Key to known species of Hammerella (Hammerella)

1. Sensillar branches shorter than length of sensillar head; interlamellar seta longer than lamellar and rostral setae; body size: 322–352 × 190–205............................ H. (H.) pectinata (Aoki, 1983) . Distribution: Palearctic region, Taiwan

- Some sensillar branches longer than length of sensillar head; interlamellar seta not longer than lamellar and rostral setae... 2

2. Rostrum with median indentation; notogastral seta c present; body size: 332–398 × 182–215.............................................................................................. H. (H.) excisa sp. nov. Distribution: India

- Rostrum tripartite (see page 36 in Hammer 1977) or rounded (see Fig. 26 in Hammer 1977); notogastral seta c represented alveolus; body size: not data................................. H. (H.) gracilis (Hammer, 1977) . Distribution: Pakistan