Tridactylophagus Subramaniam, 1932

Hui, Poulami, Mukherjee, Bindarika & Hazra, Niladri, 2023, A new species of the genus Tridactylophagus Subramaniam, 1932 from West Bengal India with a tentative phylogeny and world key to known males (Strepsiptera: Halictophagidae), Zootaxa 5230 (3), pp. 296-304 : 302

Key to the world species of the males of the genus Tridactylophagus Subramaniam, 1932

1. Hind wings with two detached veins between radius (R) and media (M)......................................... 2

- Hind wings with one detached vein between radius (R) and media (M).......................................... 9

2(1). Detached vein R 3 shorter than R 2......................................................................... 3

- Detached vein R 3 longer than R 2 ......................................................................... 4

3(2). Antennomere VII almost equal to preceding three segments together in length (Orient)................................................................................................. T. ceylonensis Kifune & Hirashima, 1980

- Antennomere VII almost twice as long as preceding segment i.e., antennomere VI (Orient)..................................................................................... T. maculatus Chaudhuri, Ghosh & Das Gupta, 1983

4(2). Antennomere IV half length of antennomere V............................................................. 5

- Antennomere IV longer than half length of antennomere V.................................................... 7

5(4). R 2 detached vein curved at anterolateral angle of wing (Australasia)................. T. buttonensis Kathirithamby, 1992

- R 2 detached vein not curved............................................................................ 6

6(5). R 3 detached vein broader than R 4 (Australasia)................................. T. canberraensis Kathirithamby, 1992

- R 3 detached vein as broad as R 4 (Orient)................................................. T. coniferus Yang, 1964

7(4). Antennomere IV swollen on one side........................................................ T. sufflatus sp. n.

- Antennomere IV not swollen on one side.................................................................. 8

8(7). R 3 vein small, narrow, faint and situated close to R 2 (Orient)................ T. orientalis ( Chaudhuri & Das Gupta, 1979)

- R 3 vein long, prominent and situated near tip of R 4 (Orient)................... T. aduncus M axumdar & Chaudhuri, 1999

9(1). MA 2 vein present in hind wing (Orient).............................................. T. similis Kinzelbach, 1971

- MA 2 vein absent in hind wing.......................................................................... 10

10(9). Postlumbium almost rectangular in shape (Orient).......................................... T. sinensis Yang, 1964

- Postlumbium not rectangular in shape................................................................... 11

11(10). Tips of mandibles cross each other (Orient).............................. T. carinatus Mazumdar & Chaudhuri, 1999

- Tips of mandibles not cross each other (Orient)................................... T. mysorensis Subramaniam, 1932