Liscocephala fumosa, 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 : 343-345

Liscocephala fumosa sp.n.

Figs. 13 A– F, 16A, C, 17, 18Fiv, K, 20A, C, E, G, I, K

Diagnosis. Body oval. Head wider than longer. Anten- nomere 1 robust compared to the other antennomeres; antennomere 2 less than 1/4 of the first, hardly visible; antennomere 3 conical, flattened dorsally, longer than an- tennomere 5. Labiomere 1 robust. Anteriormargin of pro- notum strongly concave; posterior margin of pronotum rectilinear. Scutellum longer than wide. Foveae smaller than the diameter of a compound eye. Coria longer than scutellum, not surpassing apices of abdominal tergite 5. Valvifers 9 depressed. Laterotergites 9 not surpassing ter- gite 8.

Description. Body small (total length: 8.55 mm). Measurements: Table 4. Colouration: General coloration brownish gray dorsally, dark brown ventrally, densely punctate with large punctures. Head and clypeus with dark brown callosities. Ocelli red. Antennomeres uni- formly brownish. Antenniferous tubercles and maxillary plates dark brown. A longitudinal line on pronotum, an- terolateral margins of pronotum and lateral margins of coria pale yellow. Scutellum with impunctate brownish callosities, laterally foveate ( Fig. 13A ). Pro-, meso- and metasternum uniformly dark brown. Coxae, trochanters and basal ⅔ of femora pale yellow, apices of femora, tibiae and tarsi brown. Connexivum and tergite 8 pale yellow and brownish and anterolateral and posterolateral angles of connexivum. Sternites dark brown, sublateral band from prosternum to abdominal sternite 7 and later- otergites 8 pale yellow; anterolateral angles of sternites dark brown. Spiracles dark brown to black. Trichobothria dark brown ( Figs. 13C, F ). Head ( Figs. 13A, D , 20C, E, G ): Anteocular processes absent. Proportions of anten- nomeres: 1> 2 <3> 4 <5 ( Figs. 13D , 18 Fiv, 20G). Buc- culae reaching base of head. Thorax: Pronotum with an- terior angles not produced; anterolateral margins straight, smooth; humeral angles not produced ( Figs. 13A , 20I ) and posterior margin rectilinear. Periostiolar depressions of ESES present; each ostiolar peritreme occupying about 1/3 of evaporatorium; gyrification of evaporatorium with high wrinkles; outer margin of each metapleural evapo- ratorium concave; anterolateral margin of each evapora- torium rounded ( Fig. 18K ). Metathoracic spiracle narrow ( Fig. 18K , red arrow). Foveae smaller than the diameter of a compound eye ( Fig. 20K , red arrow). Corium not surpassing apices of abdominal tergite 5 ( Figs. 13A , 20K , blue arrow). Membrane with linear veins, some bifurcate basally. Hemelytra not surpassing apex of abdomen. Abdomen ( Figs. 13B – C , 20K ): Posterolateral angles of each connexivum not produced. Sublateral margins of abdominal sternites pale yellow. Female terminalia ( Figs. 13F , 16A, C ): Valvifers 8 smaller than lateroter- gites 9, and partially covering valvifers 9, and posterior margins sinuous, mesial margins juxtaposed. Lateroter- gites 8 lacking spiracles; posterior margins straight. Valvifers 9 depressed, leveled, relative to the position of segment X; posterior margins rectilinear, lateral margins with 1 + 1 processes. Laterotergites 9 spatulate, obtusely rounded apically, not surpassing tergite 8.

Male. Unknown.

Etymology. The specific epithet refers to the brownish gray colour of the dorsal surface.

Type material: Holotype ♀, ‘ URUGUAY, Canelones, [ Atlantida ] | 28.ii.1932 ’ | ‘ MNHN-1344 ’( URMU) <illustrated specimen> .

Distribution. Uruguay: Canelones ( Fig. 17 ).

Comments. Labium lacking part of labiomere 2 and re- maining labiomeres in single specimen. However, we be- lieve that the labium is long, at least exceeding the mid- dle of the abdominal sternite 4, due to the presence of a medial longitudinal groove reaching abdominal sternite 6 ( Fig. 13D, F ). This groove is observed only in species where the labium is considered long.

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.