Minagrion, in Santos, 1965

Vilela, Diogo Silva, Anjos-Santos, Danielle, Koroiva, Ricardo, Cordero-Rivera, Adolfo & Guillermo-Ferreira, Rhainer, 2020, Revision of the genus Minagrion Santos, 1965 (Odonata: Coenagrionidae), Zootaxa 4786 (2), pp. 176-198 : 180

Key to females of Minagrion

1. Posterior margin of prothorax not divided by the posterior lobe in lateral view ( Fig. 7c); width of the lateral margin of prothorax uniform throughout its extension ( Fig. 7c).................................................... M. mecistogastrum

1’. Posterior margin of prothorax interrupted by the margin of the posterior lobe in lateral view ( Fig. 7e); lateral margin of prothorax widens towards the base (as in Fig. 7e)................................................................. 2

2. Posterior lobe of prothorax entire in dorsal view (i.e. not divided into additional lobes, Fig. 6 a–c)...................... 3

2’. Posterior lobe of prothorax trilobed in dorsal view (i.e. lateral clefts dividing the lobe into: two lateral and one middle lobe, Figs. 6 d–f)........................................................................................... 4

3. Posterior lobe of prothorax medially concave in dorsal view ( Fig. 6c), laterally slightly elevated ( Fig. 7b); lateral margin of prothorax widens towards the base ( Fig. 7b); genital valves slightly surpass S10 posterior margin ( Fig. 9f).... M. canaanense

3’. Posterior lobe of prothorax slightly convex, posteriorly oriented in dorsal view ( Fig. 6 a–b); lateral margin of prothorax slightly widens towards the base ( Fig. 7a); anterior portion of tubercle ventrally pronounced, apex slightly excavated ( Fig. 2 c–d); genital valves surpass S10 margin for a distance as long as the segment, reaching level of cercus ( Figs. 5b, e, 9c).... M. caldense

4. Middle lobe of posterior margin of prothorax the larger in dorsal view ( Fig. 6f); lateral lobes erected, middle lobe posteriorly directed in lateral view ( Fig. 7e); lateral margin of prothorax slightly widens towards the base ( Fig. 7e); tubercle digit-like with a rounded apex ( Fig. 2l)........................................................................ M. waltheri

4’. Three lobes of posterior margin of prothorax subequal in size in dorsal view ( Fig. 6e); lateral and middle lobes slightly erect in lateral view ( Fig. 7d); lateral margin of prothorax widens greatly towards the base ( Fig. 7d); tubercle roughly triangular ( Fig. 2j)......................................................................................... M. ribeiroi