Yangambia, SCHOUTEDEN, 1942

Namyatova, Anna A. & Cassis, Gerasimos, 2016, Systematic revision and phylogeny of the plant bug tribe Monaloniini (Insecta: Heteroptera: Miridae: Bryocorinae) of the world, Zoological Journal of the Linnean Society 176 (1), pp. 36-136 : 130-131

YANGAMBIA SCHOUTEDEN

Figures 8, 10I, 11I, 17 AH–AK, 21C, D, 24

Yangambia Schouteden, 1942b: 5 (gen. nov.; type species Yangambia vesiculata by monotypy); Schouteden, 1945: 116 (syn.); Carvalho, 1952: 60 (cat.); Carvalho, 1955: 41 (key to gen.); Carvalho, 1957:150 (cat.); Odhiambo, 1962: 307 (disc.); Villiers, 1952: 189 (descr.); Schuh, 1995: 533 (cat.); Schuh, 2002 –2013 (cat.); Namyatova et al., in press (phylogeny).

Idioaspis China, 1944: 186 (gen. nov.; type species Idioaspis macarangae by monotypy, syn. by Schouteden, 1945: 116); China, 1944: 174 (key to gen.); Carvalho, 1952: 60 (cat.); ( Carvalho, 1957: 150 (cat.); Schuh, 1995: 533 (cat.); Schuh, 2002 –2013 (cat.).

Diagnosis: Yangambia belongs to the Odoniella - complex (see discussion after tribe) and it can be distinguished from other genera of this group by: scutellum divided into six parts dorsally ( Fig. 11I), scutellum impunctate ( Fig. 11I), humeral angles of pronotum distinctly flattened and serrate ( Fig. 10I); flattened dark setae on hemelytra in parches, and spermathecal gland on DLP placed medially near posterior margin ( Fig. 21C).

