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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Oncholaimus

Oncholaimus Dujardin, 1845 (ref. ID; 3570)

Enoplida Filijev, 1929: Family Oncholaimidae Filipjev, 1916: Subfamily Oncholaiminae Filipjev, 1916 (ref. ID; 3570)

Enoplida (ref. ID; 6180)

ref. ID; 1663

Stoma with three large teeth. Spinneret at tip body. Rare species. (ref. ID; 1663)

ref. ID; 3570

Type species

Oncholaimus attenuatus Dujardin 1845, subsequent designation by Stiles and Hassal 1905 (ref. ID; 3570)
  1. Oncholaimus abyssorum Allgen, 1933
    See; Viscosia abyssorum (ref. ID; 3570)
  2. Oncholaimus acuticauda Allgen, 1935 (ref. ID; 3570)
  3. Oncholaimus (Oncholaimus s. str.) aegypticus Steiner, 1921 (ref. ID; 3570)
  4. Oncholaimus aequedentatus Stekhoven & Adam, 1931
    See; Metaparoncholaimus campylocercus (ref. ID; 3570)
  5. Oncholaimus albidus Bastian, 1865
    See; Metoncholaimus albidus (ref. ID; 3570)
  6. Oncholaimus angustatus Cobb, 1890 (1889?)
    See; Viscosia angustata (ref. ID; 3570)
  7. Oncholaimus antarcticus Linstow, 1896
    See; Metoncholaimus antarcticus (ref. ID; 3570)
  8. Oncholaimus anthophorus Ssaweljev, 1912
    See; Metoncholaimus anthophorus (ref. ID; 3570)
  9. Oncholaimus (Oncholaimus s. str.) apostematus Wieser, 1959 (ref. ID; 3570)
  10. Oncholaimus (Oncholaimus s. str.) appendiculatus (Cobb, 1930) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium appendiculatum Cobb, 1930 (ref. ID; 3570)
  11. Oncholaimus aquaedulcis Schneider, 1937 (ref. ID; 1762), Oncholaimus (Oncholaimus s. str.) aquaedulcis W. Schneider, 1937 (ref. ID; 3570)
  12. Oncholaimus armatus Daday, 1901
    See; Oncholaimus (s. str.) dujardinii (ref. ID; 3570)
  13. Oncholaimus assimilis De Man, 1876
    See; Eurystomina assimilis (ref. ID; 3570)
  14. Oncholaimus (Oncholaimus s. str.) attenuatus Dujardin, 1845 (ref. ID; 3570)
    Syn; Oncholaimus rugosus Stekhoven, 1931 (ref. ID; 3570)
  15. Oncholaimus (Oncholaimus s. str.) bajulus Paramonov, 1937 (ref. ID; 3570)
  16. Oncholaimus balticus Allgen, 1935
    See; Oncholaimus (s. str.) conicauda (ref. ID; 3570)
  17. Oncholaimus barbatus (Carter, 1859) De Coninck & Stekhoven, 1933 (ref. ID; 3570)
    Syn; Urolabes barbata Carter, 1859 (ref. ID; 3570)
  18. Oncholaimus bollonsi Ditlevsen, 1930
    See; Oncholaimus (s. str.) dujardinii (ref. ID; 3570)
  19. Oncholaimus brachycercoides Allgen, 1933
    See; Pontonema brachycercoides (ref. ID; 3570)
  20. Oncholaimus (Oncholaimus s. str.) brachycercus De Man, 1889 (ref. ID; 3570)
    Syn; Oncholaimus brachyuris Allgen, 1929 (ref. ID; 3570)
  21. Oncholaimus brachyuris Allgen, 1929
    See; Oncholaimus (s. str.) brachycercus (ref. ID; 3570)
  22. Oncholaimus (Oncholaimus s. str.) brevicaudatus Filipjev, 1918 (ref. ID; 3570)
  23. Oncholaimus brevicaudatus Menzel, 1920
    See; Pontonema brevicaudatoides (ref. ID; 3570)
  24. Oncholaimus brevicaudatus (Kreis, 1932)
