Abstract
Detailed descriptions of six species of Plectus reported for the first time from India are given on the basis of LM and SEMobservations. Plectus geophilus de Man, 1880, P. aquatilis Andrássy, 1985, P. parvus Bastian, 1865, P. minimus Cobb,1893, P. magadani Kuzmin, 1979 and P. communis Bütschli, 1873 are described and illustrated. The salient morphologicalcharacters of the species are given. The taxonomy of the genus has been discussed along with the status of species pre-senting a great degree of morphometric overlap and continuous variation. An emended diagnosis of the genus is provided with incorporation of relatively consistent and less variable characters.References
Adhikari, B.N., Tomasel, C.M., Li, G., Wall, D.H. & Adams, B.J. (2010) The Antarctic nematode Plectus murrayi: an emerging model to study multiple stress survival. Cold Spring Harbor Protocols, November 1, 2010. Doi: 10.1101/pdb.emo142.
Andrássy, I. (1953) Die Wirkung der verschiedenen Pflanzenarten auf die Zusammensetzung der in der Rhizosphäre lebenden Nematodengemein-schaften. Annales Historico-naturales Musei Nationalis Hungarici, 3, 93–99.
Andrássy, I. (1954) Über einige von Daday beschriebene Nematoden-Arten. Zoologischer Anzeiger, 152, 138–144.
Andrássy, I. (1955) Az erdei talajban élő fonálférgek (Nematoda) mennyiségi és produkciósbiológiai vizsgálata. Kandidátusi értekezés, 1–260.
Andrássy, I. (1958) Erd- und Süsswassernematoden aus Bulgarien. Acta Zoologica Hungarica, 4, 1–88.
Andrássy, I. (1959) Neubenennungen einiger homonymen Nematoden-Gattungen. Nematologica, 4, 223–226.
Andrássy, I. (1967) Ergebnisse der zoologischen Forschungen von Dr. Z. Kaszab in der Mongolei. 92. Weitere Bodennematoden aus den Jahren 1964 und 1965. Opuscula Zoologica Budapest, 6, 203–233.
Andrássy, I. (1972) A Magyarországról eddig kimutatott szabadon élő fonálférgek (Nematoda) jegyzéke. Állattani Közlemenyek, 59, 161–171.
Andrássy, I. (1976) Evolution as a basis for the systematization of nematodes. Budapest, Akadémiai Kiado, 288 pp.
Andrássy, I. (1978) Nematoda. A checklist of the animals inhabiting European inland waters with account of their distribution and ecology. In: Illies, J. (Ed.) Limnofauna Europaea, 98–117.
Andrássy, I. (1984) Klasse Nematoda (Ordnungen Monhysterida, Desmoscolecida, Araeolaimida, Chromadorida, Rhabditida). Stuttgart, Gustav Fischer Verlag, 509 pp.
Andrássy, I. (1985) The genus Plectus Bastian, 1865 and its nearest relatives (Nematoda: Plectidae). Acta Zoologica Hungarica, 31, 1–52.
Andrássy, I. (1990) Szabadon élő fonálférgek (Nematoda) a magyar faunában. Állattani Közlemenyek, 76, 17–38.
Andrássy, I. (1991) The free-living nematode fauna of the Bátorliget Nature Reserve. In: The Bátorliget Nature Reserve - after forty years. Budapest, 129–197.
Andrássy, I. (1992) A short census of free-living nematodes. Fundamental and Applied Nematology, 15, 187–188.
Andrássy, I. (1996) Free-living nematodes in the Bükk Mountains, Hungary. - In: The fauna of the Bükk National Park. Budapest, 33–63.
Andrássy, I. (1997) Nematológiai kutatások a Balatonon. Állattani Közlemenyek, 81, 169–175.
Andrássy, I. (2002) Free-living nematodes from the Fertó-Hanság National Park, Hungary. In: Mahunka, S.(Ed.), The Fauna of the Fertó-Hanság National Park. Budapest, pp21–97.
Andrássy, I. (2005) The free-living nematode fauna of Hungary (Nematoda- Errantia), I. In: Csuzdi, Cs. & Mahunka, S. (Eds.) Pedozoologia Hungarica, 3. Budapest, 518 p.
Bastian, H.C. (1865) Monograph on the Auguillulidae, or free nematodes, marine, land, and freshwater; with descriptions of 100 new species. Transactions of the Linnaean Society of London-Zoology, 25, 73–184.
Bongers, T. & Bongers, M. (1998) Functional diversity of nematodes. Applied Soil Ecology, 10, 239–251.
