Epigomphus, Hagen in Selys, 1854

Haber, William A., 2017, Three new species of Epigomphus (Odonata: Gomphidae) from Costa Rica, Zootaxa 4282 (1), pp. 73-94 : 92

Key to males of Epigomphus species in Costa Rica

1. Second pale antehumeral stripe reduced to a single small posterior spot.......................................... 2

1. Second pale antehumeral stripe consisting of a stripe and a posterior spot......................................... 7

2. Epiproct distinctly shorter than cercus.................................................................... 3

2. Epiproct as long as or longer than cercus................................................................... 5

3. Apex of epiproct with two sharp points............................................................. subsimilis

3. Apex of epiproct with one short tooth..................................................................... 4

4. Tooth at apex of epiproct pointing upward........................................................ tumefactus

4. Tooth at apex of epiproct pointing inward.......................................................... houghtoni

5. Apex of epiproct in lateral view truncate, with a small sharp tooth on upper angle; dorsum of S10 with a hump..... camelus

5. Apex of epiproct in lateral view not truncate; dorsum of S10 smoothly rounded................................... 6

6. Apex of cercus in lateral view emarginate with two acute tips........................................... quadracies

6. Apex of cercus in lateral view not emarginate...................................................... verticicornis

7. Second pale antehumeral stripe broken in the middle, separate from a posterior spot................................ 8

7. Second pale antehumeral stripe unbroken and connected to posterior spot......................................... 9

8. Epiproct much longer than cercus.................................................................. echeverrii

8. Epiproct about the same length as cercus........................................................ bosquenuboso

9. Epiproct about as long as cercus........................................................................ 10

9. Epiproct distinctly shorter than cercus.................................................................... 11

10. Apex of epiproct in lateral view with lower margin rounded and upper margin ending in an acute tooth; in ventral view branches forming a V-shaped sinus with an angle less than 80 degrees.................................. subobtusus

10. Apex of epiproct with lower margin square angled and upper margin with an acute recurved tooth; in ventral view branches forming a V-shaped sinus with a 95 degree angle..................................................... morrisoni

11. In ventral view branches of epiproct forming a V-shaped angle........................................... armatus

11. In ventral view branches of epiproct not forming a V-shaped angle............................................. 12

12. In ventral view branches of epiproct forming a broadly U-shaped sinus................................. corniculatus

12. In ventral view branches of epiproct short and barely forming a shallow sinus................................ wagneri