Marine Biodiversity

, Volume 43, Issue 4, pp 421–428 | Cite as

One new genus and two new deep-sea nematode species (Desmodoridae, Stilbonematinae) from phosphorite nodule deposits on Chatham Rise, Southwest Pacific Ocean

  • Daniel LeducEmail author
Original Paper


One new genus and two new nematode species of the subfamily Stilbonematinae are described from phosphorite nodule deposits on Chatham Rise, Southwest Pacific Ocean (350 m water depth). Centonema n. gen. is characterised by finely striated cuticle, absence of cephalic capsule, loop-shaped amphid, pharynx differentiated into swollen anterior procorpus, slender median portion, and round posterior bulb, and the male by sub-ventral and sub-dorsal pairs of thick conical setae (porids) on the tail. Centonema n. gen. most closely resembles Eubostrichus, but differs from the latter in the presence of a tripartite pharynx with swollen procorpus, pairs of sub-dorsal porids on the tail of males, and in the size and shape of its bacterial symbionts. The type and only species of the genus, Centonema renamphidum n. gen et n. sp., is characterised by six sub-cephalic setae with one sub-cephalic seta situated directly posterior to each amphid, spicules with capitulum, gubernaculum with broad dorso-caudal apophyses, and tail of males with three pairs of sub-dorsal and four pairs of sub-ventral porids. Eubostrichus hortulanus n. sp. is characterised by cryptospiral amphideal fovea and spiral amphideal aperture, eight short sub-cephalic setae with two sub-cephalic setae situated directly posterior to each amphid, spicules with capitulum, and a gubernaculum with broad dorso-caudal apophyses, the male by one pair of sub-ventral porids in the pre-cloacal region and three pairs of sub-ventral porids on the tail, and sexual dimorphism in the shape of the tail. A key to all valid species of Eubostrichus is provided. Both species were most common in subsurface sediments (3–5 cm depth), and rare in surface sediments (0–1 cm). This is only the second record for this subfamily in a deep-sea environment; the presence of this taxon on Chatham Rise is likely due to the proximity of the highly productive Subtropical Front and the relatively coarse nature of the sediments.


Centonema renamphidum n. gen. et n. sp Eubostrichus hortulanus n. sp Upper continental slope Dichotomous key New Zealand 



Funding was provided by FRST through a postdoctoral fellowship to D. Leduc (UOOX0909), the programme “Coasts & Oceans OBI” (C01X0501), and NIWA by Coasts and Oceans Centre Research Programme 2 (2012/13 SCI). I am grateful to Scott Nodder (NIWA) for facilitating sample collection, Keith Probert (University of Otago) for his support and guidance, and Anna Lawless (University of Waikato) for her help with processing of multicorer samples. I am grateful to two anonymous reviewers for their constructive criticisms on the manuscript. I also acknowledge the other participants of voyages TAN1103, and the officers and crew of R/V “Tangaroa”.


  1. Bradford-Grieve JM, Chang FH, Gall M, Pickmere S, Richards F (1997) Size fractioned phytoplankton standing stocks and primary production during austral winter and spring 1993 in the Subtropical Convergence region near New Zealand. NZ J Mar Freshw Res 31:201–224CrossRefGoogle Scholar
  2. Cullen DJ (1987) The submarine phosphate resource on Central Chatham Rise. Division of Marine and Freshwater Science Reports 2. DSIR, WellingtonGoogle Scholar
  3. Hentschel U, Berger EC, Bright M, Felbeck H, Ott JA (1999) Metabolism of nitrogen and sulfur in ectosymbiotic bacteria of marine nematodes (Nematoda, Stilbonematinae). Mar Ecol Prog Ser 183:149–158CrossRefGoogle Scholar
  4. Leduc D, Pilditch C (2013) Effect of a physical disturbance event on deep-sea nematode community structure and ecosystem function. J Exp Mar Biol Ecol 440:35–41CrossRefGoogle Scholar
  5. Leduc D, Verschelde D (2013) One new genus and two new free-living nematode species (Desmodorida, Desmodoridae) from the continental margin of New Zealand, Southwest Pacific Ocean. Zootaxa 3609:274–290CrossRefGoogle Scholar
  6. Murphy RJ, Pinkerton MH, Richardson KM, Bradford-Grieve JM (2001) Phytoplankton distributions around New Zealand derived from SeaWiFS remote-sensed ocean colour data. NZ J Mar Freshw Res 35:343–362CrossRefGoogle Scholar
  7. Orpin A, Carter L, Goh A, Mackay E, Pallentin A, Verdier A-L, Chiswell S, Sutton P (2008) New Zealand’s diverse seafloor sediments. NIWA Chart, Miscellaneous Series No. 86.Google Scholar
  8. Ott JA, Novak R (1989) Living at an interface: meiofauna at the oxygen/sulfide boundary of marine sediments. In: Ryland JS, Tyler PA (eds) Reproduction, genetics and distribution of marine organisms. 23rd European Marine Biology Symposium. Olsen & Olsen, Fredensborg, pp 415–422Google Scholar
  9. Ott JA, Novak R, Schiemer F, Hentschel U, Nebelsick M, Polz M (1991) Tackling the sulfide gradient: a novel strategy involving marine nematodes and chemoautotrophic ectosymbionts. PSZNI Mar Ecol 12:261–279CrossRefGoogle Scholar
  10. Riemann F, Thiermann F, Bock L (2003) Leptonemella species (Desmodoridae, Stilbonematinae), benthic marine nematodes with ectosymbiotic bacteria, from littoral sand of the North Sea island of Sylt: taxonomy and ecological aspects. Helgol Mar Res 57:118–131CrossRefGoogle Scholar
  11. Somerfield PJ, Warwick RM (1996) Meiofauna in marine pollution monitoring programmes: a laboratory manual. Ministry of Agriculture, Fisheries and Food, LowestoftGoogle Scholar
  12. Tchesunov AV (2013) Marine free-living nematodes of the subfamily Stilbonematinae (Nematoda, Desmodoridae): taxonomic review with descriptions of a few species from the Nha Trang Bay, Central Vietnam. Meiofauna Marina 20:71–94Google Scholar
  13. Tchesunov AV, Ingels J, Popova EV (2012) Marine free-living nematodes associated with symbiotic bacteria in deep-sea canyons of north-east Atlantic Ocean. J Mar Biol Assoc UK 92:1257–1271CrossRefGoogle Scholar
  14. Van Gaever S, Moodley L, de Beer D, Vanreusel A (2006) Meiobenthos at the Arctic HåkonMosby Mud Volcano with a parental caring nematode thriving in sulphide-rich sediments. Mar Ecol Prog Ser 321:143–155Google Scholar

Copyright information

© Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.National Institute of Water and Atmospheric ResearchKilbirnieNew Zealand

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