    See; Oncholaimus (s. str.) brevicaudiculatus Rachor, 1970 (ref. ID; 3570)
  25. Oncholaimus (Oncholaimus s. str.) brevicaudiculatus Rachor, 1970 (ref. ID; 3570)
    Syn; Oncholaimium brevicaudatum Kreis, 1932 (ref. ID; 3570)
  26. Oncholaimus (Oncholaimus s. str.) brevisetosus Kreis, 1932 (ref. ID; 3570)
  27. Oncholaimus (Oncholaimus s. str.) brevispiculum (Mawson, 1957) Wieser & Hopper, 1967 (ref. ID; 3570)
    Syn; Metoncholaimus brevispiculum Mawson, 1957 (ref. ID; 3570)
  28. Oncholaimus (Oncholaimus s. str.) campbelli Allgen, 1929 (ref. ID; 3570)
  29. Oncholaimus (Oncholaimus s. str.) campylocercoides De Coninck & Stekhoven, 1933 (ref. ID; 3570)
  30. Oncholaimus campylocercus De Man, 1876
    See; Metaparoncholaimus campylocercus (ref. ID; 3570)
  31. Oncholaimus carnleyensis Ditlevsen, 1921
    See; Viscosia carnleyensis (ref. ID; 3570)
  32. Oncholaimus (Oncholaimus s. str.) cavatus Gerlach, 1956 (ref. ID; 3570)
  33. Oncholaimus (Oncholaimus s. str.) ceterus Filipjev, 1946 (ref. ID; 3570)
  34. Oncholaimus chilkensis Stewart, 1914
    See; Adoncholaimus chilkensis (ref. ID; 3570)
  35. Oncholaimus (Oncholaimus s. str.) chiltoni Ditlevsen, 1930 (ref. ID; 3570)
  36. Oncholaimus (Oncholaimus s. str.) circulus Wieser, 1953 (ref. ID; 3570)
  37. Oncholaimus (Oncholaimus s. str.) cobbi (Kreis, 1932) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium cobbi Kreis, 1932 (ref. ID; 3570)
  38. Oncholaimus conicauda Filipjev, 1929 (ref. ID; 3282), Oncholaimus (Oncholaimus s. str.) conicauda Filipjev, 1929 (ref. ID; 3570)
    Syn; Oncholaimus balticus Allgen, 1935 (ref. ID; 3570)
  39. Oncholaimus conicaudatus Allgen, 1928 (ref. ID; 3570)
  40. Oncholaimus (Oncholaimus s. str.) curvicauda Allgen, 1957 (ref. ID; 3570)
  41. Oncholaimus cylindricaudatus Allgen, 1932 (ref. ID; 3570)
  42. Oncholaimus deconincki Heyns & Coomans, 1977 (ref. ID; 1762)
  43. Oncholaimus demani Ditlevsen, 1918
    See; Ditlevsenella danica (ref. ID; 3570)
  44. Oncholaimus demani Zur Strassen, 1894
    See; Metoncholaimus demani (ref. ID; 3570)
  45. Oncholaimus derjugini Ssaweljev, 1912
    See; Adoncholaimus derjugini (ref. ID; 3570)
  46. Oncholaimus (Oncholaimus s. str.) diversidens Fuchs, 1938 (ref. ID; 3570)
  47. Oncholaimus (Oncholaimus s. str.) domesticus (Chitwood & Chitwood, 1938) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium oxure subsp. domesticum Chitwood & Chitwood, 1938 (ref. ID; 3570)
  48. Oncholaimus (Oncholaimus s. str.) donsi (Allgen, 1947) Wieser, 1953 (ref. ID; 3570)
    Syn; Viscosia donsi Allgen, 1947 (ref. ID; 3570)
  49. Oncholaimus (Oncholaimus s. str.) dujardinii De Man, 1876 (ref. ID; 3570)
    Syn; Oncholaimus armatus Daday, 1901 (ref. ID; 3570); Oncholaimus bollonsi Ditlevsen, 1930 (ref. ID; 3570); Oncholaimus exilis Cobb, 1890 (ref. ID; 3570); Oncholaimus parasteineri (ref. ID; 3570); Oncholaimus steineri Stekhoven, 1950 (ref. ID; 3570)
