Chimerocoris, 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 : 334-335

Chimerocoris gen.n.

Type species. Chimerocoris luridus sp.n., here desig-nated.

Diagnosis. Head longer than wider; labium long; sur-passing the middle of abdominal sternite 6; labiomere 2 flattened laterally. Anterolateral margins of pronotum not reflexed. Basal angles of scutellum with foveae subequal to the diameter of a compound eye. Layers of ventral rim of pygophore separated by a carina; parameres reduced, with obsolete crown; segment Xwith a transverse carina and 1 + 1 thorn-like processes at base.

Description. Body ovate. Head: Head longer than wide, apex rounded ( Figs. 6A ; 19D ). Mandibular plates shorter than clypeus, obtuse at apices; lateral margins of mandib-ular plates sinuous. Clypeal apex obtuse, in a higher level than mandibular plates in lateral view; clypeal suture be-ginning after an imaginary line crossing anterior margin of compound eyes; antenniferous tubercles visible in dorsal view, each with an obtuse process laterally. Anten-nomere 1 not reaching apex of head; antennomere 2 vis-ible; antennomere 3 cylindrical; antennomere 4 conical, convex dorsally ( Fig. 18 Fii). Bucculae sinuous, truncate posteriorly. Labium long, surpassing middle of sternite 6; first labiomere lying entirely between the bucculae; la-biomere 2 flattened laterally and labiomeres 3 and 4 uni-formly entire. Thorax: Pronotum trapezoidal ( Fig. 19D ); anterolateral margins explanate, not reflexed, impunc-tate; posterior margin slightly convex. Mesosternal ca-rina elevated, smooth; metasternal furrow shallow. Each of ostiole of ESES guttiform, opening posterolaterally; each peritreme spout-shaped; medial furrow of the each ostiolar peritreme long, occupying more than of length of peritreme; evaporatorium punctate, each occupying more than half of meso- and metapleuron; evaporatorium on mesopleuron reaching its anterior and posterior lateral angles, and surpassing the limits of mesocoxal sutures ( Fig. 18I ). Metathoracic spiracle wide. Length of femora and tibiae subequal; femora unarmed; tarsi 3-segmented. Scutellum longer than wide ( Fig. 6A ). Basal angles of the scutellum foveate; foveae subequal to diameter of a compound eye. Corium longer than scutellum, surpass-ing apices abdominal tergite 5 and apex of each radial vein conspicuously calloused. Abdomen: Connexivum exposed ( Fig. 6A ). Sublateral margins of abdominal sternites not concolourous with abdominal venter ( Figs. 6C , 19H ). Medial longitudinal groove reaching sternite 6 ( Fig. 6B ). Male terminalia: Genital cup of pygophore broad, open posterodorsally; ventral rim composed of two layers, the inferior and superior layers, separated by a carina ( Figs. 6E , 19J – L ). Superior layer of ventral rim, projecting toward genital cup, developed laterally to seg-ment X, not covering parameres; lateral margin of each projection of superior layer notched. Segment Xcarinate and with 1 + 1 thorn-like processes at base. Parameres reduced, with obsolete crown.

Etymology. From Greek Chimero - mythological figure characterized by a hybrid appearance referring to the combination of characters of two genera ( Tibraca and Paramecocephala ); and - coris, stink bug; masculine.

Comments. Chimerocoris has the habitus and length of labium similar to Paramecocephala , and the morphol-ogy of pygophore similar to Tibraca . The comparison of these genera is presented in Figure 19 .

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. 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.

← 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. 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.