Heteragrion gracile Machado, 2006

Vilela, Diogo Silva, Lencioni, Frederico A. A., Bota-Sierra, Cornelio A., Ware, Jessica L. & Bispo, Pitágoras C., 2023, Taxonomic revision of the Neotropical genus Heteragrion Selys, 1862 (Zygoptera: Heteragrionidae): male morphology, new species and illustrated key, Zootaxa 5356 (1), pp. 1-96 : 54

Heteragrion gracile Machado, 2006

( Figs. 37a–d )

[Key locator: Key to Group A species, couplet 17 (15’)]

Heteragrion gracile: Machado 2006: 1065 (description and diagnosis of ♁; figs. 3, 7, 11, 15–16);— Garrison et al. 2010: 88 (list of Heteragrion species);— Lencioni 2013: 9–10 (information on types, distribution, diagnosis; figs. 16, 31a–c, 52c, 74);— Lencioni 2017: 147–148 (general taxonomic information; distribution; figs. 71–72);—Ávila-Jr. et al. 2021: 3 (list of species for Rio das Velhas, Minas Gerais state).

Material examined. 1♁ (HOLOTYPE) BRAZIL, Minas Gerais state, Carmo do Rio Claro , 15.ix.1984, J. Augusto leg., ABMM (abdomen placed in a diferent envelope); 1 ♁ Espírito Santo State, Reserva Biológica Augusto Ruschi , 21.xii.2001, K.S. Furieri leg., FAAL .

Known distribution. Brazil (states of Minas Gerais, Espírito Santo and São Paulo).

Diagnosis and remarks. The following character combination distinguishes this species from the remainder of Group A species: ML with two parallel ridges on its medial space (unique to the genus, Fig. 37d ), plus an additional basal ridge ( Fig. 37c ); ML apex undulate ( Figs. 37c–d ).

Figures

FIGURE 37. Heteragrion gracile: (a) anterior view of head; (b) lateral view of pterothorax; (c) mediodorsal view of cercus; (d) close up of MP, showing the two-ridged ML. MP: medial portion; ML: medial lobe.