Leptophlebiidae (Imago)

Selvakumar, C., Sivaruban, T., Subramanian, K. A. & Sivaramakrishnan, K. G., 2016, A new genus and species of Atalophlebiinae (Insecta: Ephemeroptera: Leptophlebiidae) from Palni hills of the southern Western Ghats, India, Zootaxa 4208 (4), pp. 381-391 : 383

Key to known genera of south Indian Leptophlebiidae (Imago)

1. Hindwings present.....................................................................................4

- Hindwings absent.....................................................................................2

2. Claws of a pair alike, each apically hooked, with an opposing subapical hook.............................. Nathanella

- Claws of a pair dissimilar...............................................................................3

3. Anal area of forewing enlarged posteriorly; penes of male genitalia serrated at apex........................ Notophlebia

- Anal area of forewing not enlarged posteriorly; penes of male genitalia not serrated at apex.................. Isca (Isca)

4. Claws of a pair alike; each penis lobe ventromedially directed spine-like projection near apex.................. Petersula

- Claws of a pair dissimilar; each penis lobe not as above.......................................................5

5. Two intercalaries in cubital area of forewings...............................................................6

- More than two intercalaries in cubital area of forewings.......................................................7

6. Vein MP forked much nearer to base of wings than vein Rs.............................................. Thraulus

- Vein of MP forked slightly less than 1/2 of distance from base to margin.......................... Klugephlebia gen. n.

7. Veins Rs and MP forked almost equidistant from base of wings to margin............................. Choroterpes ...8

- Veins Rs and MP forked less than 1/2 or more than 1/3 of distance from base to margin..............................9

8. Vein MA forked 1/2 of distance from base of wings to margin; fork of vein MP asymmetrical; base of costal projection of hind- wings smoothly curved proximally and angular distally................................... Choroterpes (Euthraulus)

- Vein MA forked over 1/2 of distance from base of wings to margin; fork of vein MP symmetrical; base of costal projection of hindwings smoothly curved proximally and distally..................................... Choroterpes (Choroterpes)

9. Vein of MP forked less than 1/2 of distance from base to margin; apex of each penis lobe bulbous and reduced tip, outer margin of apical half each penis lobe without a row of spinules.................................................. Indialis

- Vein of MP forked more than 1/3 of distance from base to margin; apex of each penis lobe curved ventrally, outer margin of apical half each penis lobe with a row of spinules. Edmundsula ...................................................