Acanthocephala carioca, Olivera & Dellapé & Melo, 2024

Olivera, Leonela, Dellapé, Pablo M. & Melo, María Cecilia, 2024, Description of eight new species of the genus Acanthocephala Laporte, 1833 from South America (Hemiptera, Coreidae, Acanthocephalinae), Zoosystema 46 (12), pp. 285-318 : 294-296

Acanthocephala carioca n. sp.

( Figs 8-10 ; 30 )

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TYPE MATERIAL. — Holotype. Brazil • “ ♂ Rio de / Jan. [green label] [ MACN]”.

TYPE LOCALITY. — Brazil, Río de Janeiro.

ETYMOLOGY. — The specific epithet carioca, a name in apposition, is the demonym for the people from the city of Rio the Janeiro, in the homonym Brazilian state, where the holotype was collected.

DISTRIBUTION. — Only known from Brazil ( Fig. 30 ).

DESCRIPTION OF HOLOTYPE ( Fig. 8A, B )

General

General color reddish brown. Total length 27.50, length of head 2.82.

Head ( Fig. 8C, D )

With sparse semierect yellowish setae; dorsal surface dark brown with a median longitudinal fringe paler, with two yellowish elongate spots next to outer margin of ocelli, inner region of antennal tubercles and buccula yellowish. Neck and gula paler than dorsal region of head. Dorsal margin of tylus straight, apex not projected upwards, reaching dorsal margin of head. Post-tylus depression deep, two times shorter than interocellar space. Length of tylus 1.152, length of post-tylus depression 0.35. Eyes globose and protuberant, large in relation to the size of the head. Width of eye 0.90, ocular distance 3.14, synthlipsis 1.38, ocellar distance 1.15, interocellar space 0.70. Buccula small and subtriangular, reaching the anterior third of eye. Antennae: Scape with inner side longitudinally ridged; with abundant decumbent yellowish setae and semierect darker stiff setae [pedicel, basi- and distiflagellomeres absent]. Length of antennal articles: scape 6.75; width of antennal articles: scape 0.50. Labium brown, dorsal region of segments I-II and apex of segment IV darker, extending to mesocoxae. Length of labial segments: I 2.39, II 2.11, III 2.02, IV 1.74. Thorax

Pronotum: reddish brown ( Fig. 8E ), with sparse semierect and decumbent yellowish setae all over the surface, more abundant on anterior lobe; anterior lobe smooth unarmed, calli with two small rounded tubercles between them; posterior lobe punctate with short rounded smooth and shiny tubercles that turns irregular on posterior region; anterolateral margins straight slightly crenulated; humeral angles expanded, not elevated over pronotal surface, tuberculated, ending in a subacute spine slightly directed backwards; humeral distance 1.2 times longer than width of abdomen; posterolateral margins tuberculated, triangular processes short.Width of humeral angles 12.00. Scutellum: reddish brown, longer than wide, with conspicuous transversal rugosities, and sparse decumbent yellowish short setae; base elevated forming a transversal bridge; apex yellowish and incrassate. Length of scutellum 4.00, width 3.75. Thoracic pleurae: brown, with sparse semierect yellowish setae; anterior lobe of auricle black and elongate, posterior lobe elongate; evaporatory area with conspicuous rugosities ( Fig. 9A ), supracoxal area of metapleura incrassate posteriorly. Thoracic sterna: brown, with abundant long erect yellowish setae; mesosternal anterior projection paler.

Hemelytra. Clavus and corium reddish brown, with punctures along and next to veins and in the center of the cells, with short decumbent yellowish setae on punctures, veins concolorous; costal margin yellowish and smooth; membrane dark brown and glabrous, veins paler. Length of hemelytra 23.12.

Legs. Pro- and mesotrochanters unarmed, metatrochanters with two small ventral dark brown setiferous tubercles. Femora with decumbent yellowish setae and darker and stiff setae all over the surface, erect setae ventrally. Pro- and mesofemora brown; anterior, posterior, and dorsal margins unarmed; ventral rows of spines ending in a small apical spine. Metafemur reddish brown, 3.6 times wider than profemur ( Fig. 9B ); dorsal margin with two rows of conical setiferous tubercles with the apex darker; posterior row with a large basal tubercle; ventral margin black with two rows of spines, anterior row with narrow and slightly compressed black spines becoming larger to the middle and ending on a bidentate apical projection; posterior row with dark conical tubercles becoming larger to the apex and ending on an apical bidentate projection; anterior margin unarmed; posterior margin with a row of conical setiferous tubercles, basal tubercle larger with sparse small tubercles ventrally. Pro- and mesotibiae brown, unarmed. Metatibia ( Fig. 9C ) reddish brown with abundant short decumbent golden setae; dorsal expansion unarmed, gradually enlarging on basal third, maximum width at distal third, from where it slightly narrows and runs parallel to the tibia, then it slightly enlarged apically ending rounded and in a straight angle; ventral margin black, barely expanded on basal third, with two rows of irregular black conical setiferous tubercles becoming larger to the apex and cross at distal third forming only one row. Pro- and mesotarsi pale brown, metatarsus yellowish. Width of profemur 0.85; length of metafemur 16.25, width 3.13; length of metatibia 18.62, width 4.12.

Abdomen

Length of abdomen 15.62, width 9.25. Terga black. Sterna brown irregularly pigmented, with short decumbent yellowish setae and sparse semierect setae. Abdominal sternite III expanded forming a subtriangular fold ( Fig. 9D ). Area of insertion of trichobothria and surrounding area yellowish, detached in sternites III and IV, and forming one macula on the rest of the segments. Lateral areas with punctures and rugosities around spiracles. Spiracles black, surrounding area yellowish.

Male genitalia ( Fig. 10 ). pygophore ( Fig.10A, B ): dorsal opening broadly rounded, parandria not developed; dorsal margin straight (in lateral view), abruptly declivent at the distal third forming a rounded projection. Parameres ( Fig. 10C ): basal shank wide, inner margin convex and not expanded, outer margin oblique slightly concave distally; arm elongate, ending in a small curved tooth. Aedeagus as seen in Figure 10D , conjunctival dorsal appendices I lobate apically, with a small median depression between each other.

FEMALE

Unknown.

Figures

FIG. 8. — Acanthocephala carioca n. sp., male holotype: A, dorsal view; B, ventral view; C, head, dorsal view; D, head, lateral view; E, pronotum. Scale bars: A, B, 10 mm; C, D,1 mm; E, 5 mm.

FIG. 9. — Acanthocephala carioca n. sp.: A, metathoracic gland and evaporatory area;B, male metafemur;C, male metatibia;D, lateral expansions on abdominal sternite III. Abbreviations: see Material and methods. Scale bars: A, 0.5 mm; B, C, 5 mm; D, 1 mm.

FIG. 10. — Acanthocephala carioca n. sp., male genitalia: A, pygophore lateral; B, pygophore dorsal; C, right paramere,lateral views;D, aedeagus. Abbreviations: see Material and methods. Scale bars: A, B, 1 mm; C, D, 0.5 mm.

FIG. 30. — Distributional map of the new species of the genus Acanthocephala Laporte, 1833 described in the present work.