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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Dorylaimus

Dorylaimus Dujardin, 1845 (ref. ID; 5942)

Subphylum Penetrantia: Order Dorylaimida: Suborder Dorylaimina: Family Dorylaimidae (ref. ID; 1276)

Order Dorylaimida (ref. ID; 6180)

Family Dorylaimidae (ref. ID; 880, 5942, 6182, 6740)

ref. ID; 1663

Cuticle with longitudinal ridges; more than 2 mm long. Basal portion of esophagus considerably longer than wide. Abundant and common species. (ref. ID; 1663)

ref. ID; 1795

Miscellaneous feeder. (ref. ID; 1795)

ref. ID; 1923

Stylet not greatly attenuated, at most with simple basal extensions (Over 300 species, usually in soil, some species characteristically in fresh water). (ref. ID; 1923)

ref. ID; 5942

Prior to 1959 the genus Dorylaimus Dujardin, 1845 comprised one of the largest and most heterogeneous taxa of free-living nematodes, numbering over 200 valid species. Needed revisions initiated by Andrassy (1959, 1960) split the genus into seven, reducing the number of species of Dorylaimus to 44. Goodey (1963) redefined the genus on the basis of the type. D. stagnalis Dujardin, 1845, and included only those species with longitudinal body ridges and sexes with dissimilar tail shape. He listed 11 species of which 9 remain valid. Andrassy (1969), in the latest revision of the genus, further restricted the genus to species having females with conoid, moderately elongated tails and males with a series of 25 or more contiguous supplements. The number of valid species at the time of this revision had increased to 16. Based on the comprehensive diagnosis of Dorylaimus by Goodey (1963), as amended by Andrassy (1969), we recognize 22 valid species for which a key and tabulated list of diagnostic characters are presented. (ref. ID; 5942)

ref. ID; 6691

Omnivore. (ref. ID; 6691)
  1. Dorylaimus acuticaudata de Man, 1880 (ref. ID; 2588)
  2. Dorylaimus afghanicus Andrassy, 1960 (ref. ID; 5942)
  3. Dorylaimus alaeus Thorne, 1939 (ref. ID; 5942)
  4. Dorylaimus alticola Menzel (ref. ID; 2592 original paper)
  5. Dorylaimus amplexor Nesterov & Liserskaya, 1965 (ref. ID; 5942)
  6. Dorylaimus asymphydorus Andrassy, 1969 (ref. ID; 5942)
  7. Dorylaimus bastiani Butschli, 1873 (ref. ID; 2588)
  8. Dorylaimus brigdammensis de Man, 1876 (ref. ID; 2588)
  9. Dorylaimus carinatus Thorne & Swanger, 1936 (ref. ID; 5942)
  10. Dorylaimus carteri Bastian, 1865 (ref. ID; 2588, 2592, 3439) reported year? (ref. ID; 3598)
  11. Dorylaimus carteri brevicaudatus (ref. ID; 3439)
  12. Dorylaimus carteri longicaudatus (ref. ID; 3439)
  13. Dorylaimus centrocercus de Man, 1907 (ref. ID; 2592)
  14. Dorylaimus crassus de Man, 1884 (ref. ID; 5942)
  15. Dorylaimus doryuris Ditlevsen, 1911 (ref. ID; 2588)
  16. Dorylaimus elongatus de Man, 1876 (ref. ID; 2592)
    Syn; Dorylaimus tennis V. Linstow (ref. ID; 2592)
  17. Dorylaimus eurydorys Ditlevsen, 1911 (ref. ID; 2592, 3439)
  18. Dorylaimus filiformis Bastian, 1865 (ref. ID; 2588, 3439)
  19. Dorylaimus flavomaculatus V. Linstow, 1878 (ref. ID; 880)
  20. Dorylaimus gigans Kleynhans, 1970 (ref. ID; 5942)
  21. Dorylaimus gracilis de Man, 1876 (ref. ID; 2588, 2592)
  22. Dorylaimus helveticus Steiner, 1919 (ref. ID; 5942) reported year? (ref. ID; 1795)
  23. Dorylaimus hofmanneri Menzel, 1914 (ref. ID; 2588, 2592 original paper)
  24. Dorylaimus intermedius de Man, 1884 (ref. ID; 2592)
  25. Dorylaimus intermedius var. alpestris Menzel (ref. ID; 2592 original paper)
  26. Dorylaimus laticollis de Man, 1906 (ref. ID; 2592)
  27. Dorylaimus leuckarti Butschli, 1873 (ref. ID; 2592)
  28. Dorylaimus lineatus Altherr & Deboutteville, 1972 (ref. ID; 5942)
  29. Dorylaimus longicaudatus Butschli, 1874 (ref. ID; 2588)
  30. Dorylaimus longii Cobb, 1888 (ref. ID; 2592)
  31. Dorylaimus macrodorus de Man, 1880 (ref. ID; 3439) or 1884 (ref. ID; 2592)
  32. Dorylaimus macrolaimus de Man, 1884 (ref. ID; 2592)
  33. Dorylaimus macroproctus Altherr, 1963 (ref. ID; 5942)
  34. Dorylaimus meyli Andrassy, 1958 (ref. ID; 5942)
  35. Dorylaimus microdorus de Man, 1880 (ref. ID; 2588)
  36. Dorylaimus monhystera de Man, 1880 (ref. ID; 2588)
  37. Dorylaimus montanus Stefanski, 1924 (ref. ID; 5942)
  38. Dorylaimus multialaeus Khera, 1970 (ref. ID; 5942)
  39. Dorylaimus obtusicaudatus Bastian, 1865 (ref. ID; 2588, 2592, 3439)
  40. Dorylaimus pachys Andrassy, 1970 (ref. ID; 5942)
  41. Dorylaimus paradoxus Eliava, 1967 (ref. ID; 5942)
  42. Dorylaimus polyblastus Bastian (ref. ID; 2592)
  43. Dorylaimus pratensis de Man, 1880 (ref. ID; 2588)
  44. Dorylaimus rhapalocercus de Man, 1876 (ref. ID; 2588)
  45. Dorylaimus ruwenzorii de Coninck, 1935 (ref. ID; 5942)
  46. Dorylaimus similis de Man, 1876 (ref. ID; 2588)
  47. Dorylaimus stagnalis Dujardin, 1845 (ref. ID; 881, 1795, 2592, 5942)
  48. Dorylaimus stenus Andrassy, 1970 (ref. ID; 5942)
  49. Dorylaimus stephani Andrassy, 1969 (ref. ID; 5942)
  50. Dorylaimus stekhoveni Baqri & Coomans, 1973 (ref. ID; 5942)
  51. Dorylaimus sulcatus M.V. Cobb, 1915 (ref. ID; 5942)
  52. Dorylaimus superbus de Man (ref. ID; 2592)
  53. Dorylaimus tennis V. Linstow (ref. ID; 2592)
    See; Dorylaimus elongatus
  54. Dorylaimus tepidus Andrassy, 1959 (ref. ID; 5942)
  55. Dorylaimus thornei Andrassy, 1969 (ref. ID; 5942)
  56. Dorylaimus tritici Bastian, 1865 (ref. ID; 2588, 3439)
  57. Dorylaimus unicus Andrassy, 1970 (ref. ID; 5942)

