Ischnobaena macerrima Stål, 1871, 1870

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 : 326-327

Ischnobaena macerrima Stål, 1871 Ischnobaena staliana Wygodzinsky, 1966

( Figs 25–27 ) Ischnobaena staliana Wygodzinsky,1966: 497 , 499 (original description).

Ischnobaena macerrima Stål, 1871: 703 (original description). Synty- Holotype: J, Philippines, Quezon, Lucban (USNM).

pe(s): J, Philippines (NHRS). Ischnobaena staliana : Mൺඅൽඈඇൺൽඈ-Cൺඉ*©ංඅൾඌ (1990: 132) (catalogue, Ischnobaena macerrima : Sඍචඅ (1874: 96) (catalogue, distribution); distribution).

Lൾඍ*üංൾ*©*©ඒ & Sൾඏൾ*©ංඇ (1896: 75) (catalogue, distribution); M* öAඍൾൾ

& Mൺඅඅඈ*ö*ü (1926: 146) (records); WඒǤඈൽඓංඇඌΚඒ (1966: 497, 499) Diagnosis. Body length about 36–38 mm, blackish-brown; (in key, records, distribution); Mൺඅൽඈඇൺൽඈ-Cൺඉ*©ංඅൾඌ (1990: 132) head (except ventral surface) uniformly dark brown; prono- (catalogue, distribution). tum with two paired yellowish-brown spots shortly before Type material examined. Lൾ*öඍඈඍඒඉൾ (present designation):J, “Ins. middle; metathorax slightly longer than prothorax; basal

\ Philipp.” [pr.]; “Semper.” [pr.]; “ Ischnobaena \ macerrima \ Stål” three fifths of fore tarsus whitish; mid and hind femora with [hw.]; “ Typus ” [pr., red rectangle with black frame]; “NHRS-GULI \ three to four narrow light-colored annuli, widely separated; 000001754” [pr.]. Mounted on card; tibia and tarsus of right fore leg, mid and hind tibiae with three narrow light-colored annuli left mid leg, tarsomere III of right mid leg, tibia and tarsus of left hind on basal half; paramere truncated at apex with one apical leg missing (NHRS). projection; apical portion of phallosoma not bifid; poste-

Diagnosis. Body length about 36.5 mm; head, anterior rior margin of abdominal sternite VII of female trilobated, part of prothorax and last abdominal segments orangish tergite VIII wider than long with dorsum flat.

-brown, strongly contrasting with the rest of body, which Distribution. Philippines: Luzon (WඒǤඈൽඓංඇඌΚඒ 1966).

is blackish-brown ( Fig. 25 ); metathorax slightly longer Remarks. This species can be readily recognized by its than prothorax; basal third of fore tarsus whitish (Fig. color pattern and the genital characters of both sexes.

26); mid and hind femora nearly unicolored; mid tibia The phallus of a paratype deposited in AMNH has been with three narrow light-colored annuli on basal third, photographed by Cൺඌඍ*©ඈ-Hඎൾ*©ඍൺඌ et(al 2021.: fig. S10) with the apical one much fainter ( Fig. 25 ); hind tibia and does not need to be reproduced here. A photo of the with two narrow light-colored annuli on basal fourth, paramere of the same specimen has also been examined in with the apical one fainter; dorsum of abdomen without the present study (V. Castro-Huertas, pers. comm.).

light-colored spots ( Fig. 25 ).

Distribution. Philippines: exact locality unknown (Sඍචඅ Discussion

1871);? Luzon (M*öAඍൾൾ & Mൺඅඅඈ*ö*ü (1926);? Samar

(WඒǤඈൽඓංඇඌΚඒ 1966). Comparative notes. The non-segmented fore tarsus, the

Remarks. This species is characterized by its contras- incompletely separated spiracle-bearing area of the male ting body color, which has been well documented in the abdominal segment VIII, and the relatively long labial segoriginal description (Sඍචඅ 1871). WඒǤඈൽඓංඇඌΚඒ (1966) ment II indicate that I. castroae sp. nov. belongs to Ischnoidentified a male specimen from Samar Island as this baena. Several characters of the pygophore, paramere and species, and illustrated its genitalia. He also mentioned phallus also support its generic placement. Ischnobaena that this species has “concolorous legs” and thus “can castroae sp. nov. is unique among Ischnobaena by its unibe considered to be the adult of dohrni [sic]” (WඒǤඈൽ- formly dark brown fore tarsus, whereas in other congeners ඓංඇඌΚඒ 1966). The lectotype (designated herein) was it is whitish on its basal part (at least basal third).

