Belostoma, Latreille, 1807

Ribeiro, Josė Ricardo Inacio, 2007, A review of the species of Belostoma Latreille, 1807 (Hemiptera: Heteroptera: Belostomatidae) from the four southeastern Brazilian states, Zootaxa 1477 (1), pp. 1-70 : 11-12

publication ID	https://doi.org/ 10.11646/zootaxa.1477.1.1
publication LSID	lsid:zoobank.org:pub:40401BCD-C731-44C4-9E01-A96FB3F8DF51
persistent identifier	https://treatment.plazi.org/id/CC39AC46-C123-7E59-FF66-15D7FD069926
treatment provided by	Felipe
scientific name	Belostoma
status

Treatment

Key to species of adult Belostoma View in CoL from the four southeastern Brazilian states

(Espírito Santo, Minas Gerais, Rio de Janeiro, and São Paulo)

1 Pilosity (PIL) extending along genital operculum (GOP), covering entire margin of connexivum (CON) ( Fig. 2D View FIGURE 2 ) ...................................................................................................................................................... 2

- Pilosity not extending along genital operculum, or if so, then covering one-third of margin of connexivum ( Fig. 2A–C View FIGURE 2 ).................................................................................................................................................. 6

2 Pilosity covering all or part of sternites ( Fig. 2E View FIGURE 2 ) ....................................................................................... 3

- Pilosity not on sternites ( Fig. 2D View FIGURE 2 ).................................................................................................................. ............................................... B. dilatatum ( Fig. 18B–C View FIGURE 18 ) [ Argentina, Bolivia, Brazil, Paraguay, Uruguay]

3 Inner margin of eye straight; eyes triangular ( Fig. 2I View FIGURE 2 )................................................................................... .................................................................................. B. costalimai ( Fig. 17B View FIGURE 17 ) [ Brazil, Colombia, Surinam]

- Inner margin of eye rounded; eyes usually rounded ( Fig. 2J View FIGURE 2 ) ..................................................................... 4

4 Total length (from apex of head to apex of hemelytra at rest) 26.0–34.0 mm ............................................ 5

- Total length not exceeding 21.0 mm......................................................... B. noualhieri ( Fig. 20A View FIGURE 20 ) [ Brazil]

5 Total length about twice greatest width; phallus with outer caudal lateral margins of ventral diverticulum usually sinuous in ventral view ( Fig. 15B–G View FIGURE 15 ) ............................................................................................... ........................................................... B. testaceopallidum ( Fig. 21B View FIGURE 21 ) [ Argentina, Brazil, Lesser Antilles?]

- Total length more than twice largest width of body; phallus with outer caudal lateral margins of ventral diverticulum convex instead of sinuous in ventral view ( Fig. 14C–H View FIGURE 14 ) .......... B. ribeiroi ( Fig. 20C View FIGURE 20 ) [ Brazil]

6 Total length not exceeding 20.0 mm; eyes rounded .................................................................................... 7

- Total length more than 20.0 mm; eyes rounded, subtriangular, or triangular............................................ 11

7 Prosternal keel elevated ( Fig. 11A, E, F View FIGURE 11 ), if not, then projecting anteriorly ( Fig. 11J–K View FIGURE 11 ); greatest pronotal width not twice its median length................................................................................................................ 8

- Prosternal keel not elevated and not projecting anteriorly ( Figs 12A–B; 12F View FIGURE 12 ); greatest pronotal width twice its median length, if not, then B. micantulum .................................................................................. 10

8 Greatest pronotal width only slightly more than twice its median length; dorsal arms of phallotheca always divergent ( Fig. 11L View FIGURE 11 ); ventral diverticulum of phallus slightly cleft apically in ventral view ( Fig. 11M View FIGURE 11 ) .......................................................................................................... B. sanctulum ( Fig. 20D View FIGURE 20 ) [ Brazil]

- Greatest pronotal width less than twice its median length; dorsal arms of phallotheca variable; ventral diverticulum of phallus rounded apically, without a cleft in ventral view ( Fig. 11C, H View FIGURE 11 ) ............................ 9

9 Length of segment 1 of rostrum equal to length of segment 2; posterior interocular width more than 1.5 times width of an eye; prosternal keel acute at apex ( Fig. 11A View FIGURE 11 ), not truncated; dorsal arms of phallotheca divergent ( Fig. 11B View FIGURE 11 ) ............................................... B. candidulum ( Fig. 17A View FIGURE 17 ) [ Argentina, Brazil, Uruguay]