  50. Oncholaimus (Oncholaimus s. str.) dujardinioides Chitwood, 1960 (ref. ID; 3570)
  51. Oncholaimus echini Leydig, 1854 (ref. ID; 3570)
  52. Oncholaimus electus Rachor, 1969
    See; Pseudoncholaimus elegans (ref. ID; 3570)
  53. Oncholaimus (Oncholaimus s. str.) elegans Kreis, 1932 (ref. ID; 3570)
  54. Oncholaimus esknaesicus (subsp.) G. Schneider, 1906
    See; Oncholaimus (s. str.) oxyuris (ref. ID; 3570)
  55. Oncholaimus exilis Cobb, 1890 (? 1889)
    See; Oncholaimus (s. str.) dujardinii (ref. ID; 3570)
  56. Oncholaimus filicaudatus Ditlevsen, 1926
    See; Filoncholaimus filicaudatus (ref. ID; 3570)
  57. Oncholaimus (Oncholaimus s. str.) flagellatus Gerlach, 1967 (ref. ID; 3570)
  58. Oncholaimus (Oncholaimus s. str.) flexus Wieser, 1953 (ref. ID; 3570)
  59. Oncholaimus fovearum Dujardin, 1845 (ref. ID; 3570)
    Transferred to Mononchus by Bastian, 1865 (ref. ID; 3570)
  60. Oncholaimus fuscus Bastian, 1865
    See; Adoncholaimus fuscus (ref. ID; 3570)
  61. Oncholaimus gasoeensis Allgen, 1929 (ref. ID; 3570)
  62. Oncholaimus glaber Bastian, 1865
    See; Viscosia glabra (ref. ID; 3570)
  63. Oncholaimus (Oncholaimus s. str.) gladius Gerlach, 1956 (ref. ID; 3570)
  64. Oncholaimus (Oncholaimus s. str.) groenlandicus Ditlevsen, 1926 (ref. ID; 3570)
  65. Oncholaimus gunneri Allgen, 1933
    See; Pontonema balticum (ref. ID; 3570)
  66. Oncholaimus (Oncholaimus s. str.) incurvatus Ditlevsen, 1930 (ref. ID; 3570)
  67. Oncholaimus indicus Linstow, 1907
    See; Adoncholaimus indicus (ref. ID; 3570)
  68. Oncholaimus (Oncholaimus s. str.) keiensis Kreis, 1932 (ref. ID; 3570)
  69. Oncholaimus (Oncholaimus s. str.) lanceolatus Vitiello, 1970 (ref. ID; 3570)
  70. Oncholaimus langrunensis De Man, 1890
    See; Viscosia langrunensis (ref. ID; 3570)
  71. Oncholaimus lepidus De Man, 1889
    See; Adoncholaimus lepidus (ref. ID; 3570)
  72. Oncholaimus (Oncholaimus s. str.) leptos Mawson, 1958 (ref. ID; 3570)
  73. Oncholaimus linstowi De Man, 1904
    See; Viscosia linstowi (ref. ID; 3570)
  74. Oncholaimus littoralis Allgen, 1929
    See; Oncholaimellus calvadosicus (ref. ID; 3570)
  75. Oncholaimus (Oncholaimus s. str.) longicaudatus (Kreis, 1932) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium longicaudatum Kreis, 1932 (ref. ID; 3570)
  76. Oncholaimus (Oncholaimus s. str.) longicavatus Kreis, 1932 (ref. ID; 3570)
  77. Oncholaimus longidentatus Stekhoven & Adam in Stekhoven, 1931
    See; Mononcholaimus longidentatus (ref. ID; 3570)
  78. Oncholaimus (Oncholaimus s. str.) longispiculosus Gerlach, 1955 (ref. ID; 3570)
  79. Oncholaimus (Oncholaimus s. str.) longissimus Allgen, 1959 (ref. ID; 3570)
  80. Oncholaimus (Oncholaimus s. str.) longus (Wieser, 1953) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium longum Wieser, 1953 (ref. ID; 3570)
  81. Oncholaimus macrolaimus Southern, 1914
    See; Pontonema macrolaimus (ref. ID; 3570)
  82. Oncholaimus (Oncholaimus s. str.) malgassus Gerlach, 1958 (ref. ID; 3570)