Borgonie, G., García-Moyano, A., Litthauer, D., Bert, W., Bester, A., van Heerden, E., Möller, C., Erasmus, M. & Onstott, T. C. (2011) "Nematoda from the terrestrial deep subsurface of South Africa". Nature, 474 (7349), 79–82. Doi:10.1038/nature09974.
Bütschli, O. (1873) Beiträge zur Kenntnis der freilebende Nematoden. Nova Acta der Kaiserlichen Leopoldinisch- Carolinischen Deutschen Akademie der Naturforscher, 36, 1–124.
Chitwood, B.G. (1951) North American marine nematodes. Texas Journal of Science, 3, 617–672.
Cobb, N.A. (1893) Nematode worms found attacking sugar cane. Agricultural Gazette of New South Wales, 4, 808–833.
Cobb, N.A. (1918) Estimating the nema population of the soil. U.S. Department of Agriculture.Agricultural Technical Circular of US Department of Agriculture, 1, 48p.
Cobb, N.A. (1920) One hundred new nemas (type species of 100 new genera). Contribution to a Science of Nematology, 9, 217–343.
von Daday, E. (1894) New contributions towards the knowledge of the microfauna of lake Balaton (Nematoda, Rotatoria, Entomostraca). Mathematikai e’s Termeszettudomanyilz Ertesito, 12, 122–145 (in Hungarian).
von Daday, E. (1897) Die freilebenden Sül3wasser-Nemaroden Ungarns. Zoologische Jahrbuecher, 10, 91–134.
De Ley, P. & Blaxter, M. (2002) Systematic position and phylogeny. In: Lee, D.L. (Ed.) The biology of nematodes. London and New York, Taylor & Francis, 1–30.
De Ley, P. & Blaxter, M. (2004) A new system for Nematoda: combining morphological characters with molecular trees, and translating clades into ranks and taxa. Nematology Monographs & Perspectives, 2, 633–653.
De Ley, P. & Coomans, A. (1994) Terrestrial nematodes from the Galápagos Archipelago IV: The genus Plectus Bastian, 1865, with description of three new species (Leptolaimina: Plectidae). Bulletin de l’Institut Royal des Sciences Naturelles de Belgique, Biologie, 64, 43–70.
de Man, J.G. (1880) Die einheimischen, frei in der reinen Erde und im Süssen Wasser lebende Nematoden. Vorläufiger Bericht und descriptivsystematischer Theil. Tijdschrift der Nederlansche Dierkundige Vereeniging, 5, 1–104.
de Man, J.G. (1904) Ein neuer freilebender Rundwurm aus Patagonien Plectus (Plectoides) patagonicus n. Sp. Bericht der Senckenbergischen. Naturforschenden Gesellschaft, 2, 41–45.
Dózsa-Farkas, K. (1965) Untersuchungen über die Fauna des Budapester Leitungswassers, mit besonderer Berücksichtigung der Nematoden. Opuscula Zoologica (Budapest), 5, 173–181.
Ebsary, B.A. (1985) Two new species of Plectus with a redescription of Plectus cancellatus Zullini, 1978 (Nematoda: Plectidae) from Canada. Canadian Journal of Zoology, 63, 2395–2400.
Fürst von Lieven, A. (2003) Functional morphology and evolutionary origin of the three-part pharynx in nematodes.Zoology, 106, 183–201.doi:10.1078/0944-2006-00115
Geraert, E. (1962) De nematodenfauna in en om de wortels van Musa paradisiaca normalis. In: Bijdragen tot de kennis der plantenparasitaire en der vrijlevende Nematoden van Kongo, Instituut voor Dierkunde, Laboratorium voor Systematiek, Rijksuniversiteit, Gent, 5–73.
Hendriksen, N.H. (1983) Anhydrobiosis in nematodes: studies on Plectus sp. In: Lebrun, P., Andre, H. M. & de Medts, A. (Eds.) New Trends in Soil Biology. Universite Catho1ique de Louvain, Louvain-1a-Neuve, Belgium, pp387–394.
Holovachov, O. (2004) Morphology, phylogeny and evolution of the superfamily P1ectoidea Örley, 1880 (Nematoda: P1ectida). Annales Zoologici, 54, 631–672.
Holovachov, O. & De Ley, P. (2006) Order Plectida. In: Eyualem A., Andrássy, I. & Traunspurger, W. (Eds.) Freshwater Nematodes: Ecology and Taxonomy. CAB International, pp609–644.
Kammenga, J.E., van Gestel, C.A.M. & Hornung, E. (2001) Switching life-history sensitivities to stress in soil invertebrates" Ecological Applications, 11, 226–238.
Khan, Z. & Araki, M. (2001) Descriptions of four new and five known species of the genus Plectus Bastian (Nematoda: Plectidae) from Japan. International Journal of Nematology, 11, 177–191.
