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Six new species of the genus Onyx Cobb, 1891 (Nematoda: Desmodoridae) from coastal areas in Vietnam

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Abstract
Six new species of the genus Onyx are described from different coastal zones in Vietnam based on samples collected between 2004 and 2010. Onyx cangionensis sp. n. is characterised by the fact that males have 14-16 equal-sized and equal-distantly arranged sigmoidal precloacal tubular shaped supplements. Onyx blomei sp. n. is characterised by sexual dimorphism in the shape of the amphidial fovea. The male has an atypical amphid with posterior part spiral shaped with 2.5 turns and anterior part hook shaped, whereas the amphidial fovea in the female is simply multispiral with 2.25 turns. Onyx orientalis sp. n. is characterised by its very long cephalic setae and the presence of 18 light-refractive, slightly S-shaped, precloacal tubular supplements in the males. Onyx cobbi sp. n. is also characterised by its sexual dimorphism in the shape of the amphidial fovea: an elongated loop in the male and a multispiral in the female. There are 15 slightly S-shaped, precloacal supplements. The anterior supplement is half the size of the others. Onyx paradimorphus sp. n. is characterised by a multispiral amphidial fovea, spicules regularly bent, strongly cuticularised, 15 S-shaped supplements and 5 papillae with setae within the spicules region. Onyx mangrovi sp. n. is characterised by 17-23 supplements with a complex structure: anterior part is sigmoidal-shaped, posterior part is hook-shaped and by its very short tail with dorsally curved tip.
Keywords
Desmodoridae, Marine nematode, Onyx, mangrove, shallow water, Vietnam.

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Citation

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Chicago
Nguyen, Dinh Tu, Nicole Smol, Ann Vanreusel, and Vu Thanh Nguyen. 2011. “Six New Species of the Genus Onyx Cobb, 1891 (Nematoda: Desmodoridae) from Coastal Areas in Vietnam.” Russian Journal of Nematology 19 (1): 1–20.
APA
Nguyen, Dinh Tu, Smol, N., Vanreusel, A., & Nguyen, V. T. (2011). Six new species of the genus Onyx Cobb, 1891 (Nematoda: Desmodoridae) from coastal areas in Vietnam. RUSSIAN JOURNAL OF NEMATOLOGY, 19(1), 1–20.
Vancouver
1.
Nguyen DT, Smol N, Vanreusel A, Nguyen VT. Six new species of the genus Onyx Cobb, 1891 (Nematoda: Desmodoridae) from coastal areas in Vietnam. RUSSIAN JOURNAL OF NEMATOLOGY. 2011;19(1):1–20.
MLA
Nguyen, Dinh Tu, Nicole Smol, Ann Vanreusel, et al. “Six New Species of the Genus Onyx Cobb, 1891 (Nematoda: Desmodoridae) from Coastal Areas in Vietnam.” RUSSIAN JOURNAL OF NEMATOLOGY 19.1 (2011): 1–20. Print.
@article{2941495,
  abstract     = {Six new species of the genus Onyx are described from different coastal zones in Vietnam based on samples collected between 2004 and 2010. Onyx cangionensis sp. n. is characterised by the fact that males have 14-16 equal-sized and equal-distantly arranged sigmoidal precloacal tubular shaped supplements. Onyx blomei sp. n. is characterised by sexual dimorphism in the shape of the amphidial fovea. The male has an atypical amphid with posterior part spiral shaped with 2.5 turns and anterior part hook shaped, whereas the amphidial fovea in the female is simply multispiral with 2.25 turns. Onyx orientalis sp. n. is characterised by its very long cephalic setae and the presence of 18 light-refractive, slightly S-shaped, precloacal tubular supplements in the males. Onyx cobbi sp. n. is also characterised by its sexual dimorphism in the shape of the amphidial fovea: an elongated loop in the male and a multispiral in the female. There are 15 slightly S-shaped, precloacal supplements. The anterior supplement is half the size of the others. Onyx paradimorphus sp. n. is characterised by a multispiral amphidial fovea, spicules regularly bent, strongly cuticularised, 15 S-shaped supplements and 5 papillae with setae within the spicules region. Onyx mangrovi sp. n. is characterised by 17-23 supplements with a complex structure: anterior part is sigmoidal-shaped, posterior part is hook-shaped and by its very short tail with dorsally curved tip.},
  author       = {Nguyen, Dinh Tu and Smol, Nicole and Vanreusel, Ann and Nguyen, Vu Thanh},
  issn         = {0869-6918},
  journal      = {RUSSIAN JOURNAL OF NEMATOLOGY},
  keyword      = {Desmodoridae,Marine nematode,Onyx,mangrove,shallow water,Vietnam.},
  language     = {eng},
  number       = {1},
  pages        = {1--20},
  title        = {Six new species of the genus Onyx Cobb, 1891 (Nematoda: Desmodoridae) from coastal areas in Vietnam},
  volume       = {19},
  year         = {2011},
}

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