Spilopteron oblongulum Ito & Maeto 2017, sp. nov.
Creators: name: Ito, Masato
name: Maeto, Kaoru
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Spilopteron
Spilopteron oblongulum

description: Spilopteron oblongulum sp. nov.
urn:lsid:zoobank.org:act: E842665F-8874-4BCA-92B0-919E768DADCE
Figs 1 g–h, 2g, 3g, 4g, 5g, 6g, 7k–l, 8f
Etymology
The specific epithet of this new species is derived from the long ovipositor sheath.
Type material
Holotype
JAPAN: 1 ♀, “Oku-nikko, Nikko-shi, Tochigi Pref., Japan, 9. August 1980, K. Konishi leg.” (NIAES).
Paratypes
JAPAN: 1 ♀, Doudaira, Tanzawa, Kanagawa Pref., 29 Aug. 1993 T. Kinoshita (NIAES); 1 ♀, 1 ♂, Mt Mikuniyama, Yamakita-cho, Kanagawa Pref., 11 Aug. 2015, T. Taniwaki (LC154926, LC154927 KPMNH); 1 ♂, same locality, 1–2 Aug. 2005, M. Takakuwa (NIAES); 1 ♂, Mt Hotaka-san, Katashinamura, Gumma Pref., 2 Aug. 2007, K. Watanabe (KPMNH); 1 ♂, Mt Ontake-san, Outaki-mura, Nagano Pref., 7 Aug. 2010, K. Watanabe (KPMNH).
Differential diagnosis
This new species most resembles S. flavescutatum Wang, 2004 and S. longitubus Wang, 2004 from China, but is easily distinguished from the former by the long T1, which is 3.5–4.3 times as long as wide (2.7 times in S. flavescutatum), and from the latter by the polished area petiolaris (rugose in S. longitubus); the female antenna has 35 flagellomeres (43 flagellomeres in S. longitubus), and the male S1 ends in front of the spiracles of T1 (a little behind in S. longitubus). ML analysis indicates that this species is most closely related to S. apicale. Morphologically, this species shares some unique character states with S. apicale, such as the shape of clypeus and the depression between the eye and antennal socket, but it has an obviously longer ovipositor.
Description
Female (n = 3)
BODY LENGTH. 13.0–17.0 mm.
HEAD. Vertex 0.5 times as long as maximum length of eye in dorsal view. Frons without a depression between eye and antennal socket in frontal view (Fig. 2g). Clypeus 0.6 times as long as wide, with two lateral projections (Figs 2g, 3g). Face 0.7–0.8 times as long as wide. Length of malar space 1.0–1.1 times as long as basal mandibular width. Ocello-ocular line/lateral ocellar diameter = 1.4–1.6. Postocellar line/ lateral ocellar diameter = 1.1. Antenna with 35 flagellomeres; first flagellomere 1.2–1.3 times as long as second flagellomere.
MESOSOMA. Propleuron densely punctate (Fig. 5g). Lateral area of pronotum densely punctate and transversely striate medially (Fig. 5g). Collar weakly punctate. Mesoscutum densely punctate. Subalar prominence extensively punctate (Fig. 5g). Scutellum densely punctate in dorsal view. Postscutellum roundly convex in lateral view (Fig. 5g). Metapleuron extensively punctate (Fig. 5g). Propodeum strongly carinate (Fig. 6g). Area externa densely punctate (Fig. 6g). Area basalis, area dentipara and area superomedia weakly carinate (Fig. 6g). Area posteroexterna confluent with area petiolaris (Fig. 6g). Fore wing length 11.5–14.0 mm. Vein cu-a basad of vein Rs&M (Fig. 4g). Vein rs-m opposite or basad of vein 2m-cu (Fig. 4g). Hind femur 4.7–5.1 times as long as maximum depth in lateral view, without distinct convexity ventrally. Hind tibia 13.3–13.5 times as long as maximum depth in lateral view. First hind tarsomere 2.3–2.6 times as long as second and 3.5–3.8 times as long as longer hind tibial spur.
METASOMA. T1 2.9–3.7 times as long as maximum width, 2.1–2.2 times as long as T2. T2 0.9–1.0 times as long as maximum width. T1 weakly and sparsely punctate. T2–T8 weakly and densely punctate. S1 without distinct sharp projection basally. Ovipositor sheath 2.3–2.6 times as long as hind tibia.
COLOR. Body black (Fig. 5g). Antennal flagellum with a white band (Fig. 1g). Inner margin of eye, clypeus, basal area of mandible, scutellum, postscutellum, area petiolaris and apices of T1 and T2 yellow. Fore and mid legs, trochanter, trochantellus and hind tarsus tinged yellowish brown. Fore wing with an apical dark mark extending downwards (Fig. 4g).
Male (n = 4; genitalia, n = 2)
Similar to female (Fig. 1h). Vertex 0.6–0.7 times as long as maximum length of eye in dorsal view. Face 0.7–0.8 times as long as wide. Ocello-ocular line/lateral ocellar diameter = 1.3–1.5. Postocellar line/ lateral ocellar diameter = 0.9–1.3. Antenna with 39–41 flagellomeres; first flagellomere 1.0–1.2 times as long as second flagellomere. Fore wing length 12.0– 14.5 mm. Hind femur 5.5–5.7 times as long as maximum depth in lateral view. Hind tibia 12.6–14.0 times as long as maximum depth in lateral view. First hind tarsomere 2.2–2.4 times as long as second and 4.3–4.8 times as long as longer hind tibial spur. T1 3.5–4.3 times as long as maximum width. S 1 in front of spiracles of T1. T2 1.0–1.1 times as long as maximum width. Antennal flagellum yellowish brown, without a white band (Fig. 1h). Face, basal area of T1 yellowish brown. Hind femur and tibia yellow to brown.
Subgenital plate hexagonal with basal angle obtuse (Fig. 8f). Paramere short, basal part strongly projecting towards base of subgenital plate (Fig. 7k). Aedeagus gently curved, its penis valve ca 2.0 times as long as basal apodeme (Fig. 7l).
Distribution
Japan (Honshu).
Bionomics
Host unknown. Adults fly in August.
description: Published as part of Ito, Masato & Maeto, Kaoru, 2017, Revision of the genus Spilopteron Townes, 1965 (Hymenoptera: Ichneumonidae: Acaenitinae) from Japan, pp. 1-33 in European Journal of Taxonomy 356 on pages 20-21, DOI: 10.5852/ejt.2017.356, http://zenodo.org/record/3836333