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

Figures

FIGURE 2. S1 tubercle; (a) ♂ caldense, Poços de Caldas, at FAAL; (b) ♂ caldense, São Roque de Minas, at LESTES; (c) ♀ caldense ALLOTYPE, Poços de Caldas, at MNRJ; (d) ♀ caldense, SCNP, at ECOEVO; (e) ♂ canaanense, Santa Tereza, at FAAL; (f) ♀ canaanense ALLOTYPE, Santa Tereza, at MNRJ; (g) ♂ mecistogastrum, Salesópolis, at FAAL; (h) ♀ mecistogastrum, Salesópolis, at FAAL; (i) ♂ ribeiroi, Recreio dos Bandeirantes PARATYPE, at FAAL; (j) ♀ ribeiroi, Salesópolis, at FAAL; (k) ♂ waltheri, São Gonçalo do Rio Preto, at ABMM; (l) ♀ waltheri, São Gonçalo do Rio Preto, at ABMM.

FIGURE 5. Female habitus; (a–c) juvenile caldense, SCNP, at LESTES; (d–f) mature caldense, SCNP, at LESTES; (g) caldense, Poços de Caldas PARATYPE, at ABMM; (h) mecistogastrum, Salesópolis, at FAAL; (i) ribeiroi Salesópolis, at FAAL; (j) waltheri, São Gonçalo do Rio Preto, at ABMM.

FIGURE 6. Female posterior lobe of prothorax; (a) caldense, Poços de Caldas ALLOTYPE, at MNRJ; (b) caldense, SCNP, at ECOEVO; (c) canaanense, Santa Tereza ALLOTYPE, at MNRJ; (d) mecistogastrum, Salesópolis, at FAAL; (e) ribeiroi, Salesópolis, at FAAL; (f) waltheri, São Gonçalo do Rio Preto, at ABMM.

FIGURE 7. Female prothorax in lateral view; (a) caldense, Poços de Caldas PARATYPE, at ABMM; (b) canaanense, Santa Tereza ALLOTYPE, at MNRJ; (c) mecistogastrum, Salesópolis, at FAAL; (d) ribeiroi, Salesópolis, at FAAL; (e) waltheri, São Gonçalo do Rio Preto, at ABMM.

FIGURE 9. Female structures of Minagrion allotypes probably lost during the fire at MNRJ in 2018; (a–c) caldense, Poços de Caldas; (d–f) canaanense, Santa Tereza; (g–i) ribeiroi (Telagrion ribeiroi), Recreio dos Bandeirantes; (j–l) waltheri (Telagrion serracipoense), Jaboticatubas.