Dorylaimus amplexor Nesterov & Liserskaya, 1965 (ref. ID; 5942)

Descriptions

Description of this species is inadequate and according to the figures presented belongs to another taxon. We therefore place this species in genus and species inquirenda. (ref. ID; 5942)

Dorylaimus lineatus Altherr & Deboutteville, 1972 (ref. ID; 5942)

Descriptions

Longitudinal body ridges 38-42, very prominent, uniformly spaced by 4-5 µm. Ventromedian vulval papillae well developed, generally two anterior and two posterior to level of vulva. Spermatheca long, 350x80 µm, oval. Sperms spindle shaped, 10-15 µm in length. (ref. ID; 5942)

Remarks

This species differs significantly from D. stagnalis from Canada by the much shorter and narrower stylet, presence of vulval papillae, and size and shape of the spermatheca and sperms. The spicules also are much shorter than those of D. stagnalis. Intercalation of the longitudinal ridges is a prominent feature of D. stagnalis but is absent in D. lineatus. Under low magnifications the ridges of D. lineatus are clearly visible but are obscure in D. stagnalis. Thorne and Swanger (1936) reported D. helveticus from the Lake Nipigon area of Ontario. This species is closely related to D. lineatus. (ref. ID; 5942)

Type deposited

Collection Nos.6806, 6811, 6812. First record for Canada. (ref. ID; 5942)

Measurements

  • Female: L=3.6(3.0-4.3) mm, a=36(30-43), b=4.4(4.0-4.8), c=14(12-15), V=49(47-50). Stylet length 41(40-42) µm, width 2-3 µm. Tail length 250 (200-300) µm. Prerectum length 160-250 µm (n=10). (ref. ID; 5942)
  • Male: L=3.5 (2.9-4.0) mm, a=37(30-42), b=4.3(3.9-4.6), c=74(60-86). Spicule length 83(80-90) µm. Supplements 38-40. Stylet length 38(37-40) µm, width 2-3 µm. Tail length 49(40-60) µm (n=10). (ref. ID; 5942)

    Dorylaimus stagnalis Dujardin, 1845 (ref. ID; 881, 1795, 2592, 5942)

    Descriptions

    Stylet robust, dorsal aperture at least one-third of stylet length. Longitudinal body ridges distinct, 28-32, widely spaced by 9-10 µm. Vulval papillae absent although several obscure innervated organs are present anteriorly and posterior to vulva as shown by Thorne and Swanger (1936). The spermatheca is large, about 130 µm long, containing numerous small, apparently asymmetrical sperms. (ref. ID; 5942)

    Remarks

    Thorne and Swanger (1936) reviewed the descriptions of D. stagnalis and concluded that some were of D. montanus or D. helveticus. Our specimens agree well with those described and figured by Thorne and Swanger (1936) for D. stagnalis. These authors reported this species from the Lake Nipigon area of Ontario, Canada. (ref. ID; 5942)

    Type deposited

    Collection Nos.6532, 6552, 6631, 6638, 6682, 6759, 6799, 6806, 6811, 6812, 6813, 6864. These collections from Canada consisted of several hundred males and females. (ref. ID; 5942)

    Measurements

  • Female: L=5.0(4.2-6.3) mm, a=30(24-34), b=5.1(4.5-5.7), c=16(14-17), V=44(40-47). Stylet length 52(50-55) µm, width 7 µm. Tail length 340(260-400) µm. Prerectum length 280-310 µm (twice anal body width) (n=10). (ref. ID; 5942)
  • Male: L=4.5(3.9-5.5) mm, a=32(32-35), b=5.0(4.7-5.4), c=100(80-110). Spicule length 105(100-110) µm. Stylet length 52(50-55) µm. Tail length 50(40-60) µm. Supplement 38-42 (n=10). (ref. ID; 5942)

    Dorylaimus sulcatus M.V. Cobb, 1915 (ref. ID; 5942)

    Descriptions

    Description of this species was based on one juvenile without illustrations, which we place in species inquirenda. (ref. ID; 5942)