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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Tobrilus

Tobrilus Andrassy, 1959 (ref. ID; 3570)

Subphylum Penetrantia: Order Enoplida: Suborder Trypilina: Family Tobrilidae (ref. ID; 1276)

Enoplida Filijev, 1929: Family Tripylidae De Man, 1876: Subfamily Tobrilinae De Coninck, 1965 (Filipjev, 1918) (ref. ID; 3570)

Order Enoplida: Family Tobrilidae (ref. ID; 6862, 7912)

Family Tobrilidae (ref. ID; 5972, 6740)

Family Tripylidae (ref. ID; 880, 6182)

ref. ID; 1663

Stoma funnel-shaped; amphid stirrup-shaped. (ref. ID; 1663)

ref. ID; 1795

Miscellaneous feeder. (ref. ID; 1795)

ref. ID; 3570

Type species

Tobrilus gracilis (Bastian, 1865) (ref. ID; 3570)
  1. Tobrilus aberrans (Filipjev, 1928) (ref. ID; 3570)
    Syn; Trilobus aberrans Filipjev, 1928 (ref. ID; 3570)
  2. Tobrilus aberrans (W. Schneider, 1925) Andrassy, 1959 (ref. ID; 5972)
  3. Tobrilus aequiseta (W. Schneider, 1939) (ref. ID; 3570)
    Syn; Trilobus aequiseta W. Schneider, 1939 (ref. ID; 3570)
  4. Tobrilus allophysis (Steiner, 1919) (ref. ID; 3570)
    Syn; Trilobus gracilis subsp. allophysis Steiner, 1919 (ref. ID; 3570)
  5. Tobrilus allophysoides (Micoletzky, 1925)
    See; Tobrilus helveticus (ref. ID; 3570)
  6. Tobrilus allophysoides (Altherr, 1953)
    See; Tobrilus altherri (ref. ID; 3570)
  7. Tobrilus altherri Andrassy, 1959 (ref. ID; 3570)
  8. Tobrilus andrassyi Altherr, 1963 (ref. ID; 3570)
  9. Tobrilus anguiculus Tsalolichin, 1977 (ref. ID; 7909)
  10. Tobrilus armatus (Allgen, 1925) (ref. ID; 3570)
    Syn; Trilobus armatus Allgen, 1925 (ref. ID; 3570)
  11. Tobrilus bayonensis Altherr, 1963 (ref. ID; 3570)
  12. Tobrilus biroi (Daday, 1899) (ref. ID; 3570)
    Syn; Trilobus biroi Daday, 1899 (ref. ID; 3570)
  13. Tobrilus breviductus Loof & Riemann, 1976 (ref. ID; 5972)
  14. Tobrilus brevisetosus (Filipjev, 1929) (ref. ID; 3570)
    Syn; Trilobus brevisetosus Filipjev, 1929 (ref. ID; 3570)
  15. Tobrilus brzeskii Altherr, 1963 (ref. ID; 3570)
  16. Tobrilus closlongicaudatus Gagarin, 1971 (ref. ID; 3570)
  17. Tobrilus cosimiloides Altherr, 1965 (ref. ID; 3570)
  18. Tobrilus delamarei Altherr, 1963 (ref. ID; 3570)
  19. Tobrilus diversipapillatus (Daday, 1905)
    See; Tobrilus longus (ref. ID; 3570)
  20. Tobrilus dryophilus (Rahm, 1924) (ref. ID; 3570)
    Syn; Trilobus dryophilus Rahm, 1924 (ref. ID; 3570)
  21. Tobrilus elephas Andrassy, 1964 (ref. ID; 3570)
  22. Tobrilus filipjevi Ebsary, 1982 (ref. ID; 5972 original paper)
    Syn; Tobrilus longus sensu Filipjev, 1929 nec Tobrilus longus (Leidy, 1851) (ref. ID; 5972)
  23. Tobrilus findeneggi Schiemer, 1971 (ref. ID; 3570)
  24. Tobrilus flagellatus Andrassy, 1963 (ref. ID; 3570)
  25. Tobrilus fortis Tsalolikhin, 1972 (ref. ID; 3570)
  26. Tobrilus gracilis (Bastian, 1865) (ref. ID; 3570) or (Bastian, 1865) Andrassy, 1959 (ref. ID; 880)
