiology, 89, 188–205.
https://doi.org/10.1002/iroh.200310689Muthumbi, W.N.A., Vanreusel, A. & Vincx, M. (2011) Taxon-related diversity patterns from the continental shelf to the slope: a case study on nematodes from the Western Indian Ocean. Marine Ecology, 32, 453–467.
https://doi.org/10.1111/j.1439-0485.2011.00449.xPlatonova, T.A. & Potin, V.V. (1972) On new genera Harpagonchus and Harpagonchoides (Nematoda, Chromadorida, Harpagonchidae fam. n.) living on the parapodia and gills of the Antarctic polychaetes Aglaophatus Kinberg and Hemipodes Quatrefages. Issledovanija Fauny morjei, 11 (8), Resultatibilogitscheskich Issledovanii sovjetskich antarktitcheskich Ekspedizii, 5, 81–85. [in Russian, English summary]
Pearse, A.S. (1942) An Introduction to Parasitology. Charles C. Thomas, Springfield, Illinois, 375 pp.
Ramirez-Llodra, E., Brandt, A., Danovaro, R., De Mol, B., Escobar, E., German, C.R., Levin, L.A., Martinez, A.P., Menot, L., Buhlmortensen, P., Narayanaswamy, B.E., Smith, C.R., Tittensor, D.P., Tyler, P.A., Vanreusel, A. & Vecchione, M. (2010) Deep, diverse and definitely different: unique attributes of the world's largest ecosystem. Biogeosciences, 7, 2851–2899.
https://doi.org/10.5194/bg-7-2851-2010Soetaert, K. & Heip, C. (1995) Nematode assemblages of deep-sea and shelf break sites in the North Atlantic and Mediterranean Sea. Marine Ecology Progress Series, 125, 171–183.
https://doi.org/10.3354/meps125171Somerfield, P.J., Warwick, R.M. & Moens, T. (2005) Meiofauna Techniques. In: Eleftheriou, A. & McIntyre, A. (Eds.), Methods for the Study of Marine Benthos. 3rd Edition. Blackwell Science Ltd, Oxford, pp. 229–272.
https://doi.org/10.1002/9780470995129.ch6Tchesunov, A.V. (2014) Order Chromadorida Chitwood, 1933. In: Schmidt-Rhaesa, A. (Ed.), Handbook of Zoology: Gastrotricha, Cycloneuralia and Gnathifera. Vol. 2. Nematoda. De Gruyter, Berlin, pp. 399–434.
Timm, R.W. (1961) The marine nematodes of the Bay of Bengal. Proceedings of the Pakistan Academy of Sciences, 1 (1), 25–88.
Vanreusel, A., Fonseca, G., Danovaro, R., Da Silva, M.C., Esteves, A.M., Ferrero, T., Gad, G., Galtsova, V., Gambi, C., Da Fonsêca Genevois, V., Ingels, J., Ingole, B., Lampadariou, N., Merckx, B., Miljutin, D., Miljutina, M., Muthumbi, A., Netto, S., Portnova, D., Radziejewska, T., Raes, M., Tchesunov, A., Vanaverbeke, J., Van Gaever, S., Venekey, V., Bezerra, T.N., Flint, H., Copley, J., Pape, E., Zeppilli, D., Arbizu Martinez, P. & Galeron, J. (2010) The contribution of deep-sea habitat heterogeneity to global nematode diversity. Marine Ecology, 31, 6–20.
https://doi.org/10.1111/j.1439-0485.2009.00352.xVitiello, P. (1970) Nématodes libres marins des vases profondes du Golfe du Lion. I. Enoplida. Tethys, 2, 139–210.