Surculus japonicus Watanabe, 2021, sp. nov.
Creators: name: Watanabe, Kyohei
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Surculus
Surculus japonicus

description: Surculus japonicus sp. nov.
(New SJN: Hosomi-mame-togari-himebachi)
(Figs 18A–G, 62H, 63F, 64A, 65X, 66C)
Etymology. The specific name is from Japan.
Type series. Holotype: KPM-NK 81861, F, JAPAN, Nagano Pref., Outaki Vil., Mt. Ontakesan, Hakkaisan, 4. VIII. 2007, K. Watanabe leg. Paratypes: JAPAN, KPM-NK 81872, F, Tochigi Pref., Kuriyama Vil., Kinunuma, 1–14. VIII. 2004, H. Makihara leg. (MsT); KPM-NK 81863, F, Nagano Pref., Nagawa Town, Daimon, Utsukushimatsu, 26. VIII. 2011, S. Fujie leg.; KPM-NK 81862, F, Nagano Pref., Outaki Vil., Mt. Ontakesan, Tanohara, 8. VIII. 2007, K. Watanabe leg.; KPM-NK 81864, F, Nagano Pref., Ōtaki Vil., Mt. Ontake-san, 13–25. VI. 2015, S. Shimizu leg. (MsT); KPM-NK 81860, 81865, 81866, 3 F, Toyama Pref., Toyama City, Arimine, Jyuroudani, 8–15. IX. 2009, M. Watanabe et al. leg. (MsT); KPM-NK 81858, 81859, 81867–81869, 5 F, ditto, 15–22. IX. 2009; KPM-NK 81870, 81871, 2 F, Toyama Pref., Toyama City, Arimine, Inonedani, 15–22. IX. 2009, M. Watanabe et al. leg. (MsT).
Description. Female (n=15). Body length 4.6–7.1 (HT: 5.7) mm. Body covered with silver setae.
Head. Clypeus 1.8 times as wide as maximum length, its anterior margin rounded with a median broad subtruncate convexity (Fig. 62H). Face polished, punctate (Fig. 18B). MSL 0.8 times as long as BWM. Frons, gena, and vertex polished, with fine punctures. OOL longer than POL. Occipital carina complete, its lower end joined with hypostomal carina distant from mandibular base. Upper tooth of mandible almost as long as lower tooth. Base of mandible slightly convex. Antenna with 18–19 (HT: 18) flagellomeres, subapical part not widened, all segments longer than wide. FL III 6.0–7.0 (HT: 7.0) times as long as maximum depth in lateral view. Apex of flagellum with some robust setae.
Mesosoma 1.7 times as long as maximum depth in lateral view. Upper side of collar with a median carina that is not much stronger than surrounding carinae. Lateral part of pronotum largely smooth except for some longitudinal striae medially (Fig. 18D). Epomia long and strong (Fig. 18D). Mesoscutum polished, punctate except for postero-median rugulose area (Fig. 18E). Notaulus long, fading our near center of mesoscutum (Figs 18E, 63F). Scutellum punctate, without a lateral longitudinal carina except for base. Mesopleuron smooth except for areas below subtegular ridge and speculum with longitudinal striae (Fig. 18D). The impression that is just below speculum with a pit, which situated in the short horizontal groove that joins mesopleural suture. Posterior transverse carina of mesosternum largely absent in front of mid coxae. Metapleuron largely punctate, with a complete juxtacoxal carina. Anterior and posterior transverse carinae of propodeum complete (Fig. 64A).Anterior section of lateral longitudinal carina of propodeum absent (Fig. 64A). Area basalis distinct (Fig. 64A). Area superomedia indistinct laterally (Figs 18G, 64A). Anterior part of propodeum punctate. Median and posterior parts of propodeum longitudinally, obliquely, and irregularly rugulose. Propodeum without projections (Figs 18G, 64A). Length of fore wing 4.4–5.6 (HT: 4.9) mm. Areolet absent (Fig. 18F). Vein 2m-cu of fore wing with two bullae (Fig. 18F). Nervellus inclivous, intercepted near the middle (Fig. 18F). Hind femur 4.8–5.3 (HT: 5.3) times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.9–0.95 (HT: 0.9): 0.6: 0.25–0.3 (HT: 0.3): 0.4–0.5 (HT: 0.4). Tarsal claws simple.
Metasoma. T I slender, 2.35–2.6 (HT: 2.6) times as long as maximum width, largely longitudinally striated except for smooth posterior margin, its sternite ending at far behind of spiracle, its spiracle situated near the basal 0.45. Median dorsal carina of T I present except for posterior part absent. Dorsolateral carina of T I complete. T II to T VI wider than long. T II rugose-punctate anterior 0.75 except for smooth area around thyridium, posterior 0.25 smooth. Laterotergite of T II narrow and separated from T II. T III rugose-punctate except for posterior 0.25 smooth. T IV to T VII covered with fine punctures except for smooth posterior margin. Apex of T VIII protruding and its apex subtruncate. Ovipositor sheath 1.43–1.5 (HT: 1.5) times as long as hind tibia. Ovipositor straight, with a weak nodus and ventral teeth (Fig. 66C).
Coloration (Figs 18A–G). Body (excluding wings and legs) black to blackish brown. Scape, pedicel, and base of FL I reddish brown (but dorsal part of scape usually darkened). Mandible yellowish brown except for darkened apex. Palpi and tegula yellow. Metasomal tergites more or less tinged with reddish brown. T I except for posterior margin and apex of metasoma usually black or darkened. T II sometimes partly darkened medially. Membranous part of metasomal sternites yellowish brown. Sclerotized part of metasomal sternites dark brown. Ovipositor reddish brown. Wings hyaline. Veins and pterostigma brown to blackish brown. Fore and mid legs whitish yellow to yellowish brown. Mid femur, tibia, and tarsus partly tinged with blackish brown. Hind coxa black, sometimes narrowly tinged with yellowish brown. Hind trochanter and trochantellus whitish yellow. Hind femur, tibia, and tarsus reddish brown to dark reddish brown. Base and apical parts of hind tibia and tarsus more or less darkened. Tibial spurs whitish yellow.
Male. Unknown.
Distribution. Japan (Honshu).
Bionomics. Unknown.
Remarks. This species resembles Sur. oculatus but it can be distinguished by the nervellus intercepted near the middle (near the posterior end in Sur. oculatus), the sternaulus absent in posterior 0.4 of mesopleuron (nearly complete in Sur. oculatus), the anterior transverse carina of propodeum complete (absent medially in Sur. oculatus), the area basalis of propodeum present (absent in Sur. oculatus), and the vein 3rs-m of fore wing absent (present in Sur. oculatus).
description: Published as part of Watanabe, Kyohei, 2021, Taxonomic and Zoogeographic Study of the Japanese Phygadeuontinae (Hymenoptera, Ichneumonidae), with Descriptions of 17 New Species, pp. 55-136 in Bulletin of the Kanagawa Prefectural Museum (Natural Science) 50 on pages 75-77, DOI: 10.32225/bkpmnh.2021.50_55, http://zenodo.org/record/12774639