    Syn; Trilobus gracilis Bastian, 1865 (ref. ID; 3570)
  27. Tobrilus graciloides (Daday, 1908) (ref. ID; 3570)
    Syn; Trilobus graciloides Daday, 1908 (ref. ID; 3570); Trilobus malayanus W. Schneider, 1937 (ref. ID; 3570)
  28. Tobrilus grandipapillatus (Brakenhoff, 1914) (ref. ID; 3570)
    Syn; Trilobus grandipapillatus Brakenhoff, 1914 (ref. ID; 3570)
  29. Tobrilus grandipapilloides (Micoletzky, 1922)
    See; Paratrilobus grandipapilloides (ref. ID; 3570)
  30. Tobrilus helveticus (Hofmanner in Hofmanner & Menzel, 1914) (ref. ID; 3570)
    Syn; Trilobus allophysoides Micoletzky, 1925 (ref. ID; 3570); Trilobus helveticus Hofmanner in Hofmanner & Menzel, 1914 (ref. ID; 3570)
  31. Tobrilus hoehnelensis (Allgen, 1952) (ref. ID; 3570)
    Syn; Trilobus hoehnelensis Allgen, 1952 (ref. ID; 3570)
  32. Tobrilus homophysalidis (subsp.) (Steiner, 1919)
    See; Tobrilus medius (ref. ID; 3570)
  33. Tobrilus hopei Loof & Riemann, 1976 (ref. ID; 5972)
  34. Tobrilus husmanni (Altherr, 1958)
    See; Trilobus husmanni Altherr, 1958 (ref. ID; 3570)
  35. Tobrilus imberbis (Andrassy, 1953)
    See; Tobrilus imberbis (ref. ID; 3570)
  36. Tobrilus incognitus Tsalolikhin, 1972 (ref. ID; 3570)
  37. Tobrilus intermedius (subsp.) (W. Schneider, 1923)
    See; Tobrilus gracilis subsp. intermedius (ref. ID; 3570)
  38. Tobrilus kirjanovae (Karimova, 1957) (ref. ID; 3570)
    Syn; Trilobus kirjanovae Karimova, 1957 (ref. ID; 3570)
  39. Tobrilus lemani (subsp.) Juget, 1969
    See; Tobrilus pellucidus subsp. lemani (ref. ID; 3570)
  40. Tobrilus leptosoma (De Man, 1880)
    See; Tobrilus pellucidus (ref. ID; 3570)
  41. Tobrilus lomnickii (Grochmalicki, 1911) (ref. ID; 3570)
    Syn; Trilobus lomnickii Grochmalicki, 1911 (ref. ID; 3570)
  42. Tobrilus longicauda (Linstow, 1876) (ref. ID; 3570)
    Syn; Trilobus longicauda Linstow, 1876 (ref. ID; 3570)
  43. Tobrilus longicaudatus (Schneider, 1923) Andrassy, 1959 (ref. ID; 5972)
  44. Tobrilus longicaudatus (Stefanski, 1938) (ref. ID; 3570)
    Syn; Trilobus longicaudatus Stefanski, 1938 (ref. ID; 3570)
  45. Tobrilus longior Altherr, 1963 (ref. ID; 3570)
  46. Tobrilus longus (Leidy, 1851) Andrassy, 1959 (ref. ID; 5972)
  47. Tobrilus longus (Leidy, 1851) Bastian, 1865 (ref. ID; 3570)
    Syn; Anguillula long Leidy, 1851 (ref. ID; 3570); Trilobus diversipapillatus Daday, 1905 (ref. ID; 3570)
  48. Tobrilus macrospiculum Altherr, 1963 (ref. ID; 3570)
  49. Tobrilus malayanus (W. Schneider, 1937)
    See; Tobrilus graciloides (ref. ID; 3570)
  50. Tobrilus medius (G. Schneider, 1916) (ref. ID; 3570)
    Syn; Trilobus gracilis subsp. homophysalidis Steiner, 1919 (ref. ID; 3570); Trilobus medius G. Schneider, 1916 (ref. ID; 3570)
  51. Tobrilus murisieri (Altherr, 1963) (ref. ID; 3570)
    Syn; Trilobus murisieri Altherr, 1963 (ref. ID; 3570)
  52. Tobrilus octiespapillatus (Linstow, 1876) (ref. ID; 3570)
    Syn; Trilobus octiespapillatus Linstow, 1876 (ref. ID; 3570)
