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

description: Bentyra ryukyuana sp. nov.
(New SJN: Kimadara-mame-togari-himebachi)
(Figs 19A–H, 63G, 65E, 66D)
Etymology. The specific name is from the Ryukyu Islands, where is locality of types.
Type series. Holotype: KPM-NK 81887, F, JAPAN, Kagoshima Pref., Tokunoshima Is., Tete, Mt. Amagi-dake, 27. III. 2011, K. Watanabe leg. Paratype: JAPAN, KPM-NK 81886, F, Okinawa Pref., Ishigakijima Is., Ishigaki City, Mt. Yarabudake, 25. III. 2012, M. Ito leg.
Description. Female (n=2). Body length 4.2–4.9 (HT: 4.9) mm. Body polished, covered with silver setae.
Head. Clypeus 2.0 times as wide as maximum length, sparsely punctate, its anterior margin weakly rounded. Face densely punctate, with a median weak convexity. MSL 1.15–1.2 (HT: 1.2) times as long as BWM. Frons sparsely punctate, with transverse rugae just above antennal sockets, with a median longitudinal groove. Gena punctate. Vertex sparsely punctate anteriorly, punctate posteriorly, with a median longitudinal groove (Fig. 19D). OOL slightly shorter than POL and as long as OD (Fig. 19D). Occipital carina complete, its lower end joined with hypostomal carina distant from mandibular base by the length of BWM. Upper tooth of mandible longer than lower tooth. Base of mandible slightly convex. Antenna with 20–21 (HT: 21) flagellomeres. FL I, FL II, and FL III almost equal in length. FL III 6.7–7.0 (HT: 6.7) times as long as maximum depth in lateral view. Apex of flagellum more or less pointed.
Mesosoma 1.75 times as long as maximum depth in lateral view. Upper side of collar with a median carina. Lateral part of pronotum largely smooth dorsally, largely striate ventrally. Epomia short and weak. Mesoscutum largely smooth, with a median longitudinal groove on the median lobe (Figs 19E, 63G). Notaulus long, its posterior ends joined with each other posteriorly (Figs 19E, 63G). Scutellum smooth except for a few punctures, without a lateral longitudinal carina except for base. Postscutellum smooth. Mesopleuron densely punctate except for areas above and below smooth speculum with longitudinal striae. The impression that is just below speculum with an isolate pit. Posterior transverse carina of mesosternum complete. Metapleuron densely punctate, with a complete juxtacoxal carina. Anterior and posterior transverse carinae of propodeum complete. Pleural carina complete. Basal section of lateral longitudinal carina of propodeum absent. Area basalis distinct (Fig. 65E). Area superomedia more or less indistinct laterally (Fig. 65E). Propodeum largely rugose-punctate. Propodeum without projections. Length of fore wing 3.6–4.2 (HT: 4.2) mm. Areolet absent (Fig. 19F). Vein 2m-cu of fore wing with two bullae (Fig. 19F). Nervellus inclivous, intercepted slightly posterior to middle (Fig. 19G). Hind femur 4.9 (HT: 4.9) times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.8: 0.6: 0.35: 0.6. Tarsal claws simple.
Metasoma. T I 1.25–1.4 (HT: 1.25) times as long as maximum width, largely longitudinally striated except for smooth posterior margin (Fig. 19H), the interspace of striae punctate. Median dorsal carina of T I indistinct. Dorsolateral carina of T I complete. T II to T VI wider than long. T II and T III densely punctate and longitudinally striated except for smooth posterior area (Fig. 19H). Laterotergite of T II separated from T II. T IV to T VII largely smooth, with fine and sparse punctures. Ovipositor sheath 0.5–0.58 (HT: 0.5) times as long as hind tibia. Ovipositor straight, with a weak nodus and ventral teeth (Fig. 66D).
Coloration (Figs 19A–H). Head yellow. Apex of mandible, dorso-median part of face, area above antennal sockets, and antenna more or less tinged with reddish brown. Oceller area, posterior and median parts of vertex, and postero-dorsal part of gena blackish brown. Mesosoma yellow. Latero-median part of pronotum reddish brown. Propleuron tinged with reddish brown. Mesopleuron with three reddish brown stripes, its posterior part relatively darkened than anteriorly. Scuto-scutellar groove blackish brown to black. Axillae black. Scutellum with a median brown spot. Mesopleuron with reddish brown areas below subtegular ridge and speculum. Metapleuron with blackish brown margins. Dorsal face of propodeum largely blackish brown to black. Area petiolaris with a median blackish brown to black area. Metasoma blackish brown to black. Posterior margins of T I to T V broadly yellow. Posterior margins of T VI and T VII narrowly yellow. Border of black and yellow areas tinged with reddish brown. Lateral part of T II to VII reddish brown to yellow. Membranous part of metasomal sternites yellow. Ovipositor reddish brown. Wings hyaline. Veins and pterostigma yellowish brown. Legs yellowish brown. Coxae, trochanters, trochantelli, and base of hind tibia whitish yellow except for ventral face of hind coxa reddish brown. Reddish brown areas of pronotum and mesopleuron darkened in paratype.
Male. Unknown.
Distribution. Japan (Tokunoshima Is. and Ishigakijima Is.).
Bionomics. Unknown.
Remarks. This species can be distinguished from other species by the following combination of character states: body length 4.2–4.9 mm (7.0 mm in Be. striata); median lobe of mesoscutum with a conspicuous median groove (without a median groove in Be. testacea); hind coxa without a black area (with a black area in Be. striata); mesosoma and metasoma with conspicuous reddish brown and black areas (almost entirely reddish brown in Be. taiwanella); fore wing without a clouded band (with a clouded band in Be. taiwanella); head with black area (without black area in Be. divisa).
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 77-78, DOI: 10.32225/bkpmnh.2021.50_55, http://zenodo.org/record/12774639