Heteragrion muryense, Costa & Santos, 2000

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 : 70-71

Heteragrion muryense Costa & Santos, 2000

( Figs. 51a–d )

[Key locator: Key to Group A species, couplet 19 (2’)]

Heteragrion muryense : Costa & Santos 2000: 1–8 (description and diagnosis of ♁ and ♀; key to species of Heteragrion recorded to Rio de Janeiro state, ♁ in couplet 2’; figs. 1–8);— Lencioni 2005: 136 (data on description and distribution, illustration from Costa & Santos 2000; figs. 85a–h);— Machado & Bedê 2006: 50–52 (differences from H. tiradentense , H. petiense , H. flavovittatum and H. ovatum );— Garrison et al. 2010: 88 (list of Heteragrion species);— Lencioni 2013: 12 (synonymic list, types, distribution, diagnosis; figs. 20–21, 36a–c, 45a–c, 48a–b, 53a–b, 68);— Lencioni 2017: 151–152 (general taxonomic information; distribution; figs. 75–76);—Ávila-Jr. et al. 2020: 121–130 (comparison with H. itacolomii ).

Material examined. 2♁♁ BRAZIL, Rio de Janeiro state, Nova Friburgo, Pico São João , 26.i.1996, (type locality, 1500m asl), Mielke leg., ABMM .

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

Diagnosis and remarks. This is a very rare and unique species, which has been collected on only two occasions (1990 and 1996), not seen ever since, and assessed as Data Deficient in the IUCN Red List ( Vilela & Guillermo-Ferreira 2021h). The following character combination distinguishes this species from the remainder of Group A species: BP uniquely consisted of a long, narrow ventral branch ( Fig. 51c–d ); upper plate small, shaped like an inverted triangle, bearing a small row of teeth posteriorly; ridge fused with ML up to 1/2 of lower plate ( Figs. 51c–d ).

Figures

FIGURE 51. Heteragrion muryense: (a) anterior view of head; (b) lateral view of pterothorax; (c–d) mediodorsal view of cercus. BP: basal portion; ML: medial lobe.