  83. Oncholaimus (Oncholaimus s. str.) manilius Gerlach, 1957 (ref. ID; 3570)
  84. Oncholaimus (Oncholaimus s. str.) marinus Schulz, 1932 (ref. ID; 3570)
  85. Oncholaimus (Oncholaimus s. str.) martini Wieser, 1959 (ref. ID; 3570)
  86. Oncholaimus (Oncholaimus s. str.) medius Kreis, 1928 (ref. ID; 3570)
  87. Oncholaimus megastoma Eberth, 1863
    See; Prooncholaimus megastoma (ref. ID; 3570)
  88. Oncholaimus (Oncholaimus s. str.) menzeli W. Schneider, 1937 (ref. ID; 3570)
  89. Oncholaimus (Oncholaimus s. str.) microdon Ditlevsen, 1930 (ref. ID; 3570)
  90. Oncholaimus monodon Ditlevsen, 1930
    See; Phaenoncholaimus monodon (ref. ID; 3570)
  91. Oncholaimus muscorum Dujardin, 1845 (ref. ID; 3570)
    Transferred to Mononchus by Bastian, 1865 (ref. ID; 3570)
  92. Oncholaimus (Oncholaimus s. str.) nigrocephalatus Cobb, 1930 (ref. ID; 3570)
  93. Oncholaimus (Oncholaimus s. str.) notolangrunensis Allgen, 1959 (ref. ID; 3570)
  94. Oncholaimus (Oncholaimus s. str.) notoviridis Allgen, 1958 (ref. ID; 3570)
  95. Oncholaimus (Oncholaimus s. str.) notoxyuris Allgen, 1959 (ref. ID; 3570)
  96. Oncholaimus (Oncholaimus s. str.) onchouris Ditlevsen, 1928 (ref. ID; 3570)
  97. Oncholaimus (Oncholaimus s. str.) opisthonchus Filipjev, 1927 (ref. ID; 3570)
  98. Oncholaimus orientalis Cobb, 1890 (? 1889)
    See; Metaparoncholaimus orientalis (ref. ID; 3570)
  99. Oncholaimus oxyuris Ditlevsen, 1911 (ref. ID; 3282) reported author and year? (ref. ID; 1729), Oncholaimus (Oncholaimus s. str.) oxyuris Ditlevsen, 1911 (ref. ID; 3570)
    Syn; Oncholaimus esknaesicus (subsp.) G. Schneider, 1906 (ref. ID; 3570)
  100. Oncholaimus oxyuroides Allgen, 1934
    See; Adoncholaimus oxyuroides (ref. ID; 3570)
  101. Oncholaimus papillosus Eberth, 1863
    See; Viscosia papillosa (ref. ID; 3570)
  102. Oncholaimus parachiltoni Allgen, 1934 (ref. ID; 3570)
  103. Oncholaimus (Oncholaimus s. str.) paradujardini Allgen, 1959 (ref. ID; 3570)
  104. Oncholaimus (Oncholaimus s. str.) paraegypticus Mawson, 1956 (ref. ID; 3570)
  105. Oncholaimus (Oncholaimus s. str.) paralangrunensis (Allgen, 1947) Wieser, 1953 (ref. ID; 3570)
    Syn; Viscosia paralangrunensis Allgen, 1947 (ref. ID; 3570)
  106. Oncholaimus parasteineri (ref. ID; 3570)
    Syn; Oncholaimus (s. str.) dujardinii (ref. ID; 3570)
  107. Oncholaimus (Oncholaimus s. str.) paredron (Mawson, 1958) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium paredron Mawson, 1958 (ref. ID; 3570)
  108. Oncholaimus (Oncholaimus s. str.) paroxyuris Stekhoven, 1942 (ref. ID; 3570)
  109. Oncholaimus pellucidus Cobb, 1898
    See; Viscosia pellucida (ref. ID; 3570)
  110. Oncholaimus (Oncholaimus s. str.) plavmornini Filipjev, 1927 (ref. ID; 3570)
  111. Oncholaimus priapulus Wieser, 1959 (ref. ID; 3570)
  112. Oncholaimus pristiurus Zur Strassen, 1894
    See; Metoncholaimus pristiurus (ref. ID; 3570)
  113. Oncholaimus propinquus Allgen, 1930
