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ACTA ENTOMOLOGICA 61(1): 319–327 MUSEI NATIONALIS PRAGAE Doi: 10.37520/Aemnp.2021.018 2021 ACTA ENTOMOLOGICA 61(1): 319–327 MUSEI NATIONALIS PRAGAE doi: 10.37520/aemnp.2021.018 ISSN 1804-6487 (online) – 0374-1036 (print) www.aemnp.eu RESEARCH PAPER Taxonomic notes on the genus Ischnobaena (Hemiptera: Heteroptera: Reduviidae) Zhuo CHEN, Hu LI & Wanzhi CAI*) Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Yuanmingyuan West Road, Beijing 100193, China *) corresponding author: e-mail address: [email protected] Accepted: Abstract. The previously known species of the thread-legged bug genus Ischnobaena Stål, 7th July 2021 1871 (Hemiptera: Heteroptera: Reduviidae: Emesinae: Metapterini), namely I. dohrnii Stål, Published online: 1871, I. macerrima Stål, 1871 and I. staliana Wygodzinsky, 1966, are reviewed and diagnosed. 7th August 2021 Lectotypes are designated for I. dohrnii and I. macerrima. A new species, I. castroae sp. nov., from Mindanao Island in the Philippines is described and photographed. The new species can be distinguished from its congeners primarily by the unicolored fore tarsus and several male genital characters. A revised key to species of Ischnobaena is provided. Key words. Hemiptera, Heteroptera, Reduviidae, Emesinae, Metapterini, lectotype, new species, taxonomy, Philippines, Oriental Region Zoobank: http://zoobank.org/urn:lsid:zoobank.org:pub:C67870A6-AD1B-4112-A08B-697AD207C741 © 2021 The Authors. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Licence. Introduction sampled in the recent morphology-based phylogenetic study of Metapterini (C-H et al. 2021). Metapterini Stål, 1874 is the largest tribe of the thread- In the present paper, the three known species of Ischno- legged bug subfamily Emesinae, comprising about 300 baena are reviewed and diagnosed. Some inaccurate species in 34 genera worldwide (M-C records of these species in historical references are noted. 1990, C-H et al. 2021). Wing polymorphism The identities of I. dohrnii Stål, 1871 and I. macerrima Stål, is rather infrequent in Metapterini, with 22 out of 33 1871 in MA M (1926) and W genera (except the nymph-based Roslania Distant, 1913) (1966) are doubtful and have caused taxonomic confusions. being known only from apterous forms, the other seven In order to stabilize the nomenclature regarding I. dohrnii possessing both apterous and macropterous forms (C- and I. macerrima, and to correctly apply the names in the -H et al. 2021). future, we designated lectotypes for the two species. The Ischnobaena Stål, 1871 is one of the apterous genera taxonomic status of I. dohrnii is evaluated and considered of Metapterini. This genus was originally established to as incertae sedis. A new species from Mindanao Island is include two Philippine species (S 1871). Several species described and photographed. Additionally, a revised key from tropical Africa as well as southern and southeastern to the species of Ischnobaena is provided. Asia were later described in the genus, until W (1966) revised the genus and erected new genera for the Material and methods species outside the Philippines. Ischnobaena currently consists of three species, all restricted to the Philippines Data labels of specimens are copied verbatim in quota- (M-C 1990). Although large-sized tion marks (“ ”); lines on the same label are separated by a among assassin bugs, nothing is known about the biology backslash (\), diff erent labels are separated by a semicolon and ecology of Ischnobaena species, primarily due to their (;), and comments on label data are provided in square secretive habits which render them diffi cult to collect. A brackets ([ ]); printed (pr.) and handwritten (hw.) texts are single species, I. staliana Wygodzinsky, 1966, has been indicated. Abbreviations for depositories: Chen.indd 319 06.08.2021 19:33:15 320 CHEN et al.: Taxonomic notes on the genus Ischnobaena (Hemiptera: Reduviidae) AMNH American Museum of Natural History, New York, USA; castroae sp. n. [hw.] \ Det. CHEN Zhuo [pr.]”; “CAU-RE-0000008 \ Ent. CAU Entomological Museum of China Agricultural University, Mus. CAU. Beijing” [pr.]