Pseudonymus Diesing, 1857

Shah, Manjur, 2011, Nematode parasites of invertebrates from Manipur, North East India (Diagnosis, keys and illustration), Zootaxa 3107, pp. 1-37 : 7

Key to all known species of Pseudonymus Diesing, 1857

1. Two cephalic cuticular annule........................................................................... 2

- More than two cephalic cuticular annule................................................................... 5

2(1). Female tail conical................................................................................... 3

- Female tail filiform................................................................ P. leptocercus Todd, 1944

3(2). Eggs 78–88 µm in length.......................................................... P. brachycercus Todd, 1944

- Eggs less than 78 µm in length........................................................................... 4

4(3). Three pairs of caudal papillae.............................................. P. hydrophili ( Galeb,1878) Basir, 1956

- Six pairs of caudal papillae........................................................ P. basiri Shah & Rizvi, 2004

5(1). Six cephalic cuticular annule.......................................................... P. klossi Farooqui, 1967

- More than six cephalic cuticular annule................................................................... 6

6 (5). Female tail filiform.................................................................................... 7

- Female tail conical.................................................................................... 8

7(6). Nine cephalic cuticular annules.......................................... P. spirotheca ( Gyory, 1856) Diesing, 1857

- 30 cephalic cuticular annules.................................................... P. multiannulata Fotedar, 1964

8(6). Less than 60 cephalic cuticular annules................................................................... 9

- More than 60 cephalic cuticular annules............................................ P. reuhmi Gupta & Kaur, 1978

9(8). Oesophagus 0.45 mm in length............................................ P. islamabadi ( Basir, 1941) Basir, 1956

- Oesophagus less than 0.45 mm in length................................................................. 10

10(9). Three pairs of caudal papillae.......................................................... P. vazi Travassos, 1954

- Five pairs of caudal papillae............................................... P. toddi ( Travassos, 1954) Kloss, 1959