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 : 179

Key to males of Minagrion (cercus in mediodorsal view, except when otherwise indicated)

1. Larger species (54−61 mm total length), abdomen 2x longer than Fw length ( Fig. 1d )................. M. mecistogastrum

1’. Medium species (31−44 mm total length), abdomen less than 2x the length of Fw (as in Fig. 1b, e )..................... 2

2. Dorsal plate of cercus broad; ventrobasal portion only 1/5 of the cercus length ( Figs. 3 u−x, 8g−h); tubercle digit-like with a rounded apex ( Fig. 2k )......................................................................... M. waltheri

2’. Dorsal plate of cercus narrow (as in Fig. 3h, t ); ventrobasal portion at least 1/2 of cercus length (as in Fig. 3t ); tubercle never digit-like or with rounded apex.......................................................................... 3

3. Longitudinal ridge of cercus not entire (i.e. disrupted along its length) forming a basal and an apical ridge, more pronounced on the distal 1/2 ( Fig. 3l ); sclerotized apex of cercus globose with no apparent teeth ( Figs. 3l , 8d ); tubercle quadrangular with a slightly concave apex ( Fig. 2e )................................................................ M. canaanense

3’. Longitudinal ridge of cercus entire (i.e., a continuous ridge along its length, as in Fig. 3d, t ); sclerotized apex of cercus not globose, with evident teeth; tubercle not as above............................................................ 4

4. Cercus shorter than S 10 in lateral view, ( Figs. 3 q–t, 8e–f) and with acute sclerotized apex, with one strong tooth ( Figs. 3t , 8e ); tubercle triangular with acute apex ( Fig. 2i )........................................................ M. ribeiroi

4’. Cercus subequal in length to S 10 in lateral view, rounded sclerotized apex, with one strong tooth; dorsal portion of cercus broad at basal half, narrowing towards the base, ventrobasal portion roughly quadrangular, reaching 1/2 of cercus ( Figs. 3 a–h, 8a–b); tubercle quadrangular, with the excavated “beak-like” apex ( Fig. 2 a–b); genital ligula with a small inner fold at the flexure in lateral view, a pair of lateral sclerotized processes, and entire apex ( Fig. 4 a–b)............................ M. caldense

Figures

FIGURE 1. Male habitus: (a) caldense, São Roque de Minas, at ECOEVO; (b) caldense, Poços de Caldas, at FAAL; (c) canaanense, Santa Tereza, at FAAL; (d) mecistogastrum, Salesópolis, at FAAL; (e) ribeiroi, Recreio dos Bandeirantes PARATYPE, at FAAL; (f) waltheri, São Gonçalo do Rio Preto, at ABMM.

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 3. Male anal appendages; (a–d) ♂ caldense, Poços de Caldas, at FAAL; (e–h) ♂ caldense, São Roque de Minas, at LESTES; (i–l) ♂ canaanense, Santa Tereza, at FAAL; (m–p) ♂ mecistogastrum, Salesópolis, at FAAL; (q–t) ♂ ribeiroi, Recreio dos Bandeirantes PARATYPE, at FAAL; (u–x) ♂ waltheri, Jaboticatubas, at FAAL.

FIGURE 4. Male genital ligula; (a) caldense, Poços de Caldas PARATYPE, at MNRJ probably lost; (b) caldense, SCNP PARA- TYPE of M. franciscoi, at ABMM; (c) canaanense, Santa Tereza, at RWG; (d) mecistogastrum, Cachoeira de Macacu, at RWG; (e) ribeiroi, Recreio dos Bandeirantes, at RWG; (f) waltheri, São Gonçalo do Rio Preto, at ABMM.

FIGURE 8. Male anal appendages of Minagrion holotypes probably lost during the fire at MNRJ in 2018; (a–b) caldense, Poços de Caldas; (c–d) canaanense, Santa Tereza; (e–f) ribeiroi (Telagrion ribeiroi), Recreio dos Bandeirantes; (g–h) waltheri (Telagrion serracipoense), Jaboticatubas.