Minagrion 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

Minagrion Santos, 1965

Type species: Telagrion mecistogastrum Santos, 1965 by original designation.

Santos (1965b): 9 (genus proposed with M. mecistrogastrum as the type species and including Agrion waltheri , Telagrion ribeiroi and M. caldense sp. nov.);— Santos (1967): 7−9 (original description of M. canaanense ♂ and ♀);— Garrison (1991): 13 (synonymic list);— Carvalho & Nessimian (1998): 13 (habit and habitats of larvae occurring in Rio de Janeiro State);— Costa & Mascarenhas (1998): 11 (Catalogue of types housed in the MNRJ, comments);— Costa et al. (2000): 12 (species list, records, distribution, references);— Lencioni (2004): 91−92 (relationships of Minagrion with Telagrion );— Costa et al. (2001): 437, 440, 446 (species list, mention of M. ribeiroi );— Lencioni (2006): 17, 43, 169−173 (diagnosis, illustrations, distribution);— Heckman (2008): 299, 335−337 (key, illustrations, distribution);— Garrison et al. (2010): 134, 287−289 (generic key, diagnosis, illustrations, distribution, habitat, comments);— Côrtes et al. (2011): 136 (distribution of M. waltheri in Tocantins State);— Hämäläinen (2013): 30 (mention of M. waltheri named after Walthère de Selys Longchamps);— Machado & Bedê (2015): 290−291, 294 (occurrence of M. waltheri ; description of M. franciscoi , additional distribution of M. caldense in Minas Gerais State as “ Minagrion caldensis ” in p. 294, illustration of genital ligula, comparison with Minagrion franciscoi ).— Vilela et al. (2016): 489 (distribution of M. waltheri in Minas Gerais State, ecological data);— Lencioni (2017): 247, 383−396 (diagnosis, illustrations, distribution);— Renner et al. (2017): 3−6 (distribution of M. waltheri in Rio Grande do Sul State);— Rodrigues & Roque (2017): 2 (distribution of M. waltheri in Mato Grosso do Sul State);— Dalzochio et al. (2018): 6 (distribution of M. waltheri in Rio Grande do Sul State).

Other species included. Minagrion waltheri , Minagrion ribeiroi , Minagrion caldense , Minagrion canaanense , Minagrion franciscoi new syn.

Diagnosis. Medium to large coenagrionids (28–61 mm, Figs. 1 a–f, 5a–j); male anal appendages forcipate with a medial longitudinal ridge on medial surface of cercus: apically armed with a rounded sclerotized lobe (dorsal plate); the ventral portion of which forms a ventrobasal expansion varying in size (see Figs. 3 a–x, 8a–h); paraprocts vestigial with an acute tip, shorter or subequal to 1/2 cercus; genital ligula with an inner fold next to flexure, sclerotized lateral process at the flexure, apex entire (e.g. Fig. 4 a–b) or bifid ( Fig. 4c ), surpassing level of or almost at the same level of inner fold ( Fig. 4e ); female posterior lobe of prothorax slightly convex, uni- ( Fig. 6 a–c) or trilobate ( Fig. 6 d–f) in dorsal view; in lateral view, posterior margin of prothorax entire ( Fig. 7c ) or divided ( Fig. 7 a–b, d–e) in the posterior lobe region, notopleural suture a sinuous ( Fig. 7c ) or smoothly curved line ( Fig. 7b ); S8 with no vulvar spine ( Fig. 9c, f, i, l ); vulvar laminae always surpassing posterior margin of S10, reaching or not the level of cercus; presence of a longitudinal process (here called tubercle) on both sexes, which consists in a thin projection on the venter of S1, larger on males (e.g. Figs. 2 a–l).

Distribution. Endemic to Brazil predominantly in the Southeastern region.

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 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.