examined in the present study, and we found some dif- Ischnobaena castroae sp. nov. can be easily distinguferences from WඒǤඈൽඓංඇඌΚඒ’s (1966) account. Firstly, ished from I. macerrima by its uniform body coloration the legs of I. macerrima are not concolorous, and have (vs. the distinctly bicolorous I. macerrima ). The new the following light-colored annulations: fore femur with species can also be differentiated from the latter by: head a faint, incomplete annulus subapically; fore tibia with a with a pair of yellowish-brown spots dorsally behind eyes complete, relatively wide annulus submedially; mid and (vs. uniformly orange-brown in I. macerrima ); prothorax hind femora with three to four very faint, widely separated as long as metathorax (vs. shorter than metathorax in I.

annuli; mid tibia with three annuli on basal third, with macerrima ); mid and hind tibiae with three narrow, faint, the apical most one much fainter; hind tibia with two light-colored annuli on basal third (vs. mid tibia with three, annuli on basal fourth, with the apical one fainter. The hind tibia with two narrow annuli, with the apical-most male genitalia are also different from those illustrated by one much fainter in I. macerrima ); abdomen with paired WඒǤඈൽඓංඇඌΚඒ (1966), with the posterolateral margin of yellowish-brown spots on tergites II to VII (vs. without abdominal segment VIII produced but not sharply poin- such spots in I. macerrima ).

ted, and the shape of paramere seems different ( Fig. 27 ). Ischnobaena castroae sp. nov. can be readily separated Whether the specimen from Samar Island is conspecific from I. staliana by its male genital characters. The paramewith I. macerrima requires further study. re of I. castroae sp. nov. strongly expands ventrally at its M*öAඍൾൾ & Mൺඅඅඈ*ö*ü (1926) recognized a female midpoint, forming a triangular protrusion (vs. not expanded specimen from Luzon Island under the name I. macerri- in I. staliana ); the apex of the paramere is emarginated in ma, but they also noticed some different characters in the new species, forming two apical projections, of which their specimen; thus this identification is also doubtful. the dorsal one is short and round and the ventral one is Ischnobaena macerrima cited by Dංඌඍൺඇඍ (1903) actually longer and sharp (vs. apex of paramere truncated with refers to Ischnobaenella invisibilis (Dohrn, 1860) (see one apical projection in I. staliana ); the apical portion of WඒǤඈൽඓංඇඌΚඒ 1966). the phallosoma is bifid in I. castroae sp. nov. (vs. not bifid

in I. staliana ). Moreover, the posterolateral margin of the Oxford, UK), Petr Kment (National Museum, Prague, male abdominal segment VIII in I. staliana is broadly Czech Republic), and Valentina Castro-Huertas for helprounded, while in the new species it is more pronounced. ful comments and critical reading of the manuscript. This Ischnobaena castroae sp. nov. can also be distinguished work was supported by a grant from the National Natural from I. staliana by its different color pattern and the equal Science Foundation of China (No. 31730086).

length of the pro- and metathoraxes.

The markedly different color pattern between I. cas- References

troae sp. nov. and I. dohrnii indicates that they are not

CASTRO-HUERTAS V., FORERO D. & GRAZIA J. 2018: Compaconspecific. Since I. dohrnii is described by a nymph, its rative genitalic morphology in ten genera of thread-legged bugs of taxonomic status needs to be further evaluated (see the the tribe Metapterini , and its phylogenetic importance ( Hemiptera : above mentioned remarks). Heteroptera: Reduviidae ). Acta Entomologica Musei Nationalis As I. macerrima and the adult of I. dohrnii are of doub- Pragae 58: 91–125.

CASTRO-HUERTAS V., FORERO D. & GRAZIA J. 2021: Evolution tful identity in WඒǤඈൽඓංඇඌΚඒ (1966), the key to species

of wing polymorphism and genital asymmetry in the thread-legged provided by him is revised herein. In the revised key below, bugs of the tribe Metapterini Stål ( Hemiptera , Reduviidae , Emesinae) all the characters of I. macerrima are based on its lectotype, based on morphological characters. Systematic Entomology 46: 28–43. and the nymph-based I. dohrnii is excluded. DISTANT W. L. 1903–1904: The Fauna of British India, including Systematic position of Ischnobaena . WඒǤඈൽඓංඇඌΚඒ Ceylon and Burma. Rhynchota. – Vol. II. (Heteroptera). Taylor and

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spp.) and Berlandiana Villiers, 1949 (Malagasy, nine JEANNEL R. 1919: Résultats Scientifiques. Insectes Hémiptères. III. species). This opinion has been questioned by a recent Henicocephalidae et Reduviidae . In: Voyage de Ch. Alluaud et R. phylogenetic study of Metapterini , which recovered a Jeannel en Afrique Orientale (1911–1912). Léon Lhomme, Paris,