  53. Tobrilus ornatus Altherr, 1963 (ref. ID; 3570)
  54. Tobrilus paludicola (Micoletzky, 1925)
    See; Tobrilus stefanskii (ref. ID; 3570)
  55. Tobrilus papillicaudatus Altherr, 1963 (ref. ID; 3570)
  56. Tobriluss parapellucidus Ebsary, 1982 (ref. ID; 5972 original paper)
  57. Tobrilus parvipapillatus (Kreis, 1932) (ref. ID; 3570)
    Syn; Trilobus parvipapillatus Kreis, 1932 (ref. ID; 3570)
  58. Tobrilus parvus Gagarin, 1991 (ref. ID; 7912 original paper)
  59. Tobrilus pellucidus (Bastian, 1865) (ref. ID; 3570) or (Bastian, 1865) Andrassy, 1959 (ref. ID; 5972)
    Syn; Trilobus pellucidus Bastian, 1865 (ref. ID; 3570); Trilobus leptosoma De Man, 1880 (ref. ID; 3570); Trilobus tenuicaudatus Daday, 1894 (ref. ID; 3570)
  60. Tobrilus pellucidus subsp. lemani Juget, 1969 (ref. ID; 3570)
  61. Tobrilus profundus (subsp.) Micoletzky, 1914
    See; Tobrilus gracilis subsp. profundus (ref. ID; 3570)
  62. Tobrilus pseudallophysis (Micoletzky, 1925)
    See; Tobrilus zakopanensis (ref. ID; 3570)
  63. Tobrilus punctatus (Stefanski, 1916) (ref. ID; 3570)
    Syn; Trilobus gracilis subsp. punctatus Stefanski, 1916 (ref. ID; 3570)
  64. Tobrilus sablensis Ebsary, 1982 (ref. ID; 5972 original paper)
  65. Tobrilus savaryi Altherr, 1963 (ref. ID; 3570)
  66. Tobrilus scallensis (W. Schneider, 1925) (ref. ID; 3570)
    Syn; Trilobus gracilis subsp. scallensis W. Schneider, 1925 (ref. ID; 3570)
  67. Tobrilus setosus Altherr, 1963 (ref. ID; 3570)
  68. Tobrilus stefanskii (Micoletzky, 1925) (ref. ID; 3570), cf. stefanskii (Mikoletzky, 1925) Andrassy, 1959 (ref. ID; 880)
    Syn; Trilobus gracilis subsp. consimilis Schneider, 1939 (ref. ID; 3570); Trilobus stefanskii Micoletzky, 1925 (ref. ID; 3570); Trilobus stefanskii subsp. paludicola Micoletzky, 1925 (ref. ID; 3570)
  69. Tobrilus stefanskii subsp. stenurus (Filipjev, 1929) (ref. ID; 3570)
    Syn; Trilobus stefanskii subsp. stenurus Filipjev, 1929 (ref. ID; 3570)
  70. Tobrilus steineri (Micoletzky, 1925) (ref. ID; 3570)
    Syn; Trilobus steineri Micoletzky, 1925 (ref. ID; 3570)
  71. Tobrilus stenurus (subsp.) (Filipjev, 1929)
    See; Tobrilus stefanskii subsp. stenurus (ref. ID; 3570)
  72. Tobrilus telekiensis (Allgen, 1952) (ref. ID; 3570)
    Syn; Trilobus telekiensis Allgen, 1952 (ref. ID; 3570)
  73. Tobrilus tenuicaudatus (Daday, 1894)
    See; Tobrilus pellucidus (ref. ID; 3570)
  74. Tobrilus tripylus Gagarin, 1991 (ref. ID; 7912 original paper)
  75. Tobrilus vibratus Sukul, 1967 (ref. ID; 3570)
  76. Tobrilus vistula Pieczynska, 1960 (ref. ID; 3570)
  77. Tobrilus wesenbergi (Micoletzky, 1925) (ref. ID; 3570, 7912)
    Syn; Trilobus wesenbergi Micoletzky, 1925 (ref. ID; 3570)
  78. Tobrilus zakopanensis (Stefanski, 1924) (ref. ID; 3570)
    Syn; Trilobus gracilis subsp. zakopanensis Stefanski, 1924 (ref. ID; 3570); Trilobus pseudallophysis Micoletzky, 1925 (ref. ID; 3570)

