Liscocephala, 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 : 343

Liscocephala gen.n.

Type species. Liscocephala fumosa sp.n., here desig- nated.

Diagnosis. Antennomere 2 much reduced, less than 1/4 of the length of antennomere 1, hardly visible and an- tennomere 3 conical, flattened dorsally, longer than an- tennomere 5. Posterior margin of pronotum rectilinear. Scutellum longer than wide, post-frenal width of scutel- lum more than the basal width of the scutellum. Foveae smaller than the diameter of a compound eye. Coria longer than scutellum, not surpassing apices of abdomi- nal tergite 5. Metathoracic spiracle narrow. Valvifers 8 flat.

Description. Body oval, small (total length: 8.55 mm) ( Fig. 13 A– B). Head: Head longer than wide, apex rounded ( Figs. 13A , 20C ). Mandibular plates shorter than clypeus, apices obtuse; lateral margins sinuous. Clypeal apex obtuse, in a higher level than mandibular plates in lateral view; clypeal suture beginning after an imaginary line crossing anterior margin of compound eyes. Anten- niferous tubercles visible in dorsal view, each with an ob- tuse process laterally. Antennomere 1 not reaching apex of head; antennomere 2 much reduced, less than 1/4 the length of the first antennomere, hardly visible; antenno- mere 3 conical, flattened dorsally; antennomere 4 coni- cal, slightly flattened dorsally ( Figs. 13D , 18 Fiv, 20G). Bucculae sinuous, tapering toward the base of head. First labiomere robust, lying entirely between bucculae, la- biomere 2 flattened laterally ( Figs. 13D , 20E ). Thorax: Pronotum trapezoidal ( Figs. 13A , 20I ); anterolateral margins explanate, not reflexed, impunctate; posterior margin rectilinear. Mesosternal carina elevated, smooth ( Fig. 13E ); metasternal furrow shallow. Each ostiole of ESES guttiform, opening posterolaterally; each peri- trema spout-shaped; medial furrow of the each ostiolar peritreme relatively long, extending more than half of the length of peritreme; evaporatorium punctate, occu- pying more than half of each meso- and metapleuron; evaporatorium on mesopleuron reaching its anterior and posterior angles, surpassing the limits of mesocoxal su- tures ( Fig. 18K ). Metathoracic spiracle narrow ( Fig. 18K , red arrow). Femora longer than tibiae; unarmed femora; tarsi 3-segmented ( Fig. 13C ). Scutellum longer than wide ( Figs. 13A ). Basal angles of scutellum foveate; fovea rel- atively smaller than the diameter of a compound eye ( Fig. 20K , red arrow). Corium longer than scutellum, extend- ing beyond apex of scutellum; apex of each radial vein punctate (inconspicuous callosity, Fig. 20K ). Abdomen: Connexivum exposed ( Fig. 13A ). Sublateral margins of abdominal sternites not concolourous with abdominal venter (lighter than abdominal venter, Fig. 13C ). Medial longitudinal groove reaching abdominal sternite 6 ( Fig. 13F , red arrow). Female terminalia ( Figs. 13F , 16A, C ): Valvifers 8 flat. Valvulae 8 not visible. Valvifers 9 lev- eled, relative to the position of Xsegment Xin lateral view. Laterotergites 9 not surpassing tergite 8.

Etymology. Lis­, given in honour of Lis de Barros Borg- es, L. D. Barros’s daughter; “- cocephala ”, relative to the Mecocephala group; feminine.

Distribution. Uruguay: Canelones ( Fig. 17 ).

Figures

Fig. 13. Liscocephala fumosa sp.n. ♀: A: dorsal; B: ventral; C: lateral; D: head and pronotum, lateral view, antennomere 3 grooved (red arrow); E: pro- and mesosternum, ventral view, showing the carina mesosternal (red arrow); F: abdomen, lateral view, showing the ab- dominal groove (red arrow). Scale bars:A–C, F = 2.0 mm; D –E = 0.5 mm.

Fig. 20. Comparative figure of Liscocephala and Triunfus. A–B: habitus dorsal (antennomeres and legs not showing due to edition of photo); C –D: head and pronotum, dorsal view; E–F: head and prothorax, lateral view; G–H: right antenna; I–J: pronotum, dorsal view; K–L: hemelytra. — (A, C, E, G, I, K): Liscocephala fumosa; (B, D, F, H, J, L): Triunfus carvalhoi. Scale bars: A–C, K–L = 2.0 mm; C–F, I–J = 1.0 mm; G–H = 0.5 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. 16. Liscocephala gen.n. and Triunfus gen.n. ♀: L. fumosa: A, C: female terminalia. T. carvalhoi: B, D: female terminalia; E, F: female receptaculum seminis and ausenwand. T. incarnatus: G: female receptaculum seminis and ausenwand. Scale bars = 0.5 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.