Belostoma triangulum, Lauck, 1964

Stefanello, Fabiano & Rodrigues, Higor D. D., 2021, An enigmatic new species of Belostoma Latreille from central-western Brazil (Heteroptera: Belostomatidae: Belostomatini), Zootaxa 5005 (3), pp. 367-374 : 371

Key to the species of the Belostoma triangulum species group

(modified from Stefanello et al. 2021)

1. Antenna three–articulated, without lateral projections on antennomeres II–III; diverticulum of phallosoma sharply incised at posterior margin................................................................. Belostoma inusitatum n. sp.

1’. Antenna four–articulated, with lateral projections on antennomeres II–III; diverticulum of phallosoma convex at posterior margin.............................................................................................. 2

2. Lorogenal cleft with a conspicuous fovea; dorsal arms of phallosoma wider at the base.................... B. bachmanni

2’. Lorogenal cleft without fovea; dorsal arms of phallosoma with a uniform width along its length............. B. triangulum