Acanthocephala angusta, 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 : 287-291

Acanthocephala angusta n. sp.

( Figs 1-4 ; 30 )

urn:lsid:zoobank.org:act:76305C6F-9B65-4B6D-9DB1-5529F7A6AF22

TYPE MATERIAL. — Holotype. Colombia • “ ♂ Bolívar, Isla / Fuerte , 09,3833°N / 76.1833°W, 10 m, Feb-Abr / 2014, I. Hidalgo // MPUJ-10006 [yellow label] // ME395 [yellow label] [ PUJ]” ( Figs 1A , C-E; 2A, B, D, F, G).

Paratype. [ Colombia] • “ ♀ Sasaima / 5-XII-[19]72 // MPUJ-HEM0492 // MUJ1.654 [ PUJ]” ( Figs 1B ; 2C, E ; 4 A-C) .

TYPE LOCALITY. — Colombia, Bolivar, Isla Fuerte.

ETYMOLOGY. — From the Latin angustus, meaning narrow and referring to the slightly developed expansions of the metatibiae in males and females.

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

DESCRIPTION OF HOLOTYPE ( FIG. 1A )

General

General color brown to dark brown. Total length 22.50; length of head 2.49.

Head ( Fig. 1C, D )

With sparse semierect yellowish setae; vertex brown with two paler areas next to ocelli and on the inner margin of antenniferous tubercles. Dorsal margin of tylus straight, reaching dorsal margin of head, apex not projected upwards. Post-tylus depression shallow, 3.6 times shorter than interocellar space. Length of tylus 0.99, length of post-tylus depression 0.24. Eyes globose and protuberant, small in relation to the size of the head. Width of eye 0.67, ocular distance 2.59, synthlipsis 1.44, ocellar distance 1.12, interocellar space 0.86. Buccula subrectangular, reaching the anterior third of eye. Antenna shorter than body length. Scape, pedicel and basiflagellomere reddish brown with abundant short decumbent yellowish setae, and long semierect stiff setae; distiflagellomere light brown with abundant long decumbent yellowish setae, and sparse semierect setae. Length of antennal articles: scape 4.00, pedicel 3.37, basiflagellomere 2.75, distiflagellomere 6.00; width of antennal articles: scape 0.37, pedicel 0.23, basiflagellomere 0.23, distiflagellomere 0.28. Labium brown, apex of segment IV black; extending to mesocoxae. Length of labial segments: I 2.16, II 2.02, III 1.27, IV 1.64.

Thorax

Pronotum ( Fig. 1E ): with short decumbent yellowish setae, and long erect stiff setae all over the surface, setae more abundant on anterior lobe; anterior lobe and calli smooth; posterior lobe punctate with small sparse rounded tubercles; anterolateral margins straight, with small conical smooth and shiny tubercles; humeral angles unarmed, widened but not elevated, ending in a lateral wide and blunt protuberance; humeral distance slightly larger than width of abdomen; posterolateral margins weakly tuberculated basally; triangular processes short. Width of humeral angles 9.00. Scutellum: as long as wide, punctate with transversal rugosities, and abundant short decumbent yellowish setae and stiff darker erect setae all over the surface; base elevated, apex incrassate and yellowish. Length of scutellum 3.12; width of scutellum 3.12. Thoracic pleurae: brown, with abundant decumbent yellowish setae; proepimeron with sparse rounded tubercles; metathoracic gland auricle and evaporatory area pale brown with conspicuous rugosities, anterior lobe of auricle rounded, posterior lobe elongate ( Fig. 2A ); supracoxal area of metapleura incrassate posteriorly. Thoracic sterna: brown, with abundant long erect yellowish setae; mesosternal anterior projection concolorous.

Hemelytra. Clavus and corium brown, entirely punctate, with abundant yellowish decumbent setae, costal margin smooth; membrane brown with sparse decumbent yellowish setae, veins concolorous. Length of hemelytra 17.50.

Legs. Protrochanter with a ventral small black setiferous tubercle, meso- and metatrochanters with two black setiferous tubercles ventrally (larger on metatrochanter).Femora with long decumbent yellowish setae, and darker stiff semierect setae becoming erect on ventral margin. Pro- and mesofemora brown paler basally; anterior, dorsal, and posterior margins unarmed; rows of spines on ventral margin ending in a small apical spine, except on posterior row of profemur that ending in a larger spine. Metafemur brown, at least 3.3 times wider than profemur ( Fig. 2B ); dorsal margin with two rows of conical setiferous tubercles with their apex black; posterior row with a larger basal tubercle; ventral margin with two rows of spines and tubercles: anterior row with conical spines becoming larger toward the middle and ending in a flat dentate projection, median spine larger; posterior row with rounded tubercles becoming larger toward the apex and ending in a flat dentate projection; anterior and posterior margins with irregular rounded tubercles. Metatibia ( Fig. 2D ) brown, dorsal expansion fusiform, maximum width at basal third, sinuously narrowing to the apex, ending in an acute angle; distal third armed with small setiferous tubercles; ventral margin slightly expanded, evident on basal third; margin bordered with two rows of conical irregular setiferous tubercles becoming larger to the apex and crossing on distal third forming only one row; anterior and posterior margins unarmed.Tarsi brown. Width of profemur 0.94; length of metafemur 10.25, width 3.12; length of metatibia 10.25, width 1.50.

