Spilopteron pseudonigrum sp. nov.

urn:lsid:zoobank.org:act: 649F2A74-91F4-44EB-A17B-0F9687FE819D

Figs 1 i–j, 2h, 3h, 4h, 5h, 6h, 7m–n, 8g

Etymology

The specific epithet of this new species is derived from the similarity to S. nigrum sp. nov.

Type material

Holotype

JAPAN: ♀, “ Mt. Hyonosen, Yabu-shi, Hyogo Pref., Japan, 16 June–14 July 2013, M. Ito & S. Fujie leg.” Malaise trap, (OMNH).

Paratypes

JAPAN: 7 ♂♂, Kawaratai, Nishimeya-mura, Aomori Pref., Malaise trap, 12–21 Jun. 2013, T. Nakamura (LC154923, LC154924 EUM); 6 ♂♂, same locality, Malaise trap, 21–30 Jun. 2013, T. Nakamura (EUM); 2 ♀♀, 5 ♂♂, same locality, Malaise trap, 30 Jun.–15 Jul. 2013, T. Nakamura (LC154922 EUM); 1 ♀, Asahi-kosen, Yamagata Pref., 23 Jul. 1971, A. Nagatomi (SEHU), 1 ♂, Mt Yudono-san, Asahi-mura, Yamagata Pref., 12 Aug. 1996, N. Takahashi (OMNH); 1 ♀, Hinoemata-mura, Fukushima Pref., 24–25 Aug. 1989, K. Konishi (NIAES); 1 ♀, Suginosawa, Myoko-shi, Niigata Pref., 3 Aug. 2012, M. Ito (KPMNH); 1 ♀, same locality, 16 Jul. 2013, S. Shimizu (KPMNH); 1 ♀, same locality, 17 Aug. 2013, S. Shimizu (KPMNH); 2 ♀♀, Mt Hotaka-san, Katashina-mura, Gunma Pref., 1 Aug. 2007, T. Ishizaki (KPMNH); 1 ♀, same locality, 2 Aug. 2007, M. Irie (KPMNH); 1 ♀, Hirogawara, Ashiyasumura, Yamanashi Pref., 14 Jul. 1996, T. Tachi (OMNH); 1 ♀, Mt Hakkaisan, Outaki-mura, Nagano Pref., 28 Jul. 2013, S. Shimizu (KPMNH); 1 ♀, Hirugano-kogen, Gujo-shi, Gifu Pref., 8 Jul. 2006, H. Yoshida (OMNH); 1 ♀, Nakajima, Ono-shi, Fukui Pref., Malaise trap, 22 Jun.–13 Jul. 2014, S. Fujie and T. Hirooka (OMNH); 1 ♀, Mt Haku-san, Ishikawa Pref., 3 Aug. 1988, I. Togashi (NIAES); 9 ♀♀, 1 ♂, same data as holotype (OMNH); 1 ♀, Mt Koya-yama, Odamiyama, Ehime Pref., 11 Jul. 1994, E. Yamamoto (NIAES).

Differential diagnosis

This new species most resembles S. nigrum sp. nov., although it can be distinguished by the merely infuscate apical area of the fore wing (with a distinct apical mark in S. nigrum sp. nov.). Although S. pseudonigrum sp. nov. and S. nigrum sp. nov. are difficult to distinguish from each other, they are distinct by molecular analysis (Fig. 9); the genetic distance between them was about 9.8 %. This species also resembles S. brachyurum sp. nov., but it has a square area superomedia of the propodeum (the area is rounded in S. brachyurum sp. nov.).

Description

Female (n = 27).

BODY LENGTH. 6.5–9.5 mm.

HEAD. Vertex 0.4 times as long as maximum length of eye in dorsal view. Frons without a depression between eye and antennal socket in frontal view (Fig. 2h). Clypeus 0.3–0.6 times as long as wide, with three weak projections of equal size (Figs 2h, 3h). Face 0.7 times as long as wide. Length of malar space 1.1–1.3 times as long as basal mandibular width. Ocello-ocular line/lateral ocellar diameter = 1.3–1.7. Postocellar line/lateral ocellar diameter = 1.2. Antenna with 27–28 flagellomeres; first flagellomere 1.2– 1.4 times as long as second flagellomere.

MESOSOMA. Propleuron densely punctate (Fig. 5h). Lateral area of pronotum densely punctate and transversely striate medially. Collar weakly and sparsely punctate. Mesoscutum densely punctate (Fig. 5h). Subalar prominence extensively punctate (Fig. 5h). Scutellum sparsely punctate in dorsal view. Postscutellum flattened in lateral view (Fig. 5h). Metapleuron sparsely punctate (Fig. 5h). Propodeum strongly carinate (Fig. 6h). Area superomedia square. Area externa and area dentipara sparsely punctate (Fig. 6h). Area basalis and area superomedia polished (Fig. 6h). Area posteroexterna confluent with area petiolaris and polished (Fig. 6h). Fore wing length 6.0– 8.5 mm. Vein cu-a basad of vein Rs&M (Fig. 4h). Vein rs-m opposite or distad of vein 2m-cu (Fig. 4h). Hind femur 3.5–3.7 times as long as maximum depth in lateral view, without distinct convexity ventrally. Hind tibia 8.7–9.5 times as long as maximum depth in lateral view. First hind tarsomere 2.4–2.8 times as long as second one and 2.1–2.4 times as long as longer hind tibial spur.

METASOMA. T1 1.9–2.4 times as long as maximum width, 2.2–2.7 times as long as T2. T2 0.5–0.7 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 2.0–2.3 times as long as hind tibia.

COLOR. Body black (Fig. 1i). Antennal flagellum with a white band (Fig. 1i). Inner margin of eye and middle area of mandible yellowish white (Fig. 2h). Fore and mid legs grayish brown (Fig. 1i). Apex of hind tarsus sometimes yellowish white (Fig. 1 i–j). Fore wing lacking dark marks, with only an infuscate apical area (Fig. 4h).

Male (n = 19; genitalia, n = 2)

Similar to female (Fig. 1j). Vertex 0.4–0.5 times as long as maximum length of eye in dorsal view. Face 0.7–0.8 times as long as wide. Length of malar space 0.9–1.2 times as long as basal mandibular width. Ocello-ocular line/lateral ocellar diameter = 1.2–1.4. Postocellar line/lateral ocellar diameter = 1.0–1.4. Antenna with 33–36 flagellomeres; first flagellomere 1.1–1.4 times as long as second flagellomere. Hind tibia 8.3–9.6 times as long as maximum depth in lateral view. First hind tarsomere 2.4–2.9 times as long as second and 2.2–2.6 times as long as longer hind tibial spur. T1 2.3–3.2 times as long as maximum width. T2 0.7–0.9 times as long as maximum width. Antennal flagellum without a white band. Face, clypeus, basal area of mandible, apices of T1 and T2, and fore and mid legs yellowish white.

Subgenital plate pentagonal with basal angle obtuse (Fig. 8g). Paramere short, basal part strongly projecting towards base of subgenital plate (Fig. 7m). Aedeagus gently curved, its penis valve ca 2.0 times as long as basal apodeme (Fig. 7n).

Distribution

Japan (Honshu and Shikoku).

Bionomics

Host unknown. Adults mainly fly in July and August.