. (CAU). Beijing, China; NHRS Naturhistoriska Riksmuseet, Stockholm, Sweden; Diagnosis. Body largely blackish-brown; head with two USNM United States National Museum of Natural History, Washin- paired yellowish-brown spots dorsally behind eyes; thorax gton, D.C., USA. almost uniformly blackish-brown; metathorax as long as Male genitalia were immersed in hot 10% KOH prothorax; fore tarsus uniformly dark brown; mid and hind solution for approximately fi ve minutes to remove soft femora nearly unicolored; mid and hind tibiae with three tissue, rinsed in distilled water, and dissected under a narrow, faint, light-colored annuli on basal third; paramere Motic binocular dissecting microscope. The dissected and expanded at midpoint, emarginated at apex, forming two macerated genitalia were placed in a vial with glycerin apical projections; apical portion of phallosoma bifi d. and pinned under the corresponding specimen after exa- Description. Apterous male (Figs 1–3). Coloration. Body mination. Photographs were all taken using a Canon 7D generally blackish-brown. Head (Figs 4–6) with two pai- Mark II digital camera equipped with a Canon micro lens red spots dorsally behind eyes, labrum, dorsum of neck EF 100 mm and MP-E 65 mm for habitus images, and an and ventral surface yellowish-brown; clypeus and labium Olympus BX51 microscope for the dissected body parts. brown, labial segment IV slightly darker; eyes reddish; Helicon Focus version 5.3 was used for image stacking. antennal scape brown basally, yellowish-brown subba- Measurements were obtained using a calibrated microme- sally, gradually darkened towards apex; antennal pedicel ter. Morphological terminology mainly follows W- and fl agellomeres dark brown. Thorax rather unicolored; (1966), W (2008a) and C-H acetabula lighter. Fore leg (Fig. 7) dark brown; fore coxa et al. (2018). The visible labial segments are numbered as with basal third light yellowish-brown; fore femur gradu- II to IV, given that the fi rst segment is lost or fused into ally darkened towards apex, with large and medium-sized the head capsule in most Reduviidae (W 2008b, spiniferous processes yellowish-brown to light brown, S et al. 2009). apical spine of process black; fore tibia blackish-brown, with a relatively wide, submedial, light yellowish-brown Taxonomy annulus, denticles on ventral surface black; mid and hind coxae and trochanters dark brown; mid and hind femora li- Genus Ischnobaena Stål, 18 71 ght brown, gradually darkened towards apex, with extreme Ischnobaena Stål, 1871: 703 (original description). Type species: Ischno- apices blackish; mid femur with three, hind femur with two, baena macerrima Stål, 1871 , subsequent designation by D very narrow light-colored annuli, hard to observe; mid and (1903: 213). hind tibiae brown, gradually darkened towards apex, with Ischnobaena: S (1874: 93, 96) (in key, catalogue); L & S (1896: 75) (catalogue); MA & M (1926: 119, three narrow light-colored annuli on basal third. Abdominal 146) (in key, listed); W (1966: 436, 496, 497) (in key, tergite I dark brown; 1 + 1 lateral spots at intersegmental redescription, distribution, key); M-C (1990: sutures between tergites II to VII yellowish brown; dorsal 131) (catalogue); C-H et al. (2021: File S4) (diagnosis, laterotergites brown. distribution, in key). Structure. Body surface smooth, moderately polished, Diagnosis. Apterous; labial segment II reaching anterior sparsely covered with tiny, decumbent or suberect, curly margin of eyes, more than two times as long as segment setae; ventral surface of labium with tiny, hard-to-observe III; metathorax as long as or longer than prothorax; ante- suberect setae; antennal fl agellomeres and apex of pedicel roventral series of fore femur widely interrupted at base; densely covered with short, decumbent pubescence; me- fore tibia quarter as long as fore femur; fore tarsus not sothorax with a triangular velvety area laterally on each segmented; paramere rod-shaped, without sensory cones; side (Fig. 5); ventral surfaces of fore tibia and spiny area fi rst valvifers of female fused. of fore femur with relatively long, erect setae intermixed Diversity and distribution. Four species, endemic to the with processes or denticles; apical third of inner surface of Philippines. fore tibia with long, thick, decumbent golden setae (Fig. 7); Remarks. A detailed redescription of the genus was pre- ventral surface of fore tarsus with two rows of shorter, thick, sented by W (1966), who also proposed the decumbent golden setae; mid and hind tibiae covered with fused fi rst valvifers (as “gonocoxites”) of the female to short, decumbent or suberect setae, gradually denser towards represent an autapomorphy of the genus. C-H- apex; lateral and ventral surfaces of mid tarsus densely et al. (2021: File S4) revised the generic diagnosis covered with short pubescence; apical half of abdominal and added a set of male genital characters. References to tergite VII covered with dense curly setae. Ischnobaena by D (1903), J (1919), V Head (Figs 4–6) subcylindrical, 2.1 times as long as (1948, 1949) and H (1965) refer to other genera (see width across eyes, 1.5 times as broad across eyes as in- W 1966). terocular space, convex dorsally (especially on anterior lobe) and fl attened ventrally; anteocular and postocular Ischnobaena castroae sp. nov. parts equal in length (Fig. 5); postocular part conver- (Figs 1–21) ging posteriorly
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