Redescription: Male: Body length 4–5 mm. COLORA- TION ( Fig. 8). Mostly whitish yellow to yellow, sometimes with pale brown to brown markings. TEXTURE. Head with two pairs of tubercles between eyes; flattened areas on vertex indistinct; antenna and tibiae with tubercles at base of setae; pronotum with punctures mixed with wrinkles, with four large tubercles on collar and 10 large tubercles on posterior part of pronotum ( Fig. 10I); scutellum without tubercles and punctures, with shallow wrinkles ( Fig. 11I); pair of punctures between mesoscutum and scutellum, pair of punctures between mesoscutum and scutellum, punctures on clavus and on R + M absent; striations on lateral margins of scutellum present only anteriorly; semicircular depression between scutellum and mesoscutum absent. VESTITURE. Body clothed with setae, shorter than with of hind tibia; head with rarely distributed simple or flattened pale setae, dorsal side of head without setae; antenna with mixture of pale adpressed and spine-like suberect setae; setae on pronotum and scutellum absent; thoracic pleura with rarely distributed, short, pale, adpressed setae; setae on hemelytron dark and flattened, forming patches, simple setae on posterior part of corium and on cuneus present; legs mostly with pale spine like suberect setae, not very dense, tarsi with adpressed pale setae; black spinules on femora absent, tibia with spinules placed irregularly (fig. 19F in Namyatova et al., in press); abdomen mostly clothed with short adpressed pale setae and flattened setae on apical segments. STRUCTURE. Head. Distance between eye and pronotum shorter than eye diameter; occipital region not delimited with depression; longitudinal depression on vertex absent or very short; eyes stylate, directed outwards and forwards, subequal to 1/6 th of head width; distance between antennal fossa twice as long as antennal fossa diameter; frons only slightly swollen ( Fig. 10I), without paired outgrowths or only with pair of very shallow tubercles, without ridges or longitudinal depression; anterior view of head c. 1.9× as wide as high; eye height subequal to distance from eye to apex of clypeus; antennal fossa oval, diameter subequal to 2/3 rd of eye height, not raised (as in fig. 3B in Namyatova et al., in press), inferior margin placed near inferior margin of eye; base of clypeus placed near inferior margin of eye, delimited with depression; head flat in lateral view, gula shorter than buccula length, straight. Labium. Reaching middle of mesosternum or slightly surpassing it; LSI twice as long as wide; LSII c. 2.5× as long as wide, subequal to LSI; LSIII 2.5× as long as wide, subequal to LSII; LSIV c. 4× as long as wide, c. 1.5× as long as LSIII. Antenna. Reaching base of cuneus or slightly surpassing it; ASI c. 1.5× as long as wide (as in fig. 8E in Namyatova et al., in press), subequal to 1/4 th of head width; ASII c. 6× as long as segment I, slightly shorter than head and pronotum combined, slightly widened towards apex (as in fig. 8E in Namyatova et al., in press), without swelling basally and medially; ASIII c. 0.7× as long as ASII, widened towards apex; ASIV c. 0.7× as long as ASIII, clavate. Thorax. Collar distinct, fused with callosite region medially, flat ( Fig. 10I); calli separated, flat; depression delimiting calli posteriorly absent ( Fig. 10I); humeral angles of pronotum strongly dilated, serrate, with six lobes ( Fig. 10I); posterior margin of pronotum distinctly concave, forming right angles ( Fig. 10I); scutellum distinctly swollen, covering base of pronotum, of irregular shape, divided into six parts, obtuse apically ( Fig. 11I), covering base of pronotum, with longitudinal depression medially, without outgrowth medially; metepimeron enlarged, twice as high as wide, angulate and subtriangular (as in Fig. 13E); metasternum with medial projection reaching abdominal segment II (as in fig. 17A in Namyatova et al., in press). Hemelytron. Costal margin of hemelytron slightly rounded; claval commissure c. 0.2–0.3× as long as scutellum, straight; R + M distinct only anteriorly, not reaching posterior margin of corium; medial fracture strongly inclined towards midline; cuneus approximately twice long as wide, c. 0.7× as long as pronotum, medial margin slightly concave (as in fig. 13B in Namyatova et al., in press); membrane cell not surpassing apex of cuneus, forming right angle (as in fig. 13B in Namyatova et al., in press), c. 0.6–0.7× as long as pronotum; auxiliary vein absent or short; distance from cell to apex of membrane as long as or slightly shorter than cell length. Legs. Forecoxae contiguous (as in fig. 17A in Namyatova et al., in press); femora not swollen apically, straight; foretibia shorter than head and pronotum combined; tibia without swellings; segment I of hind tibia of as long as segment II and shorter than segment III; apical half of claw curved; basal tooth on claw elongate, slightly concave (as in Fig. 13J). Genitalia ( Fig. 17 AH–AK). Genital capsule wider than long, with small tubercle at each side, ventral wall not shortened anteriorly; left paramere r-shaped, c. 1.5–2× times as long as right paramere; phallobase sclerite of primary gonopore heartshaped, without outgrowths; ductus seminis not sclerotized basally and with narrow circle sclerite around secondary gonopore; ductus seminis as long as phallotheca, with coils forming wide tube, attached to phallobase medially; sclerotized part of phallotheca narrow, occupying half of dorsal part, widened and rounded apically; without ridge or outgrowth(s); endosoma with a number of serrate spicules of irregular shape).

Female: Body length 4–5 mm. COLORATION, TEXTURE, VESTITURE AND STRUCTURE ( Fig. 8). As in male. Genitalia ( Fig. 21C, D). DLP with single sclerotized ring, divided medially, with pair of striated areas; lateral oviducts attached at midpoint of striated areas, widely separated, placed near lateral margins of DLP; spermathecal gland placed posteriomedially, equidistant from lateral oviducts; posterior wall covered with small tubercles, without outgrowths or sclerotizations; base of second valvula slightly concave; ventral wall membranous.

Distribution: Democratic Republic of Congo, Cameroon, Ghana ( Fig. 24).

Host plants: Yangambia macarangae is known from Macaranga horaefolia ( Euphorbiaceae ) ( China, 1944).