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Issue: Vol. 5468 No. 1: 11 Jun. 2024
Type: Article
Published: 2024-06-11
DOI: 10.11646/zootaxa.5468.1.6
Page range: 154-166
Abstract views: 62
PDF downloaded: 2

Description of two new species of Haliplectus Cobb, 1913 (Nematoda, Plectida, Haliplectidae) from mangrove areas of Sandspit backwater, Karachi, Pakistan

Department of Zoology; University of Karachi; Karachi-75270; Pakistan
Ghent University; Department of Biology; Belgium
National Nematological Research Centre; University of Karachi; Karachi-75270; Pakistan
Department of Zoology; University of Karachi; Karachi-75270; Pakistan
National Nematological Research Centre; University of Karachi; Karachi-75270; Pakistan
Nematoda H. shahinae n. sp. H. sandspitensis n. sp. marine nematodes morphology morphometrics

Abstract

Haliplectus shahinae n. sp. and H. sandspitensis n. sp. two free-living marine nematodes of the family Haliplectidae Chitwood, 1951 collected from mangrove areas of Sandspit backwater, Karachi, Pakistan, are being described and illustrated. Both new species belong to a group of species characterized by the presence of a bipartite basal esophageal bulb with striated or unstriated valve plates. H. shahinae n. sp. is characterized by its comparatively shorter body length (0.4–0.44 mm); annulated cuticle; amphidial fovea at 6–9 µm from the anterior end; bipartite basal bulb with unstriated valve plates; reproductive system mono-prodelphic with reflexed ovary, presence of post uterine sac and vulva at 52–57% of body length and tail short conoid, straight, 1.5–1.8 times anal body width long. H. sandspitensis n. sp. is characterized by more than 1 mm body length (1.0–1.2 mm); annulated cuticle; amphidial fovea at 8–12 µm from the anterior end; bipartite basal bulb with striated valve plates; didelphic reproductive system, with the vulva at 40–47% of body length and tail elongated, conoid, 1.4–2.2 times anal body width long. A dichotomous identification key is provided for the valid species of Haliplectus Cobb, 1913.

 