Klekowski, R.Z., Schiemer, F. & Duncan, A. (1980) A bioenergetic study of a benthic nematode, Plectus palustris de Man, 1880, throughout its life cycle. l The respiratory metabolism at different densities of bacterial food. Oecologia, 44, 119–124.
Kuzmin, L.L. (1979) Opisanie samtha i novogo podvida Plectus acuminatus Bastian, 1865 (Nematoda, Plectidae). Zoologicheskii Zhurnal, 68, 433–435. Moskau.
Lahl, V., Halama, C. & Schierenberg, E. (2003) Comparative and experimental embryogenesis of Plectidae (Nematoda). Developmental Genes and Evolution, 213, 18–27.
Maggenti, A.R. (1961) Revision of the genus Plectus (Nematoda: Plectidae). Proceedings of the Helminthological Society of Washington, 28, 139–166.
Maggenti, A.R. (1963) Comparative morphology in nemic phylogeny. In: Dougherty, E.C. (Ed.). The lower Metazoa, comparative biology and phylogeny. Berkeley, USA. University of California Press, 273–282.
Micoletzky, H. (1916) Ergebnisse einer botanischen Forschungsreise nach Deutsch-Ostafrica und Südafrica (Kapland, Natal und Rhodesien). Süßwasser- Nematoden aus Südafrica. Denkschriften der Kaiserlichen Akademie der Wissenschaften. Mathematisch- naturwissenschaftliche Klasse, 92, 49–171.
Novikova, S.I. & Gagarin, V.G. (1971) New species of the genus Plectus (Nematoda, Plectidae). Zoologicheskii Zhurnal, 50, 1097–1098 (in Russian).
Örley, L. (1880) Az Anguillulidák magánrajza. (Monographie der Anguilluliden). Természetrajzi Füzetek, Budapest, 4, 16–150.
Paramonov, A.A. (1964) Osnovy fitogelmintologii II. [Fundamentals of phytonematology.] (In Russian). Trudy Gelmintologicheskoi Laboratorii, Akademia Nauk SSSR (Moskva), 446 p.
Saverimuttu, J.K.C., Karunanayake, E.H. Chandrasekharan, N.V. & Jayasena, S.M.T. (2000) Molecular characterisation of the actin gene of the filarial parasite Wuchereria bancrofti. International Journal for Parasitology, 30, 119–124
Schiemer, F., Duncan, A. & Klekowski, R.Z. (1980) A bioenergetic study of a benthic nematode, Plectus palustris de Man, 1880, throughout its life cycle. II. Growth, fecundity and energy budgets at different densities of bacterial food and general ecological considerations. Oecologia, 44, 205–212.
Schneider, W. (1937) Freilebende Nematoden der Deutschen Limnologischen Sundaexpedition nach Sumatra, Java und Bali. Archiv für Hydrobiologie, Supplement, 15, 30–108.
Seinhorst, W. (1959) A rapid method for the transfer of nematodes from fixative to anhydrous glycerin. Nematologica, 4, 67–69.
Smythe, A. B. & Nadler, S. A. (2006) Nematode small subunit phylogeny correlates with alignment parameters. Systematic Biology, 55, 972–992.
Soos, A. (1937) Pseudorhabdolaimus limnophilus n.g., n.sp., eine neue, freilebende, Nematode. Zoologischer Anzeiger, 118, 323–325.
Stürzenbaum, S.R., Arts,M.S.J. & Kammenga, J.E. (2005) Molecular cloning and characterization of Cpn60 in the free-living nematode Plectus acuminatus. Cell Stress Chaperones, 10, 79–85.
Tahseen, Q., Ahmad, I. & Jairajpuri, M.S. (1992) Description and developmental biology of Plectus zelli n. sp. (Nematoda: Araeolaimida). Fundamental and Applied Nematology, 15, 503–510.
Timm, R.W. (1971) Antarctic soil and freshwater nematodes from the mcmurdo Sound Region. Proceedings of the Helminthological Society of Washington, 38, 42–52.
Truskova, G.M. (1976). Shest novykh vidov roda Plectus (Nematoda, Plectidae) temnokvojnykh jesov Dalnego Vostoka. Zoologicheskii Zhurnal, 55, 1718–1726; Moskau..
Zell, H. (1993) Die Gattung Plectus Bastian, 1865 sensu lato (Nematoda: Plectidae) - Ein Beitrag zur Ökologie, Biogeographie, Phylogenie und Taxonomie der Plectidae. Andrias, 11, 3–171.
Zullini, A., Loof, P.A.A. & Bongers, T. (2002). Free-living nematodes from nature reserves in Costa Rica. 3. Araeolaimida. Nematology, 4, 709–724.