Interactive Key to Nematodes Part IV

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 IV

Shih L. Chang (Environmental Protection Agency, Cincinnati, Ohio)

Part
I	II	III

82. (72) Stoma wide and shallow, conspicuous,

tail filiform

....... Prismatolaimus

Stoma narrow, elongate, collapsed or inconspicuous

.....83

83. (82) Gonad single .

..

.. Cylindrolaimus

Gonads paired

.....84

84. (83) Amphids inconspicuous

..... Tripyla

Amphids conspicuous

..... Aphanolaimus

85. (71) Terminal fifth or sixth of esophagus an ovoid bulb

..... 86

Esophagus uniformly cylindrical, stoma with massive teeth

......Ironus

86. (85) Cuticular punctations present

.....87

Cuticular punctations absent .

....89

87. (86) Amphids not spiral .....88

Amphids spiral

.... Achromadora

88. (87) Four longitudinal rows of cuticular markings present ..

.

. . Chromadora

No longitudinal rows of cuticular markings present ..

..

. Prochromadorella

89. (86) Amphids distinct ..

..90

Amphids indistinct .

.... Butlerius

90. (89) Female gonad double, amphid hook-shaped ..

.

..Anonchus

Female gonad single, amphid circular .

..

. Monhystrella

91. (70) Lip region annulated, not set off .

.... Atylenchus

Lip region smooth, set off .

... Eutylenchus

92. (69) Esophagus with basal expansion

.....93

Esophagus uniformly cylindrical .

....98

93. (92) Cuticular punctation present, amphids not circular .

.....94

Cuticular punctation absent, amphids circular...

.....97

94. (93) Ocelli (eye spots) present ..

.... 95

Ocelli absent ..

...96

95. (94) Stoma with three equal-sized teeth ..

... Chromadorina

Stoma with at least one large tooth ..

... Punctodora

96. (94) Cuticule with lateral longitudinal rows of punctation ...

.. Hypodontolaimus

Cuticle without lateral differentiations ..

... Chromadorita

97. (93) Esophageal bulb valvate ..

... Prodesmodora

Esophageal bulb without valves

..... Odontolaimus

98. (92) Amphid anterior on body ..

...99

Amphid posteroirly located .

.... Bastia

99. (98) Amphid spiral .

.... Paracyatholaimus

Amphid cup-shaped or obscure .....100

100. (99) Stomal teeth massive ..

... Oncholaimus

Stomal teeth small ..

.... Tobrilus