References

  1. Andrássy, I. (1973) Nematoden aus strand-und hohlenbiotopen von Kuba. Acta Zoologica Academiae Scientiarum Hungaricae, 19 (3‒4), 233‒270.
  2. Blome, D. (1982) Systematik der Nematoda eines Sandstrandes der Nordseeinsel Sylt. Mikrofauna des Meeresbodens, 86, 1‒194.
  3. Chitwood, B.G. (1951) North American marine nematodes. The Texas Journal of Science, 3, 617‒672.
  4. Chitwood, B.G. (1956) A revision of the genus Haliplectus Cobb, 1913. Proceedings of the Helminthological Society of Washington, 23 (1), 78‒87.
  5. Cobb, N.A. (1913) New Nematode genera found inhabiting fresh water and non-brackish soils. Journal of the Washington Academy of Sciences, 3 (16), 432‒444. https://doi.org/10.5962/bhl.part.20323
  6. Cobb, N.A. (1918) Estimating the nema population of soil. United States Department of Agriculture, Agricultural Technical Circular, 1, 1‒47.
  7. Coles, J.W. (1965) Two new species of marine nematodes from the British coast. The Annals and Magazine of Natural History, Series 13, 8 (86), 65‒70. https://doi.org/10.1080/00222936508651540
  8. De Coninck, L.A.P. (1943) Sur quelques espèces nouvelles de nématodes libres des eaux et des terres saumâtres de l’Islande. Biologisch Jaarboek, 10, 193‒220.
  9. Gadea, E. (1973) Sobre la filogenia interna de los Nematodos. Publicación del Instituto de Biologiá Aplicada, 54, 87‒92.
  10. Gerlach, S.A. (1950) Über einige Nematoden aus der Familie der Desmodoriden. Zoologischer Anzeiger, 145, 178‒198.
  11. Gerlach, S.A. (1957) Marine Nematoden aus dem Mangrove-Gebiet von Cananéia (Brasilianische Meeres-Nematoden III). Abhandlungen der Mathemathik-naturwissenschaftlichen Klasse, Akademie der Wissenschaften und Literatur, Mainz, 5, 129‒176.
  12. Gerlach, S.A. (1963) Die Gattung Haliplectus (Chromadorida, Leptolaimidae), zugleich ein Beitrag zur Morphologie und Phylogenie der Nematoden. Zoologischer Anzeiger, 171, 96‒113.
  13. Gerlach, S.A. (1967) Freilebende Meeres-Nematoden von den Sarso-Inseln (Rotes Meer): 3. Beitrag der Arbeitsgruppe Litoralforschung. Meteor Forschungsergebnisse, Reihe D, Biologie, 2, 19‒43.
  14. Gharahkhani, A., Pourjam, E., Leduc, D. & Pedram, M. (2022) The nematode genus Haliplectus Cobb, 1913 (Chromadorea: Haliplectidae): phylogenetic relationships, description of a new species from the Persian Gulf, southern Iran, and a tabular key to valid species. Nematology, 24 (6), 639–655. https://doi.org/10.1163/15685411-bja10153
  15. Heyns, J. & Swart, A. (1993) Studies on Haliplectus Cobb, 1913. New and known species from Seychelles (Nematoda: Haliplectidae). Fundamental and applied Nematology, 16 (3), 199‒209.
  16. Holovachov, O. (2014) Order Plectida Gadea, 1973. In: Schmidt-Rhaesa, A. (Ed.), Handbook of zoology. Gastrotricha, Cycloneuralia, and Gnathifera. Vol. 2. Nematoda. De Gruyter, Berlin, pp. 487‒535. https://doi.org/10.1515/9783110274257.487
  17. Hope, W.D. (1971) The current status of the systematics of marine nematodes. In: Hulings, N.C. (Ed), Proceedings of the first International Conference on Meiofauna. Smithsonian Contribution to Zoology, No. 76, pp. 33‒36.
  18. Hopper, B.E. (1969) Marine nematodes of Canada. II. Marine nematodes from the Minas Basin—Scots Bay area of the Bay of Fundy, Nova Scotia. Canadian Journal of Zoology, 47 (4), 671‒690. https://doi.org/10.1139/z69-114
  19. Nasira, K. & Shahina, F. (2007) Free-living marine nematodes from Arabian Sea: a review. Pakistan Journal of Nematology, 25 (2), 223‒280.
  20. Nasira, K. & Shahina, F. (2012) Marine nematode fauna from mangrove areas of Pakistan. International Journal of Phycology and Phycochemistry, 8 (2), 213‒218.
  21. Nasira, K. & Turpeenniemi, T.A. (2004) Haliplectus dorsalis Cobb in Chitwood, 1956 and Spilophorella candida Gerlach, 1951 (Nematoda: Chromadorida) from Arabian sea of Pakistan. Pakistan Journal of Nematology, 22 (1), 17‒23.
  22. Nasira, K., Shahina, F., Kamran, M. & Ali, R. (2010) Free-living marine nematodes of sandspit backwater mangrove area, Karachi. Pakistan Journal of Nematology, 28 (1), 149‒151.
  23. Nemys eds. (2024) Nemys: World database of nematodes. Haliplectus Cobb, 1913. Available from: https://nemys.ugent.be/aphia.php?p=txdetails&id=2391 (accessed 23 February 2024)
  24. Pastor de Ward, C.T. (1984) Nematodes marinos de la Ria Deseado (Leptolaimina Leptolaimidae, Haliplectidae) Santa Cruz, Argentina. Physis A, 42 (103), 87‒92.
  25. Platt, H.M. & Warwick, R.M. (1980) Significance of free-living nematodes to the littoral ecosystem. In: Price, J.H., Irvine, D.E.G. & Farnham, W.F. (Eds.), The shore environment, Vol. 2. Ecosystem. Academic Press, London, pp. 729‒759.
  26. Saifullah, S.M. (2005) Utilization of mangrove resources in Pakistan. In: Rabbani, M.M., Tabrez, A.R. & Khan, T.M.A. (eds), Utilization of marine resources. Islamic Education, Scientific and Cultural Organization and (Morocco) N.I.O., City Press, Karachi, pp. 147‒157.
  27. Schulz, E. (1934–1935) Die Tierwelt des Küestengrundwassers bei Schilksee (Keiler Bucht), IV: Nematoden aus dem Küstengrundwasser. Schriften des Naturwissenschaftlichen Vereins für Schleswig-Holstein, 20 (2), 435‒467.
  28. Schuurmans Stekhoven, J.H. Jr. (1943) Freilebende marine Nematoden des Mittelmeeres. IV. Freilebende marine Nematoden der Fischereigründe bei Alexandrien. Zoologische Jahrbücher Jena, Systematik, 76 (4), 323‒378.
  29. Seinhorst, J.W. (1959) A rapid method for the transfer of nematodes from fixative to anhydrous glycerin. Nematologica, 4 (1), 67‒69. https://doi.org/10.1163/187529259X00381
  30. Shahina, F., Siddiqi, M.R. & Nasira, K. (2014) Six new species of Haliplectus Cobb, 1913 (Nematoda: Haliplectidae) from mangroves of Karachi, Pakistan. International Journal of Nematology, 24 (1), 68‒80.
  31. Shekhawat, M.S. & Dixit, A.K. (2005) Mangroves can save us from Tsunami. Agrobios Newsletter, 4, 57‒59.
  32. Siddiqi, M.R. (2012) Descriptions of Geohaliplectus andrassyi gen. n., sp. n., Haliplectus bruneiensis sp. n. (Nematoda: Haliplectidae). International Journal of Nematology, 22 (1 & 2), 41‒46.
  33. Swart, A., Heyns, J. & Furstenberg, J.P. (1992) Studies on Haliplectus Cobb, 1913. Description of Haliplectus algoensis n. sp. (Nematoda: Haliplectidae, Suborder Leptolaimina). South African Journal of Zoology, 27 (2), 41‒44. https://doi.org/10.1080/02541858.1992.11448260
  34. Vinciguerra, M.T. & Zullini, A. (1980) New or rare species of nematodes from Italian sand dunes. Animalia, 7 (1/3), 29‒44.
  35. Warwick, R.M., Platt, H.M. & Somerfield, P.J. (1998) Free living marine nematodes. Part III, Monohysterids. In: Barnes, R.S.K. & Crothers, J.H. (Eds.), Synopses of the British Fauna. New Series. No. 53. Field Studies Council, Shrewsbury, pp. 296.
  36. Yeates, G.W. (1967) Studies on nematodes from dune sands. 2. Araeolaimida. New Zealand Journal of Science, 10 (1), 287‒298.
  37. Zhou, R., Chen, Y., Shih, Y. & Guo, Y. (2022) Two new free-living marine nematode species of the genus Haliplectus Cobb, 1913 (Haliplectidae) from mangroves of Shenzhen, Guangdong province, China. Journal of Marine Science and Engineering, 10 (11), 1694. https://doi.org/10.3390/jmse10111694