Tobrilus aberrans (W. Schneider, 1925) Andrassy, 1959 (ref. ID; 5972)

Descriptions

Longer cephalic setae 9-10 µm, shorter setae 5 µm, head width 28-30 µm. Stoma 13-16 µm long by 10-12 µm wide, pocket teeth 6-9 µm apart, pockets overlapping. Amphid aperture at base of stoma. Vaginal musculature weakly developed. Spermatheca and sperm not observed. Tail tapering, terminus distinctively clavate. (ref. ID; 5972)
  • Male: Unknown, female probably parthenogenetic. (ref. ID; 5972)

    Measurements

    Female: L=1.8(1.4-2.2) mm , a=27(23-32), b=4.3(3.7-4.9), c=11(10-14), c'=4(3.8-4.4), V=50(46-52) (n=4). (ref. ID; 5972)

    Tobrilus breviductus Loof & Riemann, 1976 (ref. ID; 5972)

    Descriptions

    Cephalic setae 5 µm, head width 20 µm, pocket teeth 10-11 µm apart, pockets separate. Stoma small. Sperm flagellate. Junction of ductus ejaculatoris and vas deferens at level of or slightly posterior to supplement 1. Muscles of ductus ejaculatorius running anteroventral to posterodorsal. Supplements six, S1-S3 much larger than S4-S6 with two papillae between S6 and S5, four papillae between S5 and S4, and four papillae between S4 and S3. Supplements 1 and 3 with echinulate tips. Spicule slender, with narrow capitulum, gubernaculum weakly developed. Tail tapering sharply about one-third distance to slightly expanded terminus. Small seta near tail terminus. (ref. ID; 5972)

    Measurements

    Male: L=1.55(1.40-1.80) mm , a=45(40-53), b=4.1(4.0-4.5), c=10.2(9.3-11.0), c'=4.2-4.9, spicule length 57(55-62) µm (n=5). (ref. ID; 5972)

    Tobrilus filipjevi Ebsary, 1982 (ref. ID; 5972 original paper)

    Synonym

    Tobrilus longus sensu Filipjev, 1929 nec Tobrilus longus (Leidy, 1851) (ref. ID; 5972)

    Differential diagnosis

    The male of Tobrilus filipjevi n. sp. differs significantly from T. longus by the distance between the pocket teeth (18-20 µm versus 11-14 µm) and by the spicule length (100-109 µm versus 67-84 µm). Tobrilus filipjevi differs from T. hopei by having shorter spicules (100-109 µm versus 120-122 µm), shorter head setae (9-10 µm versus 17 µm) and fewer papillae between supplements 3 and 4 (1 versus 14-19 in hopei). (ref. ID; 5972)

    Descriptions

  • Male: Body curved, cuticle thin, smooth. Longer cephalic setae 9-10 µm, about one-third head width, shorter setae 4 µm long. Stoma thin walled, 14-15 µm long by 8-11 µm wide. Amphid aperture indistinct. Teeth in two pockets, apexes 18-20 µm apart. Sperm flagellate. Ductus ejaculatorius heavily muscled, fibers running anteroventral to posterodorsal; junction with vas deferens separated by constriction, 190(170-219) µm anterior to supplement 1. Supplements 6 (S6 absent in one specimen), S1-S3 large, tips echinulate, S4-S6 smaller. Supplement 6, 14 µm anterior to cloaca. Each supplement, beginning at S6, separated from the preceding supplement by the following distances: S5, 25-45 µm; S4, 36-39 µm; S3, 85-122 µm; S2, 45-63 µm; S1, 58-79 µm. Three to four distinct papillae between S5 and S6, five to six papillae between S4 and S5, one papilla between S3 and S4 near base of S4. Spicules elongate with narrowed capitulum. Tail tapering sharply about one-third distance to slightly expanded terminus. Subdorsal seta near terminus. Crystalloids absent. (ref. ID; 5972)
  • Female: Unknown. (ref. ID; 5972)

    Remarks

    Filipjev (1929) described a T. longus male, which was examined by Loof and Riemann (1976), from a locality near Leningrad, U.S.S.R., but which was clearly differentiated from T. longus sensu stricto by its long spicules. The Canadian males of T. filipjevi n. sp. agree closely with T. longus sensu Filipjev (1929), nec (Leidy, 1851) with respect to length (1.73 mm), c=10.6; spicule length 108 µm, arragement of papillae between supplements and the 164 µm extensions of the ductus ejaculatorius anterior to supplement one. Tobrilus longus sensu Filipjev (1929) is considered synonymous with T. filipjevi n. sp. (ref. ID; 5972)

    Type habitat and locality

    Collected from aquatic mud, Yukon Porcupine River, Northwest Territories, Canada. (ref. ID; 5972)

    Type designation

    Holotype male and three paratypes slide No.267, two paratypes 267a, 267b in the Canadian National Collection of Nematodes, Ottawa. (ref. ID; 5972)

    Examined material

  • Holotype (male): L=1.7 mm, a=33, b=4.7, c=11, c'(tail length/tail width) 3.8, spicules 106 µm. (ref. ID; 5972)
  • Paratypes (five males): L=1.7-2.0 mm, a=23-28, b=4.7-5.1, c=9.8-10, c'=4.5-4.9, spicules 106 µm (100-109). (ref. ID; 5972)

    Tobrilus gracilis (Bastian, 1865) (ref. ID; 3570) or (Bastian, 1865) Andrassy, 1959 (ref. ID; 880)

    Synonym

    Trilobus gracilis Bastian, 1865 (ref. ID; 3570)

