Key to the Indian species of Antonina Signoret

Character states of A. meghalayaensis and A. natalensis in the key are based on Williams (2004) and Williams (2001), respectively. All the remaining species were studied using slide-mounted specimens.

1(0) Anal ring situated on surface of abdomen, not internally at inner end of anal tube.......... A. bambusae Khalid & Shafee

- Anal ring situated internally, at inner end of anal tube........................................................ 2

2(1) Multilocular disc pores forming a band around body margin.................................. A. thaiensis Takahashi

- Multilocular disc pores not forming a band around body...................................................... 3

3(2) Disc-like pores confined to posterior end of abdominal venter..................... A. meghalayaensis Khalid & Shafee

- Disc-like pores not confined to the posterior end of abdominal venter........................................... 4

4(3) Multilocular disc pores encircling the spiracles............................................................. 5

- Multilocular disc pores absent from around spiracles......................................................... 6

5(4) Antenna 2-segmented. Dorsal and ventral body margins with flagellate setae.................... A. parazonata Williams

- Antenna 3-segmented. Dorsal and ventral margins without flagellate setae......................... A. natalensis Brain

6(4) Disc-like pores with thick sclerotized rims................................................ A. graminis (Maskell)

- Disc-like pores with rims not sclerotized.................................................................. 7

7(6) Disc-like pores forming a single small group posterior to posterior spiracle........................... A. zonata Green

- Disc-like pores situated on venter of abdominal segments II–VII................................. A. maritima Ayyar