Abdomen

Length of abdomen 11.37, width 6.87. Terga black, with a rounded yellowish macula around scent glands openings, posterior macula continuing into a longitudinal fringe along tergite VI to anterior region of tergite VII ( Fig. 2G ); posterior angles of lateral margins of segments III-VII paler. Sterna brown, with abundant decumbent yellowish setae and sparse semierect setae. Abdominal sternite III expanded along all segments, sternite IV expanded only on the anterior half ( Fig. 2F ). Area of insertion of trichobothria yellowish, surrounding area concolorous with rest of abdomen; lateral areas with rugosities around spiracles. Spiracles black.

Male genitalia ( Fig. 3 ). Pygophore ( Fig. 3A, B ): dorsal aperture broadly rounded with parandria evident, directed backwards; dorsal margin straight and slightly declivent distally in lateral view. Parameres ( Fig. 3C ): Dorsal region of basal shank rounded, narrowing on distal third at the joint with the arm, inner margin straight and not expanded, outer margin straight; arm elongate and narrow, shorter than basal shank. Aedeagus as seen in Figure 3D , conjunctival dorsal appendices I subtriangular, apex of outer margin rounded, with a small median depression in between.

DESCRIPTION OF PARATYPE FEMALE ( FIG. 1B )

Thorax

Supracoxal area of metapleura not incrassate posteriorly.

Legs. Anterior row of spines on antero-ventral margin of the left mesofemur with an apical smaller spine. Pro- and mesotrochanters unarmed, metatrochanter with only one minute setiferous tubercle ventrally. Metafemur 1.4 times wider than profemur ( Fig. 2C ); dorsal margin with two rows of conical setiferous tubercles with their apex dark; anterior and posterior margins with one row of small conical tubercles on distal third. Metatibia ( Fig. 2E ) with dorsal expansion unarmed, wider to the apex at basal third, then abruptly narrowing to the apex and ending in an acute angle. Ventral expansion of metatibiae restricted to basal third; margin bordered by two rows of conical setiferous tubercles that cross on distal third forming only one row, and do not reach the apex.

Abdomen

Expansion of lateral margin of sternite III and IV not developed.

Female genitalia ( Fig. 4 ). Sternite VII ( Fig. 4A ): fisura long, median lobes well-developed, quadrangular, and overlapping with each other; plica convex, close to anterior margin of sternite, as long as the maximum width of first gonocoxae; posterolateral margins extending to the apical third of first gonocoxae. Paratergite VIII overpassing first gonocoxae ( Fig. 4A ). Dorsal apodeme of first gonocoxae long, wide, and rectangular ( Fig. 4B ). Second gonocoxae wide, with a well-developed lateral apodeme at middle third, basal region wider than apical region ( Fig. 4C ). Second gonapophysis as long as second gonocoxa. Spermatheca ( Fig. 4D ): seminal receptacle apically globose and subtriangular; flexible zone long; distal duct as long as flexible zone; dilation of the spermathecal duct elongate.

PARATYPE MEASUREMENTS (N = 1 ♀)

Total length 21.25; length of head 2.35; length of tylus 0.94; length of post-tylus depression 0.24; width of eye 0.65; ocular distance 2.40; synthlipsis 1.28; ocellar distance 0.99; interocellar space 0.74; length of antennal articles: scape 3.87; rest of articles absent.; width of antennal articles: scape 0.38; length of labial segments: I 2.02; II 1.93; III 1.41; IV 1.55; width of humeral angles 8.12; length of scutellum 2.62, width 2.62; length of hemelytra 15.87; width of profemur 0.94; length of metafemur 8.62, width 1.37; length of metatibia 8.75, width 1.62; length of abdomen 11.37, width 6.87.

Figures

FIG. 1. — Acanthocephala angusta n. sp.: A, male holotype, dorsal view;B, female paratype,dorsal view;C, head,dorsal view;D, head, lateral view;E, pronotum. Scale bars: A, B, 10 mm; C, D, 1 mm; E, 2 mm.

FIG. 2. — Acanthocephala angusta n. sp.: A, metathoracic gland and evaporatory area; B, male metafemur; C, female metafemur; D, male metatibia; E, female metatibia; F, lateral expansions on abdominal sternite III, lateral view; G, Abdominal tergites in dorsal view. Abbreviations:see Material and methods. Scale bars: A, 0.5 mm; B-G, 5 mm.

FIG. 3. — Acanthocephala angusta 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, D, 1 mm; C, 0.5 mm.

FIG. 4.— Acanthocephala angusta n. sp., female genitalia: A, pregenital and genital segments; B, first gonocoxa and gonapophysis; C, second gonocoxa and gonapophysis; D, spermatheca. Abbreviations: see Material and methods. Scale bars: A, 2 mm; 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.