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sister relationship between Ischnobaena and Bobba Ber-

KERZHNER I. M. 1992: Nomenclatural and bibliographic correctigroth, 1914 (Afrotropical, five species) (Cൺඌඍ*©ඈ-Hඎൾ*©ඍൺඌ ons to J. Maldonado Capriles (1990) “Systematic catalogue of the et al. 2021). Since only one species of Ischnobaena was Reduviidae of the World ( Insecta: Heteroptera)”. Zoosystematica sampled by Cൺඌඍ*©ඈ-Hඎൾ*©ඍൺඌ et al. (2021), more studies Rossica 1: 46–60.

are necessary to further elucidate the systematic relati- LETHIERRY L. & SEVERIN G. 1896: Catalogue Général des Hé-

miptères. Tome III. Hétéroptères, Tingidae, Phymatidae, Aradidae, onships of this genus.

Hebridae, Hydrometridae, Henicocephalidae, Reduviidae , Saldidae,

Apophilidae, Ceratocombidae, Cimicidae,Anthocoridae. Friedländer Revised key to species and Fils, Berlin, 275 pp.

of Ischnobaena Stål, 1871 MALDONADO-CAPRILES J. 1990 : Systematic Catalogue of the

Reduviidae of the World ( Insecta: Heteroptera). A special edition of 1 Body distinctly bicolorous, with head, anterior part Caribbean Journal of Science, Mayagüez, 694 pp.

of prothorax and apex of abdomen orangish-brown, M*öATEE W. L. & MALLOCH J. R.1926: Philippine and Malayan strongly contrasting with the rest of body; mid tibia Ploiariinae ( Hemiptera , Reduviidae ). Philippine Journal of Science

30(1): 117–152, pls. 1–4.

with three, hind tibia with two, narrow light-colored SCHUH R. T., WEIRAUCH C. & WHEELER W. C. 2009:Phylogenetic annuli. ..................................... I. macerrima Stål, 1871 relationships within the Cimicomorpha ( Hemiptera : Heteroptera): a – Body almost uniformly blackish-brown; mid and hind total-evidence analysis. Systematic Entomology 34: 15–48.

tibiae with three narrow light-colored annuli. .......... 2 STÅL C. 1871: Hemiptera insularum Philippinarum. – Bidrag till Phi- 2 Metathorax as long as prothorax; fore tarsus dark lippinska öarnes Hemipter-fauna. Öfversigt af Kongliga Vetenskaps-

Akademiens Förhandlingar 27 [1870]: 607–776.

brown; paramere expanded at midpoint, with two STÅL C. 1874: Enumeratio Hemipterorum. Bidrag till en förteckning projections apically; apical portion of phallosoma bi- ofver alla hittills kända Hemiptera , jemte systematiska meddelanden. fid. .................................................... I. castroae sp. nov. 4. Kongliga Svenska Vetenskaps-Akademiens Handlingar (N. F.) – Metathorax longer than prothorax; fore tarsus with 12(1): 1–186.

basal three fifths whitish; paramere truncated apically VILLIERS A. 1948: Faune de l’Empire Français. IX. Hémiptères

Réduviidés de l’Afrique noire. Éditions du Muséum, Paris, 489 pp.

with one projection; apical portion of phallosoma not VILLIERS A. 1949: Révision des Émésides africains [Hémiptères bifid. ............................. I. staliana Wygodzinsky, 1966 Réduviides ]. Mémoires du Muséum National d’Histoire Naturelle

(N. S.) 23(2): 257–392.

Acknowledgements WEIRAUCH C. 2008a: Cladistic analysis of Reduviidae (Heteroptera:

Cimicomorpha) based on morphological characters. Systematic We sincerely thank Gunvi Lindberg (Naturhistoriska Entomology 33: 229–274.

Riksmuseet, Stockholm, Sweden) for providing images WEIRAUCH C. 2008b: From four- to three-segmented labium in

Reduviidae ( Hemiptera : Heteroptera). Acta Entomologica Musei of the types of I. dohrnii and I. macerrima . We are gra-

Nationalis Pragae 48: 331–344.

teful to Valentina Castro-Huertas (Museo de La Plata, La WYGODZINSKY P. W. 1966: A monograph of the Emesinae (Re- Plata, Argentina) for providing unpublished information duviidae, Hemiptera ). Bulletin of the American Museum of Natural and for fruitful discussions. We express our gratitude to History 133: 1–614.

Leonidas-Romanos Davranoglou (University of Oxford,

Figures

Figs. 25–27. Ischnobaena macerrima Stål, 1871, lectotype, J, lateral view: 25 – habitus with labels; 26 – fore leg; 27 – posterior part of abdomen. Scale bars: 25 = 10.00 mm; 26, 27 = 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.)