Heteragrion dorsale Selys, 1862

Material examined. None.

Heteragrion dorsale: Selys 1862: 23–24 [21–22 reprint] (description of ♁ from Nova Friburgo);— Selys 1886: 57 (species diagnosis);— Williamson 1919: 24 (discussion);— Costa & Santos 2000: 4 (key to Heteragrion species from Rio de Janeiro, in couplet 3);—Machado 2006: 1065 (redescription of holotype);— Garrison et al, 2010: 88 (list of Heteragrion species);— Lencioni 2013: 8–9 (synonymic list, distribution, remarks);— Lencioni 2017: 141– 132 (general taxonomic information; distribution; fig. 66).

Known distribution. Brazil (Nova Friburgo, Rio de Janeiro state).

Diagnosis and remarks. This species is poorly known, with only the male holotype that is missing its cerci assigned to this name (Machado 2006). Recently, Tom Kompier collected the “real” H. dorsale in Itatiaia, Rio de Janeiro state, Brazil. The specimens compared with the holotype (housed in RBINS) were destroyed by the 2018 fire at the National Museum of Rio de Janeiro where they were deposited (RWG pers. comm.). Further collections of specimens at the type location and a further comparison with the incomplete holotype may help shed some light to this enigmatic taxon.