Ischnobaena castroae, Chen & Li & Cai, 2021

Chen, Zhuo, Li, Hu & Cai, Wanzhi, 2021, Taxonomic notes on the genus Ischnobaena (Hemiptera: Heteroptera: Reduviidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 61 (1), pp. 319-327 : 320-325

Ischnobaena castroae sp. nov. parts equal in length ( Fig. 5 ); postocular part conver-

( Figs 1–21 ) ging posteriorly and distinctly constricted at middle in Type material. Hඈඅඈඍඒඉൾ: J, “ PHILIPPINES, Mindanao \ Bukidnon, dorsal view ( Fig. 4 ); interocular furrow evenly curved Intavas \ (N8.26667°, E124.98333°) \ 2016-IV \ Ent.Mus. CAU.Beijing” backwards. Eyes rather small, protruding laterally, far [pr.]; “male sex symbol” [pr.]; “ HOLOTYPE [pr.] \ Ischnobaena [hw.] \ remote from dorsal and ventral margins of head in la- teral view. Antenna gracile; scape slightly longer than pedicel; basiflagellomere extremely short, about a tenth of length of distiflagellomere. Clypeus slightly elevated; labrum finely produced anteroventrally. Labium ( Figs 5, 6 ) long and slender, slightly curved between segments II and III; labial segment II longest, 2.25 times longer than segment III; segment IV 1.75 times longer than segment III, gradually narrowing to apex.

Thorax elongate. Prothorax ( Figs 4–6 ) 2.5 times as long as head, 5.2 times longer than its greatest width, slightly widened anteriorly; pronotum clearly divided into anterior and posterior lobes, with the latter extremely reduced, collar-like. Meso- and metathorax slightly swollen posteriorly, mesothorax 0.8 times as long as prothorax, metathorax as long as prothorax.

Fore leg ( Fig. 7 ) delicate; fore coxa cylindrical, 1.3 times longer than prothorax, very faintly widened towards apex; fore trochanter simple; fore femur long, 1.3 times as long as fore coxa, armed ventrally with two rows of spiniferous processes; anteroventral series composed of one or two large-sized and about 40 small-sized processes ( Fig. 7 ); posteroventral series composed of four large-sized, seven medium-sized and about 33 small-sized processes, the longest basalmost process situated apicad of midpoint of segment ( Fig. 7 ); fore tibia very short, 0.26 times as long as fore femur, widened apically, armed ventrally with 25 strongly sclerotized denticles ( Fig. 7 ); fore tarsus about half as long as fore tibia, strongly sclerotized ( Fig. 7 ); paired fore claws nearly equal in size. Mid and hind legs slender; hind femur slightly surpassing apex of abdomen; mid and hind tibiae 1.35 and 1.40 times longer than respective femora; mid tarsus with tarsomere I longest and II shortest.

Abdomen elongate, nearly parallel-sided, very weakly widened at apex; abdominal tergite VII ( Figs 8, 9, 11 ) projected posteriorly, warping upward, with apical margin round, leaving parameres and part of pygophore exposed in dorsal view; posterior margin of sternite VII concave at midpoint ( Fig. 10 ); segment VIII ( Figs 9, 10 , 12 ) distinctly exposed in lateral and ventral views, with anteromedial and posteromedial margins strongly concave, posterolateral margin posteriorly produced and rounded. Abdominal spiracles prominent.

Male genitalia: Pygophore ( Figs 13–15 ) enlarged, rounded, laterally compressed, covered with tiny curly setae; transverse bridge narrow; anterolateral margin of posterior opening of pygophore forming lamelliform projection ( Fig. 14 ); posterior margin faintly incised at midpoint ( Fig. 15 ). Paramere ( Figs 16–18 ) large and stout, distinctly expanded ventrally at midpoint, strongly emarginated at apex, forming two apical projections, with the dorsal one shorter and round, and the ventral one longer and sharp. Phallus ( Figs 19–21 ) moderately sclerotized, strongly curved; articulatory apparatus thickened, largely fused; apical portion of phallosoma distinctly bifid; endosoma tubular.

Female. Unknown.

Measurements [in mm, m# (n = 1)]. Length of body 36.10; length of head 1.90; length of anteocular part 0.80; length of postocular part 0.80; width across eyes 0.90; interocular space 0.60; length of antennal segments I–IV = 16.30, 14.40, 0.35, 3.10; length of labial segments II–IV = 0.90, 0.40, 0.70; length of pronotum 4.70; length of anterior pronotal lobe 4.30; length of posterior pronotal lobe 0.40; width of anterior pronotal lobe 0.90; width of posterior pronotal lobe 0.70; length of mesonotum 3.90; length of metanotum 4.70; length of fore coxa, trochanter, femur, tibia, tarsus (without claw) = 6.00, 0.70, 7.70, 2.00, 1.05; length

of mid femur, tibia, tarsus = 17.30, 23.50, 0.80; length of as valid species); Mൺඅൽඈඇൺൽඈ-Cൺඉ*©ංඅൾඌ (1990: 132) (catalogue, hind femur, tibia, tarsus = 22.00, 30.70,? (missing); length distribution). Incorrect subsequent spelling.

of abdomen 20.60; maximum width of abdomen 0.90. Type material examined. Lൾ*öඍඈඍඒඉൾ (present designation): nymph,

Etymology. The specific epithet is dedicated to the Colom- “Ins. \ Philipp.” [pr.]; “Semper.” [pr.]; “ Ischnobaena \ Dohrnii Stål ” bian entomologist Valentina Castro-Huertas (Museo de La [hw.]; “ Typus ” [pr., red rectangle with black frame]; “NHRS-GULI \

000001753” [pr.]. Mounted on triangle; left fore leg, tibiae and tarsi of Plata, La Plata, Argentina), for her excellent contributions

left mid and hind legs, apex of abdomen missing (NHRS).

to Emesinae and her helpful discussions on this study.