    Descriptions

    Cristalloids were present in most animals in large numbers. The males have six (49%), seven (48%) or eight (3%) preanal papillae. (ref. ID; 880)
  • Intersex: The intersex individuals found in Piburger See show all transitions from predominantly male to predominantly female features. It is conspicuous that individuals with well developed spicula and preanal papillae regularly have a poorly developed uterus and are smaller, having the same proportions as males. Individuals with a large uterus (in several cases containing eggs) reach the size of mature females and at the same time show a reduction of the secondary male sexual features (missing or only poorly developed spicula and a reduced number of preanal organs). All individuals with intersexual features had the shorter tail typical of the males of this species. These observations suggest that the individuals with intersexual features might begin their sexual development as functional males, transformiing into functional females as they grow older. (ref. ID; 880)

    Ecology

    T. gracilis is a very common freshwater nematode found in stagnant water as well as in lotic habitats (Zullini 1976). (ref. ID; 880)

    Measurements

  • Female: L(total length) 2160(1630-2850) µm, a(length/greatest width) 30.9(25.5-37.2), b(length/length of esophagus from anterior end) 5.9(5.5-6.3), c(length/length of tail, i.e. anus to tail tip) 8.1(6.9-8.9), V(distance of vulva from anterior end expressed as a precentage of the total length) 42.0(38.8-49.5)%. (ref. ID; 880)
  • Male: L=2132(1670-2680) µm, a=35.6(26.8-42.6), b=5.4(4.6-6.2), c=12.5(10.9-14.2). (ref. ID; 880)

    Tobrilus hopei Loof & Riemann, 1976 (ref. ID; 5972)

    Descriptions

  • Female: Body curved. Cuticle thin, smooth. Cephalic setae 14-16 µm long, head width 30-32 µm. Stoma cone shaped, 13-20 µm long by 12-15 µm wide. Amphid aperture not observed. Teeth in two distinct pockets, separated by 18-19 µm. Vagina with strong concentric musculature similar to that of T. longus. Spermatheca with flagellate sperm. Tail long, tapering to slightly expanded terminus with a long subterminal seta. (ref. ID; 5972)
  • Male: Head and stoma structure similar to female. Junction of ductus ejaculatorius and vas deferens 400 µm anterior to level of supplements 1. Muscles of ductus ejaculatorius running anteroventral to posterodorsal. Supplements 6, S1 to S3 large with echinulate tips, S4 medium sized, S5 and S6 small. Papillae between supplements well developed; 5 papillae between S5 and S6, 6 papillae between S4 and S5, and 14 between S3 and S4. Papillae absent between S1 and S3. Spicules elongate with slightly set off capitulum. Tail tapering abruptly posterior to cloaca to slightly expanded terminus. (ref. ID; 5972)

    Remarks

    Loof and Riemann (1976) indicated that the Peruvian specimens of T. longus described by Steiner (1920) may be females of T. hopei. The above female description of T. hopei agrees closely with the available data presented by Steiner (1920). (ref. ID; 5972)

    Measurements

  • Female: L=3.0(2.8-3.2) mm , a=44(36-58), b=5(4.3-5.6), c=8.6(7.7-9.1), c'=8-9.7, V=50(47-53) (n=4). (ref. ID; 5972)
  • Male: L=2.8 mm, a=55, b=4.7, c=11.9, c'=5.4, spicule 105 µm. (ref. ID; 5972)

    Tobrilus longicaudatus (Schneider, 1923) Andrassy, 1959 (ref. ID; 5972)

    Descriptions

  • Female: Longer cephalic setae 7-8 µm, one-third head width, shorter setae 3-4 µm long. Teeth 6-7 µm apart in two pockets. Vagina strongly muscled with slightly sigmoid lumen. Tail elongate, tapering to slightly expanded terminus. (ref. ID; 5972)
  • Male: Head and stoma structure same as female. Sperm rounded. Ductus ejaculatorius heavily muscled, fibers running anterodorsal to posteroventral, junction with vas deferens 260-430 µm anterior to level of supplement 1. Supplements 6, very small, width at base about 1/10th body width, irregularly spaced, papillae between all supplements. Supplement 6, 37-68 µm from cloaca. Beginning at S6, each supplement separated from the preceding supplement by the following distances; S5, 27-49 µm; S4, 31-59 µm; S3, 18-29 µm; S2, 40-77 µm; S1, 101-153 µm. Spicule slender, elongate with slightly set off capitulum. Tail tapering sharply midway to terminus. (ref. ID; 5972)

