49. (39) Lip region
with rib-like armature .
.. Mononchoides
Lip
region without rib-like armature .
......Diplogaster
|
50. (38) Esophagus
with basal expansions .
....51 Esophagus
uniformly cylindrical .
....60
|
51. (50) Esophagus
without mid-region expansion .
....52 Esophagus
expanded at mid-region .
....55
|
52. (51) Amphids
distinct .
....53 Amphids
indistinct .
......54
|
53. (52) Stomat
walls anteriorly inflated with minute tooth .
.... Microlaimus
Stoma walls without tooth and with straight, tapering sides .
.... Leptolaimus
|
54. (52) Stoma with
3 rod-like thickenings .
.... Rhabdolaimus
Stoma without rod-like thickenings .
.... Monochromadora
|
55. (51) Gonads
paired .
...... 56
Gonads single .
....58
|
56. (55) Stomal
walls straight amalgamated ..
.
pic
..57 Stomal
walls separated, not straight .
.... Alloionema
|
57. (56) Moderately
swollen metacorpus, stoma not excessively elongate .
.... Rhabditis
Elongate, cyclindrical metacorpus, stoma elongate .
.... Cylindrocorpus
|
58. (55) Tail with
sharp terminus .
....59 Tail
bluntly conical .
pic
.
pic
... Cephalobus
|
59. (58) Anterior
part of stoma a broad, open chamber ..
... Panagrolaimus
|
60. (50) Stoma
absent or indistinct .
....61 Stoma
distinct .
....63
|
61. (60) Lip region
narrow, tooth absent ..
...62 Lip
region broad, small denticle apparent in stomal area ..
.
Tripyla
|
62. (61) Amphid
aperture appearing as large slit ..
... Amphidelus
Aphid aperture appearing as minute pores .
...
Alaimus
|
63. (60) Stoma narrow
and long .
.... Cryptonchus
Stoma wide and shallow .
.... Bathyonchus
|
......Diplogaster
....51 
....60
....61 
.
Tripyla