Distribution. Philippines: Mindanao. Diagnosis. This species is based on a last-instar nymph

( Fig. 22 ) and thus cannot be reliably identified (see remarks Ischnobaena dohrnii Stål, 1871 below). This species is characterized by body generally

( Figs 22–24 ) blackish-brown; fore femur with an incomplete light-colo- Ischnobaena Dohrnii Stål, 1871: 703 (original description). Syntype (s): red annulus subapically ( Fig. 23 ); basal third of fore tarsus nymph, Philippines (NHRS). whitish ( Fig. 23 ); mid and hind femora nearly unicolored; Ischnobaena Dohrnii : Sඍචඅ (1874: 96) (catalogue, distribution). mid and hind tibiae each with two narrow light-colored Ischnobaena Dohrni : Lൾඍ*üංൾ*©*©ඒ & Sൾඏൾ*©ංඇ (1896: 75) (catalogue,

annuli on basal fourth, with the basal one clear and the distribution). Incorrect subsequent spelling.

Ischnobaena dohrnii : M*öAඍൾൾ & Mൺඅඅඈ*ö*ü (1926:146) (synonymy under apical one much fainter ( Fig. 22 ).

I. macerrima ); Kൾ*©ඓ*üඇൾ*© (1992: 52) (nomenclature). Distribution. Philippines: exact locality unknown (Sඍචඅ Ischnobaena dohrni : WඒǤඈൽඓංඇඌΚඒ (1966: 497) (in key,records,resurrect 1871).

Remarks. Sඍචඅ (1871) described this species without it has the following light-colored annulations on its legs: stating the sex and the exact number of the type material. fore femur with one incomplete annulus subapically; WඒǤඈൽඓංඇඌΚඒ (1966) examined the syntype and found it fore tibia with one complete, relatively wide annulus was a last-instar nymph. He also noted that “the tip of the submedially; mid femur with four, hind femur with abdomen is lacking, which may explain why Sඍචඅ (1871) three, narrow and faint annuli, widely separated; mid and did not indicate the sex of his specimen” (WඒǤඈൽඓංඇඌΚඒ hind tibiae each with two narrow annuli on basal fourth, 1966) ( Fig. 24 ). with the basal one clear and the apical one much fainter.

Ischnobaena dohrnii was synonymized under I. ma- Although the number and arrangements of leg annulaticerrima by M*öAඍൾൾ & Mൺඅඅඈ*ö*ü (1926), as they thought ons are different from other congeners, it seems hard to that the color pattern was not a reliable character to elucidate the taxonomic status of I. dohrnii at present. distinguish these two species. This opinion was rejected On one hand, the syntype does not have an exact locality by WඒǤඈൽඓංඇඌΚඒ (1966) and Mൺඅൽඈඇൺൽඈ-Cൺඉ*©ංඅൾඌ (given as “Ins. Philipp.” with no further details), and on (1990). WඒǤඈൽඓංඇඌΚඒ (1966) tentatively assigned adul- the other hand, the morphological characters used for ts for this species based on leg annulations, which are the diagnosis of this species might be nymph-specific. more pronounced in nymphs than in adults. Ischnobaena Therefore , we treat I. dohrnii as an incertae sedis taxon dohrnii was reported to “virtually lack light-colored an- herein. This problem might be solved with molecular nuli” on legs (WඒǤඈൽඓංඇඌΚඒ 1966). However, according techniques, and/or with the acquisition of nymphs from to our examination on the lectotype (designated herein), all the known species.

Figures

Figs 4–11. Ischnobaena castroae sp. nov., holotype, J: 4–6 – anterior part of body; 7 – fore leg; 8–11 – posterior part of abdomen. 4, 8 – dorsal view; 5, 9 – lateral view; 6, 7, 10 – ventral view; 11 – caudal view. Scale bars: 4–7 = 2.50 mm; 8–10 = 2.00 mm; 11 = 1.00 mm.

Figs 1–3. Ischnobaena castroae sp. nov., holotype, J, habitus: 1 – dorsal view; 2 – lateral view; 3 – ventral view. Scale bar: 10.00 mm.

Figs 12–21. Ischnobaena castroae sp. nov., holotype, J: 12 – abdominal segment VIII; 13–15 – pygophore; 16–18 – paramere; 19–21 – phallus. 12, 21 – ventral view; 13, 19 – dorsal view; 14, 20 – lateral view; 15 – caudal view. Scale bars: 12–15 = 1.00 mm; 16–18 = 0.80 mm; 19–21 = 0.55 mm.

Figs 22–24. Ischnobaena dohrnii Stål, 1871, lectotype, nymph, lateral view: 22 – habitus with labels; 23 – fore leg; 24 – posterior part of abdomen. Scale bars: 22 = 10.00 mm; 23, 24 = 2.50 mm. (Photographed by G. Lindberg, ©NHRS, made available by the Swedish Museum of Natural History under Creative Commons Attribution 4.0 International Public License, CC-BY 4.0.)