    Remarks

    Gagarin (1971) redescribed a species he identified as T. longicaudatus. This species differs by the short spicules from that of Schneider, (1923) and the Canadian specimens (63 µm versus 108-122 µm). Gagarin's specimens, in my opinion, represented a new species and hence are renamed Tobrils gagarini n. sp. (syn. T. longicaudatus apud Gagarin, 1971). Tobrilus gagarini n. sp. is recognized by the short spicules and grouped supplements and is related to species in the pellucidus species group, including T. pellucidus. T. parapellucidus, T. longicaudatus, and T. closlongicaudatus. (ref. ID; 5972)

    Measurements

  • Female: L=2.5(2.3-2.7) mm, a=29(23-34), b=6.3(6.0-6.8), c=6.8(6.2-7.7), c'=7.0-8.0, V=46-48 (n=5). (ref. ID; 5972)
  • Male: L=2.4(2.2-2.6), a=31-33, b=3.1-3.2, c=8.6(7.9-10.0), c'=4.5-5.2, spicules 120(108-122) µm (n=10). (ref. ID; 5972)

    Tobrilus longus (Leidy, 1851) Andrassy, 1959 (ref. ID; 5972)

    Descriptions

  • Female: Longer cephalic setae 8-9 µm, one-third head width, shorter setae 3-4 µm. Stoma thin walled, 10-13 µm long by 10-12 µm wide. Pocket teeth 11-14 µm apart, in two distinct pockets. Spermatheca with flagellated sperm. Vagina with strong, globose, concentric musculature. Setae scattered along body, long seta near tail terminus. Tail elongate tapering to slightly expanded terminus. Crystalloids absent. (ref. ID; 5972)
  • Male: Head and stoma structures same as female. Sperm flagellate. Ductus ejaculatorius heavily muscled, fibers running anteroventral to posterodorsal, junction with vas deferens 140(110-160) µm anterior to level of S1. Supplements 6, S1-S3 large, tips echinulate, base 15-20 µm, S4-S6 small. Three to four papillae between S5 and S6, five between S4 and S5, and one between S3 and S4. Crystalloids absent. Spicules rather stout, elongate, capitulum narrow. Tail tapering sharply about one-third distance to slightly expanded terminus. Subdorsal seta near tail terminus. (ref. ID; 5972)

    Measurements

  • Female: L=1.7(1.6-2.0) mm, a=28(26-29), b=4.7(4.5-5.3), c=9.5(8.5-11.0), c'=4.8-6.3, V=51(47-53) (n=10). (ref. ID; 5972)
  • Male: L=1.6(1.4-1.8) mm, a=37(30-40), b=4.8(4.4-5.2), c=9.9(8.6-11.3), c'=4.0-4.3, spicule length 74(72-78) µm (n=10). (ref. ID; 5972)

    Tobrilus parapellucidus Ebsary, 1982 (ref. ID; 5972 original paper)

    Differential diagnosis

    Tobrilus parapellucidus n. sp. is closely related to T. pellucidus. The female differs significantly in the more posterior vulva position (V=63-66 versus 38-55) and by the male having 10 supplements versus 6 in pellucidus and by the ductus ejaculatorius extending 200 µm anterior to S1 (290-420 µm in pellucidus). (ref. ID; 5972)

    Descriptions

  • Female: Body straight or C shaped, cuticle thin, smooth. Longer cephalic setae 12 µm, shorter setae 5 µm long, head width about 30 µm. Stoma cuplike, walls thin, length 11 µm, width 9 µm. Amphid aperture slightly posterior to base of cephalic setae. Teeth in two distinct pockets, apexes of teeth separated by 10 µm. Vagina well developed, heavily muscled, anteriorly directed. Sperm rounded. Tail elongate, tapering to slightly expanded terminus. Setae along body. Crystalloids numerous throughout body. (ref. ID; 5972)
  • Male: Body C shaped, posteriorly strongly recurved. Stoma and head sructure similar to female. Junction of ductus ejaculatorius and vas deferens about 200 µm anterior to supplement 1, set off by constriction. Vas deferens convoluted. Muscle fibers of ductus ejaculatorius running anterodorsal to posteroventral. Sperm rounded, small. Supplements 10, small, about 1/10th body width, irregularly spaced. Supplement 10, 48-76 µm from cloaca. Each supplement, beginning at S10 separated from the preceding supplement by the following distances; S9, 26-34 µm; S8, 26-37 µm; S7, 16-28 µm; S6, 24-45 µm; S5, 39-65 µm; S4, 54-67 µm; S3, 74-90 µm; S2, 65-87 µm; S1, 70-77 µm. Papillae absent between supplements. Spicules robust, elongate with narrowed capitulum. Gubernaculum well developed with lateral process. Setae scattered along body, a few in tail region. Tail tapered to middle then cylindrical to slightly expanded terminus. Crystalloids numerous in allotype only. (ref. ID; 5972)

