Spilopteron oblongulum, Ito & Maeto, 2017

Ito, Masato & Maeto, Kaoru, 2017, Revision of the genus Spilopteron Townes, 1965 (Hymenoptera: Ichneumonidae: Acaenitinae) from Japan, European Journal of Taxonomy 356, pp. 1-33 : 20-21

publication ID	https://doi.org/ 10.5852/ejt.2017.356
publication LSID	lsid:zoobank.org:pub:A7ED0BAC-2637-433D-9BD2-8A9E2C59B2CA
DOI	https://doi.org/10.5281/zenodo.3851926
persistent identifier	https://treatment.plazi.org/id/E842665F-8874-4BCA-92B0-919E768DADCE
taxon LSID	lsid:zoobank.org:act:E842665F-8874-4BCA-92B0-919E768DADCE
treatment provided by	Carolina
scientific name	Spilopteron oblongulum
status	sp. nov.

Treatment

Spilopteron oblongulum sp. nov.

urn:lsid:zoobank.org:act:E842665F-8874-4BCA-92B0-919E768DADCE

Figs 1 View Fig 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 View Materials , LC154927 View Materials 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 View Fig ). Clypeus 0.6 times as long as wide, with two lateral projections ( Figs 2g View Fig , 3g View Fig ). 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 View Fig ). Lateral area of pronotum densely punctate and transversely striate medially ( Fig. 5g View Fig ). Collar weakly punctate. Mesoscutum densely punctate. Subalar prominence extensively punctate ( Fig. 5g View Fig ). Scutellum densely punctate in dorsal view. Postscutellum roundly convex in lateral view ( Fig. 5g View Fig ). Metapleuron extensively punctate ( Fig. 5g View Fig ). Propodeum strongly carinate ( Fig. 6g View Fig ). Area externa densely punctate ( Fig. 6g View Fig ). Area basalis, area dentipara and area superomedia weakly carinate ( Fig. 6g View Fig ). Area posteroexterna confluent with area petiolaris ( Fig. 6g View Fig ). Fore wing length 11.5–14.0 mm. Vein cu-a basad of vein Rs&M ( Fig. 4g View Fig ). Vein rs-m opposite or basad of vein 2m-cu ( Fig. 4g View Fig ). 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 View Fig ). Antennal flagellum with a white band ( Fig. 1g View Fig ). 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 View Fig ).

Male (n = 4; genitalia, n = 2)

Similar to female ( Fig. 1h View Fig ). 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 View Fig ). Face, basal area of T1 yellowish brown. Hind femur and tibia yellow to brown.

Subgenital plate hexagonal with basal angle obtuse ( Fig. 8f View Fig ). Paramere short, basal part strongly projecting towards base of subgenital plate ( Fig. 7k View Fig ). Aedeagus gently curved, its penis valve ca 2.0 times as long as basal apodeme ( Fig. 7l View Fig ).

Distribution

Japan (Honshu).

Bionomics

Host unknown. Adults fly in August.