Chimerocoris luridus, BARROs & Barão & Grazia, 2020

BARROs, Lurdiana D., Barão, Kim R. & Grazia, Jocélia, 2020, Systematics of the Mecocephala group (Hemiptera: Heteroptera: Pentatomidae) based on a phylogenetic perspective: Inclusion of Hypanthracos, description of three new genera, and redescription of Ogmocoris, Arthropod Systematics & Phylogeny 78 (2), pp. 321-360 : 335-336

Chimerocoris luridus sp.n.

Figs. 6 A– C, 7 A– F, 17 , 18 Fii, I, 19 A, D, F, H, J – L

Diagnosis. Each antennomere 3 cylindrical, shorter than 5 and antennomeres 4 conical, convex dorsally. Bucculae truncate, reaching base of head. Labium long, surpassing the middle of abdominal sternite 6. Anterolateral margins of pronotum not reflexed. Basal angles of scutellum with foveae subequal to the diameter of a compound eye. Seg-ment X ogival, with a transverse carina and 1 + 1 thorn-like processes at base.

Description. Measurements: Table 4. Colouration: General colour yellowish-brown dorsally and ventrally, densely punctate ( Fig. 6A, B ). Head with calloused, yellow longitudinal stripes on clypeus medially; anten-nomeres uniformly brownish ( Fig. 6A ); antenniferous tubercles and maxillary plates brown. Outline of ante-rolateral margins of pronotum yellowish. Femora, tibiae and tarsi yellowish ( Figs. 6A ; 19D ). Connexivum yel-low, each connexivum with blotchy spot brown in the posterolateral angles ( Fig. 6A ). Sternites brown with darkened punctures; antero- and posterolateral angles of sternites dark brown ( Fig. 6B ). Sternites 3 – 7 yellow sublaterally, with concolourous trichobothria and punc-tures ( Fig. 6C ). Spiracles dark brown. Head: Anteocular processes present. Proportions of antennomeres: 1 <2> 3 <4 <5. Posterior margins of bucculae reaching base of head. Labiomere 2 shorter than labiomeres 3 and 4 com-bined ( Fig. 6C ). Thorax: Anterior angles of pronotum not produced; anterolateral margins of pronotum straight and smooth; humeral angles not produced ( Fig. 19D ). Periostiolar depressions of ESES present; each peritreme extending about ⅔ of the distance to lateral margin of evaporatorium; gyrification of evaporatorium with high wrinkles; anterolateral margin of each evaporatorium rounded; outer margin of each metapleural evapora-torium concave ( Fig. 18I ). Corium surpassing apices of abdominal tergite 5. Membrane with veins linear. Hemelytra not surpassing apex of abdomen ( Fig. 6A ). Abdomen: Posterolateral angles of each connexivum not produced. Male terminalia: Pygophore subrectangular ( Figs. 7A – F ; 19J – L ); posterolateral angles rounded. Genital cup occupying more than half the length of py-gophore; dorsal rim medially entire; extension of dor-sal rim over segment X obsolete; area between layers of ventral rim depressed, striated; superior layer of ventral rim U-shaped medially, with two pairs of processes ( Fig. 7C ). Inferior layer of ventral rim with 1 + 1 pro-cesses ( Fig. 7F ). Segment X ogival. Crown of parameres trapezoidal ( Fig. 7D ).

Female. Unknown.

Etymology. Luridus, in Latin, yellow, referring to the colour of legs and connexiva; adjective.

Type material: Holotype ♂, ‘ BRAZIL, Rio Grande do Sul, [São Francisco de Paula], Pro-Mata | Projeto Sitel/ Corsan | 5.xii.1997 | C Weirauch leg.’ ( MCTP) <illus-trated specimen>.

Distribution. Brazil: Rio Grande do Sul ( Fig. 17 ).

Figures

Fig. 6. Chimerocoris luridus sp.n. ♂: A: dorsal; B: ventral; C: lateral. Scale bars = 2.0 mm.

Fig. 7. Chimerocoris luridus sp.n. ♂: Male terminalia: A– D: dorsal; B–E: posterior; C–F: ventral. Scale bars = 1.0 mm.

Fig. 17. Map of geographical distribution. — Colors: yellow – Chimerocoris luridus sp.n.; purple – Hypanthracos meridionalis; red – Liscocephala fumosa sp.n.; green – Ogmocoris Mayr, 1864; blue – Triunfus gen. n.

← Fig. 18. Representation and comparison of head and thoracic characters. A–C: head, dorsal view; D–E: head and prothorax, lateral view (antennomeres not showing due to edition of photo); F: schematic drawing showing the antennomeres; G–S: external scent efferent system; G–N: meso- and metapleura, ventral view; G: schematic drawing showing the parts of eses; O–S: SEM images of characters of eses of mestasternal glands. — (A, Fi, H): Hypanthracos meridionalis; (B, N): Mecocephala magna; (C): Paramecocephala foveata; (D, M): Tibraca limbativentris; (E, S): Hypatropis inermis; (Fii, I): Chimerocoris luridus; (Fiii, J): Ogmocoris hypomelas; (Fiv, K): Liscocephala fumosa; (Fv, L): Triunfus carvalhoi; (O): Glyphepomis adroguensis; (P): Paramecocephala fusca; (Q): Pedinonotus catarinensis; (R): Glyphepomis setigera; Scale bars: A–E, H–N = 0.5 mm; O–S = 100 μm.

Fig. 19. Comparative figure of Chimerocoris, Paramecocephala and Tibraca. A–C: habitus dorsal (antennomeres and legs not showing due to edition of photo); D–E: head and pronotum; F–G: habitus ventral; H–I: habitus lateral; J–R: male terminalia: J, M, P: dorsal view; K, N, Q: posterior view; L, O, R: ventral view. — (A, D, F, H, J–L): Chimerocoris luridus; (B, I, M–O): Paramecocephala fusca; (C, E, G, P–R): Tibraca exigua. Scale bars:A– C, F– I = 2.0 mm; D–E = 0.5 mm; J–R = 1.0 mm.