    Type habitat and locality

    Collected June 1969 from clay soil in an aquatic habitat near South Procupine River, Ontario. (ref. ID; 5972)

    Type designation

    Holotype (female), allotype (male), and two paratypes (male, female) mounted on slides Nos. 266 and 266a deposited in the Canadian National Collection of Nematodes in Ottawa. (ref. ID; 5972)

    Examined material

  • Holotype (female): L=2.4 mm, a=34, b=6.1, c=8.6, c'=7.3, V=66. (ref. ID; 5972)
  • Paratype (female): L=2.3 mm, a=35, b=5.7, c=7.9, c'=8.0, V=63. (ref. ID; 5972)
  • Allotype (male): L=2.2 mm, a=41, b=5.6, c=11.7, c'=4.8, spicules 85 µm. (ref. ID; 5972)
  • Paratype (male): L=2.7 mm, a=42, b=5.7, c=11.0, c'=5.4, spicules 85 µm. (ref. ID; 5972)

    Tobrilus parvus Gagarin, 1991 (ref. ID; 7912 original paper)

    Diagnosis

    The new species is the smallest among species of the genus. It is most close to T. wesenbergi (Micoletzky, 1925), but has larger setae (in T. wesenbergi, length of longest head setae 6-9 µm, which is 35-40 percent of width of head) and subterminal seta on tail absent. (ref. ID; 7912)

    Descriptions

    Small worms, with small ringed cuticle. Males distinctly smaller than females. Body cavity stuffed with biocrytals. Heads blunt, vestibulum low. Width of head in females 18-22 µm, in males 17-20 µm. Length of large head setae in females and males 8-10 µm (40-50 percent of head width); length of head setae 6-7 µm. Buccal cavity goblet shaped, 8-9 µm wide, 14-15 µm deep. Pockets of stoma overlap each other. Openings of amfids positioned at level of lower half of stoma. Males have six supplements, typical of the genus: small, submerged under cuticle. Supplements positioned approximately at same distance from each other. Total length of supplementary row 162-185 µm. Spicules short and wide, with distinct proximal head. Steerer 12-14. Tail in representatives of both sexes long and slender. Subterminal seta absent. (ref. ID; 7912)

    Examined materials

    Eleven (female, female), 3 (male, male), 6 juveniles found in Lake Taimyr, VIII.1988 (depth 5-10 m, substrate-slit). Holotype (male) (preparation "Taimyr-18"): L=1100 µm, a=22.00, b=4.52, c=10.00, c'=3.32, spic.- 32, suppl.- 6. (ref. ID; 7912)

    Type specimens

    Type specimens are deposited in the collection of the Laboratory of Biology and Systematics of Aquatic Invertebrates of the Institute of Biology of Inland Water Bodies of the Academy of Sicences of the USSR, Borsk. (ref. ID; 7912)

    Tobrilus pellucidus (Bastian, 1865) (ref. ID; 3570) or (Bastian, 1865) Andrassy, 1959 (ref. ID; 5972)

    Synonym

    Trilobus pellucidus Bastian, 1865 (ref. ID; 3570); Trilobus leptosoma De Man, 1880 (ref. ID; 3570); Trilobus tenuicaudatus Daday, 1894 (ref. ID; 3570)

    Descriptions

    Loof and Riemann (1976) described and illustrated the male and female of this species; the Canadian male agrees closely with their data except for greater body length (2.9 mm versus 1.9-2.3 mm). (ref. ID; 5972)

    Examined material

    Male: L=2.9 mm, a=46, b=7.5, c=8.8, c'=7.1, spicules 90 µm. (ref. ID; 5972)

    Tobrilus sablensis Ebsary, 1982 (ref. ID; 5972 original paper)

    Differential diagnosis

    Tobrilus sablensis n. sp. is closely related to T. allophysis but differs in the female by the longer body (2.5-3.0 mm versus 1.6-2.1 mm), greater distance between the pocket teeth (19-21 µm versus 14-18 µm) and by the larger stoma (20-22 by 20-21 µm versus 13 by 11 µm). Males of T. sablensis and T. allophysis as described by Vinciguerra (1972) have seven supplements but T. sablensis can be readily differentiated by longer spicules (40 µm versus 34-36 µm), smaller supplements (one-eighth body width versus one-quarter body width) and by the absence of papillae between the supplements (present between all supplements in T. allophysis). (ref. ID; 5972)

