Interactive Key to Nematodes Part II

Interactive Diagnostic Key to Plant Parasitic, Freeliving, and Predaceous Nematodes

by

UNL Nematology Lab

Adapted from:
An Illustrated Key to Nematodes Found in Fresh Water

Armen C. Tarjan (University of Florida, Lake Alfred)

Robert P. Esser (Florida Department of Agriculture, Gainesville)

Part II

Shih L. Chang (Environmental Protection Agency, Cincinnati, Oh

Part
I	III	IV

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

....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

... 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 .

63. (60) Stoma narrow and long .

.... Cryptonchus

Stoma wide and shallow .

.... Bathyonchus