    See; Pontonema propinquum (ref. ID; 3570)
  114. Oncholaimus punctatus Cobb, 1914
    See; Adoncholaimus punctatus (ref. ID; 3570)
  115. Oncholaimus (Oncholaimus s. str.) rapax Kreis, 1932 (ref. ID; 3570)
    Syn; Viscosia pacifica Allgen, 1951 (ref. ID; 3570)
  116. Oncholaimus (Oncholaimus s. str.) rhopalocercus Stekhoven, 1942 (ref. ID; 3570)
  117. Oncholaimus rivalis Leydig, 1854 (ref. ID; 3570)
    Transferred to Diplogaster by Butschli, 1873 (ref. ID; 3570)
  118. Oncholaimus roervikensis Allgen, 1946 (ref. ID; 3570)
  119. Oncholaimus (Oncholaimus s. str.) rotundicaudatus Allgen, 1959 (ref. ID; 3570)
  120. Oncholaimus rugosus Stekhoven, 1931
    See; Oncholaimus (s. str.) attenuatus (ref. ID; 3570)
  121. Oncholaimus sahariensis Coomans & Heyns, 1983 (ref. ID; 1762 original paper)
  122. Oncholaimus (Oncholaimus s. str.) scanicus (Allgen, 1935) Wieser, 1953 (ref. ID; 3570)
    Syn; Viscosia scanica Allgen, 1935 (ref. ID; 3570)
  123. Oncholaimus (Oncholaimus s. str.) septentrionalis Filipjev, 1927 (ref. ID; 3570)
  124. Oncholaimus serpens Cobb, 1930 (ref. ID; 3570)
  125. Oncholaimus (Oncholaimus s. str.) serratus Allgen, 1935 (ref. ID; 3570)
  126. Oncholaimus (Oncholaimus s. str.) sheri (Chitwood, 1960) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium sheri Chitwood, 1960 (ref. ID; 3570)
  127. Oncholaimus similis Southern, 1914
    See; Pontonema simile (ref. ID; 3570)
  128. Oncholaimus (Oncholaimus s. str.) skawensis Ditlevsen, 1921 (ref. ID; 3570)
  129. Oncholaimus spiralis Linstow, 1908 (ref. ID; 3570)
  130. Oncholaimus (Oncholaimus s. str.) spissus Allgen, 1935 (ref. ID; 3570)
  131. Oncholaimus (Oncholaimus s. str.) steinboecki Ditlevsen, 1928 (ref. ID; 3570)
  132. Oncholaimus (Oncholaimus s. str.) steineri Ditlevsen, 1928 (ref. ID; 3570)
  133. Oncholaimus steineri Stekhoven, 1950
    See; Oncholaimus (s. str.) dujardinii (ref. ID; 3570), Oncholaimus paraseineri (ref. ID; 3570)
  134. Oncholaimus tenuicaudatus Allgen, 1932 (ref. ID; 3570)
  135. Oncholaimus thalassophygas De Man, 1876
    See; Adoncholaimus thalassophygas (ref. ID; 3570)
  136. Oncholaimus (Oncholaimus s. str.) thysanouraios (Mawson, 1958) Wieser & Hopper, 1967 (ref. ID; 3570)
    Syn; Metoncholaimus thysanouraios Mawson, 1958 (ref. ID; 3570)
  137. Oncholaimus (Oncholaimus s. str.) tobagoensis Allgen, 1947 (ref. ID; 3570)
  138. Oncholaimus trichospiculum Allgen, 1947 (ref. ID; 3570)
    Syn; Metoncholaimus trichospiculum (ref. ID; 3570)
  139. Oncholaimus (Oncholaimus s. str.) ushakovi Filipjev, 1927 (ref. ID; 3570)
  140. Oncholaimus (Oncholaimus s. str.) vesicarius (Wieser, 1959) Rachor, 1969 (ref. ID; 3570)
    Syn; Oncholaimium vesicarium Wieser, 1959 (ref. ID; 3570)
  141. Oncholaimus (Oncholaimus s. str.) viridis Bastian, 1865 (ref. ID; 3570)
  142. Oncholaimus viscosus Bastian, 1865
    See; Viscosia viscosa (ref. ID; 3570)
  143. Oncholaimus vulgaris Bastian, 1865
    See; Pontonema vulgare (ref. ID; 3570)