    Descriptions

  • Female: Body straight or with slight ventral curvature. Cuticle thin, smooth. Longer cephalic setae 20-21 µm long, shorter setae 10-11 µm. Head with 40-45 µm. Stoma walls thick, nearly parallel, stoma length 20-22 µm, width 20-21 µm. Amphid aperture near midstoma. Pocket teeth relatively large, in two distinct pockets, each tooth separated by distance of 19-20 µm. Vagina simple, with poorly developed musculature. Spermatheca small, rounded, filled with round sperm. Small setae scattered along body. Tail elongte, tapering to slightly expanded terminus. Crystalloids absent. (ref. ID; 5972)
  • Male: Body strongly curved ventrally in tail region. Cephalic setae and stoma similar to female. Pocket teeth 16 µm apart. Sperm small, rounded. Ductus ejaculatorius obscure apparently lacking an obliquely muscled sheath. Supplements 7, weakly developed about one-eighth corresponding body width. A short seta protrudes from each supplement. Supplement 7, 53 µm from cloaca. Each supplement, beginning at S7 separated from preceeding supplement by the following distances: S6, 42 µm; S5, 35 µm; S4, 37 µm; S3, 54 µm; S2, 44 µm; and S1 27 µm. Papillae absent between supplements. Spicules tapering, capitulum narrower. Tail elongate, tapering to a slightly expanded terminus. (ref. ID; 5972)

    Type habitat and locality

    Collected in 1967 by R.H. Mulvey from lily roots growing in a pond on Sable Island, about 215 km southeast of Halifax, Nova Scotia. (ref. ID; 5972)

    Type designation

    Holotype (female), slide No.265, allotype (male) slide No.265a, 15 paratypes (female) slide No.265-265g in the Canadian National Collection of Nematodes, Ottawa. (ref. ID; 5972)

    Examined material

  • Holotype (female): L=2.7 mm, a=45, b=4.8, c=7.8, c'=8.6, V=52. (ref. ID; 5972)
  • Paratypes (15 females): L=2.8(2.5-3.0) mm, a=41(35-46), b=4.6(4.5-4.8), c=8.1(7.8-9.0), c'=8.2(7.6-9.0), V=51(49-54). (ref. ID; 5972)
  • Allotype (male): L=2.3 mm, a=51, b=4.6, c=8.7, c'=6.5, spicules 40 µm. (ref. ID; 5972)

    Tobrilus tripylus Gagarin, 1991 (ref. ID; 7912 original paper)

    Diagnosis

    The new species differs from other species of Tobrilus in its narrow, unformed buccal cavity and very short esophagus (b=6.7-8.2). (ref. ID; 7912)

    Descriptions

    Slender worms of medium size. Cuticle weakly ringed; in the body cavity, numerous biocrystals. Somatic setae sparse, length about 5 µm. Lips and lip papillae well developed. Width of lips 26-32 µm. Two circles of head setae of different length. Larger setae 8-9 µm of length (28-33 percent) of width of lips, smaller ones 6.5-7. Buccal cavity weakly sclerotized, poorly developed, narrow. Pockets of stoma positioned at on level, overlapping with each other. Openings of amfids located under head setae. Maximal width of females 81-101 µm, males 65-85 µm. Nerve ring embraces esophagnus at distance of 30-35 percent of its length from anterior margin of body. Lips of vulva retracted inside the body, do not protrude beyond its contours. Vagina muscular, walls of uterus weakly developed. In uterus, 1-2 eggs of 75-85x65-77 µm size. Tail gradually narrows, its length 2.5-2.9 times the anal body diameter. Terminus of tail slightly swollen; subterminal seta absent. Males slightly smaller than females. Seminal duct equipped with spiral muscles. Spicules short, thick, their length not less than anal body diameter. Steerer complex consists of handle and two terminal processes. Supplements small, submerged inside body, externally, under cuticle, only central spine protrudes. Their number 8-10 more often 8. Distance between supplements not equal-maximal interval between marginal organs, minimal-between median organs. Length of supplementary row 310-380 µm. In all examiend specimens, great numbers of diatom algae were found in their guts, mainly of the genera Pinnularia and Synedra. (ref. ID; 7912)

    Examined materials

    Thirty-two (female, female), 11 (male, male), 24 juveniles from a brook near Lake Taimyr, Logata, 28.VII.1988; holotype (male) (preparation "Taimyr-12, 8 st."): L=1596 µm, a=19.95, b=7.09, c=16.63, c'=2.41, suppl. 8. Allotype (female) (preparation "Taimyr-12, 2 st."): L=1665 µm, a=20.56, b=6.48, c=12.5, V=45.65 percent, c'=3.14. (ref. ID; 7912)

    Type specimens

    Type specimens are deposited in the collection of the Laboratory of Biology and Systematics of Aquatic Invertebrates of the Institute of Biology of Inland Water Bodies of the Academy of Sicences of the USSR, Borsk. (ref. ID; 7912)