- Length of segment 1 of rostrum only slightly shorter than length of segment 2; posterior interocular width 1.5 times width of an eye; prosternal keel truncated or obtuse at apex ( Fig. 11E–F View FIGURE 11 ); dorsal arms of phallotheca parallel or slightly convergent ( Fig. 11G View FIGURE 11 ) ...... B. horvathi ( Fig. 19C View FIGURE 19 ) [ Argentina, Brazil, Uruguay] [treated as B. oxyurum by Nieser and Melo (1997) and Ribeiro (1999)]

10 Phallus with ventral diverticulum strongly curved ( Figs 12C–E; 12G–I; 12M–O View FIGURE 12 ) .................................. 11

- Phallus with ventral diverticulum not curved ( Fig. 11D, I, N View FIGURE 11 ) ...................................................................... ............................................................................................... B. orbiculatum [ Argentina, Brazil, Uruguay]

11 Total length 13.5–16.9 mm; phallus with ventral diverticulum usually lacking a medial depression; if present then not distinct ( Fig. 12G–O View FIGURE 12 ); dorsal arms of phallotheca not covering laterodorsal margins of ventral diverticulum ( Fig. 12G, J, M View FIGURE 12 ) ............................................................................................................ ....................................... B. plebejum ( Fig. 20B View FIGURE 20 ) [ Argentina, Brazil, Paraguay, Peru, Uruguay, Venezuela]

- Total length 10.3–13.3 mm; phallus with ventral diverticulum strongly medially depressed ( Fig. 12C–E View FIGURE 12 ); dorsal arms of phallotheca covering the laterodorsal margins of ventral diverticulum ( Fig. 12C View FIGURE 12 )............... B. micantulum ( Fig. 19D View FIGURE 19 ) [ Argentina, Bolivia, Brazil, Colombia, Guyana, Paraguay, Surinam, Uruguay, Venezuela]

12 Inner margin of eye rather straight; eyes triangular ( Fig. 2I View FIGURE 2 ); greatest pronotal width more than twice its median length............................................................................................................................................. 13

- Inner margin of eye convex or sinuous with anterior part convex and posterior part concave; eyes rounded or subtriangular; greatest pronotal width less than twice its median length.............................................. 14

13 Total length usually less than twice largest width of body; anteoculus longer than interoculus; pronotum lacking yellowish or whitish longitudinal stripes .......................................................................................... ....................................... B. bergi ( Fig. 16C View FIGURE 16 ) [ Argentina, Brazil, Chile, México, Paraguay, Peru, Uruguay]

- Total length more than twice largest width of body; anteoculus equal to shorter than interoculus; pronotum with yellowish or whitish longitudinal stripes............................................................................................... ............................... B. bosqi ( Fig. 16D View FIGURE 16 ) [ Argentina, Bolivia, Paraguay, Brazil, Peru, Surinam, Venezuela]

14 Total length most often between 22.5 and 27.2 mm; eyes subtriangular with inner margin of eye always convex ............................................... B. discretum ( Fig. 18D View FIGURE 18 ) [ Argentina, Bolivia, Brazil, Paraguay, Peru]

- Total length more than 29.4 mm; eyes rounded with inner margin of eye convex or sinuous with anterior part convex and posterior part concave ..................................................................................................... 15

15 Pilosity extending along genital operculum ( Fig. 2B View FIGURE 2 )............................................................................... 16

- Pilosity not extending along genital operculum ........................................................................................ 17

16 Body elongate with its lateral margins slightly parallel; dorsum with peculiar brownish golden hairs (these can drop if handled or not correctly preserved); vertex, pronotum, and posterior part of scutellum with distinct median longitudinal carina................................................................................................................ ............................ B. aurivillianum ( Fig. 16B View FIGURE 16 ) [ Bolivia, Brazil, Colombia, Paraguay, Surinam, Venezuela]

- Body ovoid and convex; dorsum without pilosity; vertex, pronotum, and posterior part of scutellum without median longitudinal carina .............. B. cummingsi ( Fig. 17C View FIGURE 17 ) [ Argentina, Brazil, Paraguay, Uruguay]

17 Dense covering of short scalelike hairs on body (these can drop if handled or not correctly preserved); vertex, pronotum, and posterior part of scutellum with median longitudinal carina ( Fig. 21A View FIGURE 21 , LOC); scutellum not reaching nodal line (NLI); ventral diverticulum of phallus with ventroapical protuberance not distinct in lateral and ventral views ( Fig. 13C–K View FIGURE 13 ) ........... B. stollii ( Fig. 21A View FIGURE 21 ) [ Bolivia, Brazil, Guyana, French Guyana, Peru, Surinam, Venezuela]