Belostoma triangulum, Lauck, 1964

Stefanello, Fabiano, Ribeiro, José Ricardo Inacio & Estévez, Ana Lia, 2021, Revision of the Belostoma triangulum group (Insecta: Heteroptera: Belostomatidae), Zootaxa 4958 (1), pp. 95-102 : 96

Key to species of the Belostoma triangulum group

1 Lorogenal cleft with a conspicuous fovea ( Fig. 1B ); prosternal keel not prominent, projecting forward; dorsal arms of phallosoma wider at the base than at the apex ( Fig. 3A )....................................................... B. bachmanni

- Lorogenal cleft without fovea; prosternal keel prominent ( Fig. 1A ), not projecting forward; dorsal arms of phallosoma subequal in width at the base and apex ( Fig. 3D ).......................................................... B. triangulum

Figures

FIGURE 1. (A) Lateral view of the head of a typical specimen of the Belostoma showing the condition of the prosternal keel and articles of the labium II and III of B. triangulum. (B) Detail of the lorogenal cleft with a conspicuous fovea of B. bachmanni. (C) Dorsal view of the head of B. bachmanni showing the condition of the eyes, anteoculus, and interoculus. (D) Dorsal view of the head of B. triangulum showing with details of the clypeogenal and clypeoloral clefts. ant = anteoculus, int = interoculus, is = interocular space, cgc = clypeogenal cleft, clc = clypeoloral cleft, flg = fovea of lorogenal cleft, pk = prosternal keel, we = width of the eye.

FIGURE 3. (A–C) Dorsal, ventral, and lateral views of phallosoma of Belostoma bachmanni, respectively. (D–F) dorsal, ventral, and lateral views of the phallosoma of Belostoma triangulum, respectively. da = dorsal arms of phallosoma, div = diverticulum of phallosoma, pb = phallobase.