Pelocoris, Stal, 1876

Viana, Renata Santos, Franco, Cleilton L., Ramos, Aiala Alana P., Mariano, Rodolfo, Silva De Azevêdo, Carlos A. & Stefanello, Fabiano, 2023, Pelocoris Stål, 1876 of northeastern Brazil (Hemiptera: Heteroptera: Naucoridae) first records and a key to the species, Zootaxa 5375 (2), pp. 193-213 : 203

Key to the species of the Pelocoris of northeastern Brazil

1. Male............................................................................................... 2

- Female............................................................................................. 7

2. Body length 14–18 mm ( Figs. 3C–D )...................................................... Pelocoris magister

- Body length less than 12 mm ........................................................................... 3

3. Hemelytra and scutellum with vermiculate pattern ( Figs. 2 , 5 , 6 )................................................ 4

- Hemelytra and scutellum with irregular markings or indistinct markings.......................................... 6

4. Posterolateral corner of abdominal segment III spinose ( Fig. 2 ), male abdominal tergum VII with posterior margin asymmetrical ( Fig. 7B ).......................................................................... Pelocoris bipunctulus

- Posterolateral corner of abdominal segment III at most acute ( Figs. 5 , 6 ), male abdominal tergum VII symmetrical........ 5

5. Posterolateral corner of abdominal segment IV spinose ( Fig. 5 ), male abdominal tergum VII with posterior margin straight ( Fig. 7E ), lateral margins of phallosoma with two distinct grooves ( Fig. 7K ), body length 8.0– 8.7 mm ......... Pelocoris politus

- Posterolateral corner of abdominal segment IV at most acute ( Fig. 6 ), male abdominal tergum VII with posterior margin concave medially ( Fig. 7F ), lateral margins of phallosoma straight without grooves ( Fig. 7L ), body length 11–14 mm .......................................................................................... Pelocoris subflavus

6. Phallosoma with lateral margins slightly converging to apex ( Fig. 7G )................. Pelocoris binotulatus nigriculus

- Phallosoma widened subapically on the right margin ( Fig. 7J )...................................... Pelocoris poeyi

7. Valvulae 1 profusely dentate along the dorsal and lateral margins, without distal setal tufts ( Figs. 11A, C, D )............. 8

- Valvulae 1 smooth along the dorsal and lateral margins, with distal setal tufts ( Figs. 11B, E, F )....................... 9

8. Subgenital plate subquadrate and concave medially ( Fig. 9C ), abdominal tergum VIII trapezoidal with distal portion with shallow median concavity ( Fig. 10C ), body length 14.5–18.0 mm................................ Pelocoris magister

- Subgenital plate trapezoidal with posterior margin shallowly concave medially ( Figs. 9A, D ), abdominal tergum VIII projected distally with posterior margin almost straight, body length 8.5–9.8 mm ....... Pelocoris binotulatus nigriculus and P. poeyi

9. Valvulae 2 dentate along the lateral margins ( Fig. 11E ), distal portion of metapleura narrowly rounded extending posteriorly ( Fig. 12C ), central lobe of abdominal tergum VIII narrowly rounded apically ( Fig. 10E )................ Pelocoris politus

- Valvulae 2 dentate only on the distal margin ( Figs. 11B, F ), distal portion of metapleura broadly rounded, only slightly projected ( Figs. 12A–B ); central lobe of abdominal tergum VIII broadly rounded ( Figs. 10B, F )............................. 10

10. Posterolateral corner of abdominal segment III spinose...................................... Pelocoris bipunctulus

- Posterolateral corner of abdominal segment III rounded....................................... Pelocoris subflavus

Figures

FIGURE 2. Dorsal and ventral habitus of Pelocoris bipunctulus. (A–B): male; (C–D) female. The arrow indicates the condition of posterolateral corner of abdominal segment III spinose Scale bar: 2 mm.

FIGURE 3. Dorsal and ventral habitus of Pelocoris magister. (A–B): male; (C–D) female. Scale bar: 2 mm.

FIGURE 5. Dorsal and ventral habitus of Pelocoris politus. (A–B): male; (C–D) female. Scale bar: 2 mm.

FIGURE 6. Dorsal and ventral habitus of Pelocoris subflavus. (A–B): male; (C–D) female. Scale bar: 2 mm.

FIGURE 7. (A–F): Male abdominal terga VI and VII.A, Pelocoris binotulatus nigriculus; B, P. bipunctulus; C, P. magister; D, P. poeyi; E, P. politus; F, P. subflavus. (G–L): Male genital capsule and phallosoma. G, Pelocoris binotulatus nigriculus; H, P. bipunctulus; I, P. magister; J, P. poeyi; K, P. politus; L, P. subflavus.

FIGURE 9. Female subgenital plate, ventral view. A, Pelocoris binotulatus nigriculus; B, P. bipunctulus; C, P. magister; D, P. poeyi; E, P. politus; F, P. subflavus. Arrows indicate the median concavity of the posterior margin.

FIGURE 10. Female abdominal tergum VIII, dorsal view.A, Pelocoris binotulatus nigriculus; B, P. bipunctulus; C, P. magister; D, P. poeyi; E, P. politus; F, P. subflavus. Arrows indicate different conditions of the posterior margin.

FIGURE 11. Female valvulae 1 and valvulae 2, dorsal view. A, Pelocoris binotulatus nigriculus; B, P. bipunctulus; C, P. magister; D, P. poeyi; E, P. politus; F, P. subflavus. Arrows indicate different conditions in the valvulae.

FIGURE 12. Right side of symmetric pterothorax, ventral view. A, P. bipunctulus; B, P. poeyi; C, P. politus. Arrows indicate the posterior margins of the metapleura.