Oncholaimus aquaedulcis Schneider, 1937 (ref. ID; 1762), Oncholaimus (Oncholaimus s. str.) aquaedulcis W. Schneider, 1937 (ref. ID; 3570)

Descriptions

Schneider reported this species from East Java. (ref. ID; 1762)

Oncholaimus deconincki Heyns & Coomans, 1977 (ref. ID; 1762)

Descriptions

Heyns & Coomans reported this species from a freshwater habitat in South Africa. (ref. ID; 1762)

Oncholaimus oxyuris Ditlevsen, 1911 (ref. ID; 3282) reported author and year? (ref. ID; 1729), Oncholaimus (Oncholaimus s. str.) oxyuris Ditlevsen, 1911 (ref. ID; 3570)

Synonym

Oncholaimus esknaesicus (subsp.) G. Schneider, 1906 (ref. ID; 3570)

Desriptions

Marine nematode. (ref. ID; 1729)

Oncholaimus sahariensis Coomans & Heyns, 1983 (ref. ID; 1762 original paper)

Diagnosis

Oncholaimus sahariensis sp. n. differs from the two other freshwater species in the shape of the female tail and the pronounced sexual dimorphism in tail shape, and in the more posterior vulva position (V=63 in O. aquaedulcis and 63-67 in O. deconincki). It further differs from O. aquaedulcis W. Schneider, 1937 in the length of the spicules (100 µm in O. aquaedulcis) and from O. deconincki Heys & Coomans, 1977 µm in its smaller body size (L=3.72-4.13 mm in female and 3.20-3.77 mm in male of O. deconincki), length of the spicules (35-41 µm in O. deconincki) and details of the demanian system, e.g. much longer ductus entericus and larger number of terminal pores. (ref. ID; 1762)

