Key to known species of Cycloppia

1. Sensillus bacilliform; adanal lyrifissure located in paraanal position; body size: 340–369 × 205–313............................................................... C. latisternum (J. Balogh & P. Balogh, 1986) . Distribution: New Guinea

- Sensillus with dilated medio-distal part; adanal lyrifissure located in inverse apoanal position........................ 2

2. Interlamellar seta absent; lamellar seta inserted nearer to bothridium than to rostral seta............................ 3

- Interlamellar seta present; lamellar seta inserted nearer to rostral seta than to bothridium............................ 4

3. Rostrum with median indentation; alveolus of interlamellar seta absent; body size: 547–581 × 315–348........................................................................................ C. asetosa sp. nov. Distribution: India

- Rostrum rounded; alveolus of interlamellar seta present; body size: 381–431 × 232–265............................................................................................... C. spindleformis sp. nov. Distribution: India

4. Body surface densely granulate; body size: 467 × 273.................. C. granulata Ohkubo, 2003 . Distribution: Japan

- Body surface smooth................................................................................. 5

5. Sensillus clavate; interlamellar region with three pairs of muscle sigillae; body size: 652 × 465............................................................................... C. szentirmayi (Balogh, 1970) . Distribution: New Guinea

- Sensillus spindle-form; interlamellar region without or with two pairs of muscle sigillae; body size: 420–460 × 240–280..... C. restata (Aoki, 1963) (= Lanceoppia simplex Suzuki, 1973) (see also Suzuki 1973; Ohkubo 2003). Distribution: Japan and Taiwan