Published December 31, 2017 | Version v1
Taxonomic treatment Open

Cryptonchidae Chitwood 1937

Description

Family Cryptonchidae Chitwood, 1937

77. Cryptonchus abnormis (Allgén, 1933) Schuurmans Stekhoven, 1951 — {37, 66, 70} (0, 0, 8,18; 4) Population structure and abundance. Two juvenile individuals and five females at site 37 (~ 3x10 3/m2) and 1–2 females in the other samples.

Ecology and distribution. Amphibiont. Dwells in terrestrial and aquatic biotopes. Relatively widespread species. Recorded from North and South America, Africa, New Zealand, and in some countries of South and South-East Asia, including Vietnam (Zullini & Peneva 2006; Nguyen 2007; Andrássy 2009b; Ahmad & Jairajpuri 2010).

78. * Cryptonchus exilis (Ditlevsen, 1911) Filipjev, 1934 — {16, 63, 64, 66, 67} (0, 4, 0, 36; 7)

Population structure and abundance. 1 to 4 juveniles and females at each site (up to 1x10 3/m2). Ecology and distribution. Ecology is similar to the species described above. Cosmopolitan. Known from all continents except for Antarctica (Zullini & Peneva 2006). Not previously found in Vietnam.

79. * Cryptonchus Cobb, 1913 sp.— {23} (5, 0, 0, 0; 1)

Population structure and abundance. One gravid female.

Remarks. With its comparatively short tail, this female differs from the two species described above and resembles C. tristis (Cobb, 1893) Cobb, 1913. However, the length of C. tristis females ranges from 1.8–2.4 mm (Gagarin 1993; Ahmad & Jairajpuri 2010) while our specimen is less than 1 mm (968 µm). It differs from yet another species of the genus, C. papillatus Sukul, 1968 having similarly small body size (Sukul 1968), by the lack of mammiform papillae on lips and by some other morphological characters. It is possible that a new representative of the genus was found but analysis of a single individual is insufficient to describe this species.

Notes

Published as part of Gusakov, Vladimir A. & Gagarin, Vladimir G., 2017, An annotated checklist of the main representatives of meiobenthos from inland water bodies of Central and Southern Vietnam. I. Roundworms (Nematoda), pp. 1-43 in Zootaxa 4300 (1) on page 27, DOI: 10.11646/zootaxa.4300.1.1, http://zenodo.org/record/837117

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Linked records

Additional details

Biodiversity

Event date
2010-10-01
Family
Cryptonchidae
Kingdom
Animalia
Order
Enoplida
Phylum
Nematoda
Scientific name authorship
Chitwood
Taxon rank
family
Verbatim event date
2010-10-01
Taxonomic concept label
Cryptonchidae Chitwood, 1937 sec. Gusakov & Gagarin, 2017

References

  • Zullini, A. & Peneva, V. (2006) Order Mononchida. In: Eyualem-Abebe, Traunspurger, W. & Andrassy, I. (Eds.), Freshwater nematodes: ecology and taxonomy. CABI Publishing, Wallingford, pp. 468 - 496.
  • Nguyen, V. T. (2007) Free-living nematodes Monhysterida, Araeolaimida, Chromadorida, Rhabditida, Enoplida, Mononchida, Dorylaimida. In: Dang, N. T. (Ed.), Fauna of Fietnam. Fol. 22. Science and Technics Publishing House, Hanoi, 455 pp. [in Vietnamese]
  • Andrassy, I. (2009 b) Free-living nematodes of Hungary (Nematoda Errantia). III. Pedozoologica Hungarica, No. 5, 1 - 608.
  • Ahmad, W. & Jairajpuri, M. S. (2010) Mononchida: The Predatory Soil Nematodes. Nematology Monographs and Perspectives, 7, 1 - 300.
  • Gagarin, V. G. (1993) Free-living Nematodes from the Fresh Waters of Russia and Adjacent Countries (Order Monhysterida, Areaolaimida, Chromadorida, Enoplida, Mononchida). Gidrometeoizdat, St. Petersburg, 352 pp. [in Russian]
  • Sukul, N. C. (1968) A new species of ironid soil nematode from the Andamans, India, with notes on Oionchus obtusus Cobb. Proceedings of the Zoological Society, 21, 153 - 156.