Descriptions

  • Female: Body almost straight or forming loops upon fixation. Cuticle smooth, showing little differentiation in optical section. Inner layer double in lip region, forming a cephalic capsule. Sparse sublateral somatic setae present throughout body, but mainly near both ends. Of the nine sublateral setae in neck region, six are in front of the nerve ring. Between the anterior end and the nerve ring there are also four subdorsal and five (four) subventral setae. Epidermis with tessellated appearance; nuclei of the chord cells mostly clear though less so than in the juveniles, the anteriormost one is a ventral chord nucleus, whereas the most anterior lateral nucleus is further back than the most anterior dorsal chord nucleus. Glandular organs occur at irregular intervals, mainly in the lateral chords. Metanemes not seen. Head continuos with body contour; six lips with a circlet of six inner labial papillae (i.l.p.) and a circlet of six longer (7-9 µm) outer labial setae (o.l.s.) and four shorter (6.5 µm) cephalic setae (c.s.). The exact length of the setae, especially the o.l.s., may be difficult to measure due to foreshortening. I.l.p. and o.l.s. 7.5 µm apart. Amphids with stirrup- or cup-shaped, shallow fovea and bent oval apertures 7.5 µm wide, situated at 16.5 (15.5) µm posterior to the lateral i.l.p. and 7.5 (8.0) µm posterior to the lateral o.l.s. Head width at level of setae: 27.5 (28.5) µm. Buccal cavity 34 µm deep and 17 (19) µm wide; its walls about 3 µm thick, heavily cuticularized and composed of three sets of plates: anterior oblique cheilorhabdia, vertical plates and oblique basal plates. The three vertical plates each bear a tooth of which the dorsal and right ventrosublateral ones are about equal in size and the left ventrosublateral one is considerably longer. Each tooth is perforated by the subterminal outlet of the corresponding pharyngeal gland. Several muscles control the protrusion and retraction of the buccal capsule: (1) labial muscles that insert on the labial cuticle of the cephalic capsule and on the vertical plates of the stoma; upon contraction these muscles pull the lips backwards; thus bringing the buccal capsule and the teeth forward; (2) stomatal muscles running from the vertical plates to the body wall; upon contraction they bring the protruded buccal capsule back to the resting position. Three of these muscles insert on the teeth. Pharynx cylindrical, anteriorly surrounding the base of the buccal capsule; strongly muscular, with at least three and probably five pharyngeal glands, the nuclei of which are in the basal portion, but only the ventrosublateral nuclei having the typical appearance of gland nuclei. Pharyngo-intestinal junction cordiform to convex-conoid, 18.5 (22) µm long and 24 (27) µm wide, surrounded by intestinal tissue. Intestine with twelve cells in circumference, sometimes bearing long, faint and loosely arranged microvilli at the anterior end, further backward with an irregular and denser covering of short, thick microvilli. Rectum slightly longer (slightly shorter) than anal body width. Anus a long transverse slit with caudally curved ends. One dorsal or subdorsal and one or two subventral setae occur in the region of the rectum. Excretory pore 61 (62) µm from anterior end. Nerve ring at 42.5 (41)% of the neck length. Tail broadly convex for about one anal body width, then abruptly narrowing to a long peg of roughly the same length as the broad basal part. A subventral and/or subdorsal seta occur close to the tail terminus; another seta is present subventrally about halfway the broad part of the tail (not present in paratype). In addition to the these some 9 (7) minute setiform protrusions occur subventrally and subdorsally in the caudal region of the female, five or them situated on the broad part of the tail, one at the junction of both parts of the tail, while the others are preanal. Each of them is located in a small depression and some seem to be connected to a small ampulla or a long anteriorly directed duct. Since such structures are not found in the male nor in juveniles, they probably represent the terminal parts of the demanian system. Spinneret small, terminal. Female monodelphic, with only the anterior reproductive branch developed, lying on the left side of the intestine. Ovary long, growing oocytes in single file, younger cells packed together near the apex; 5 (10) cell nuclei present at the anterior end of the mature oocyte. Two intra-uterine eggs in the paratype measured 92x52.5 µm and 80.5x2.5 µm. Vagina a simple, slightly anteriorly bent tube, leading to the uterus of which the distal part has a circularized wall. The ductus uterinus of the demanian system opens here. This ductus is 641(587) µm long, at first rather weakly developed with flattened cells surrounding a central lumen, then more strongly differentiated with closely packed cells containing prominent nuclei. The ductus uterinus extends on the left side of the intestine to 5(4.5) body widths in front of the anus where the ductus joins the uvette. The uvette consists of about 20 cells; it connects the ductus uterinus to left side of the remainder of the demanian system. The latter portions which are more dorsally situated, are less distinct and comprise the ductus entericus, leading to an osmosium which lies about halfway between the uvette and the vagina, and a glandular main duct running towards the tail. The terminal ducts of the system are not clear and as explained above, they apparently lead to several minute protrusions in the caudal and precaudal region. (ref. ID; 1762)
  • Male: Similar to female in gross morphology, but differing in several dimensions, tail shape and sexual characteristics. Inner labial papillae 6 µm anterior to o.l.s.; o.l.s. 7.5 µm long; c.s. 6 µm long; lateral o.l.s. 6 µm and lateral i.l.p. 13 µm anterior to amphid aperture. Head 22.5 µm side at level of setae. Amphid aperture 7 µm wide. Buccal cavity 27 µm deep and 14.5 µm wide. Excretory pore 68.5 µm and ventral gland cell 584 µm from anterior end. Nerve ring at 39% of neck length. Pharyngo-intestinal junction 16.5 µm long and 17 µm wide. Tail conoid, ventrally arcuate. A large ventromedian tubercle (5 µm high) occurs just posterior to the middle of the tail. Cloacal opening surrounded by 16 genital setae, the bases of which are connected by a faint cuticular ridge. In addition there are four subdorsal and one lateral caudal setae. Preanal supplementary organ present but rather weakly developed. Spinneret as in female. Genital musculature complex, at each side consisting of 21 preanal copulatory muscles, 5-6 adanal and caudal accessory copulatory muscles and three additional muscles running from the lateral body side to the anterior cloacal lip. Male diorchic with the two testes about equally long. Anterior testis on the right side of the intestine, posterior one also mainly on the right side but its apical end dorsal to the intestine. Spermatogonia and young primary spermatocytes small, packed together near the blind end of the testes; fully grown primary spermatocytes very big, each with a large nucleus; arranged in a single row; followed by smaller secondary spermatocytes containing smaller nucleic with condensed chromatin and arranged first in two then in three or four rows. The anterior testis is flanked by a long glandular caecum that extends slightly beyond the apical and of the testis. Both testes and the caecum join at the vesicula seminalis that contains a number of broadly oval spermatozoa and that further leads to the vas deferens. The posterior portion (272 µm) of the latter is set off from the main part by a sphincter and corresponds to the ductus ejaculatorius of other Oncholaimus although it appears to be more glandular than muscular. This ductus joins the rectum from the ventral side, this forming the cloaca. The whole vas deferens is situated on the right and ventral side of the intestine. Spicules 47.5 µm long, slightly ventrally curved, with pointed tip and slightly cephalated proximal end. (ref. ID; 1762)