Spilopteron brachyurum sp. nov.

urn:lsid:zoobank.org:act: FDA2ACF6-526E-479C-BF27-0B0B8DB1B0C9

Figs 1 c–d, 2c, 3c, 4c, 5c, 6c, 7e–f, 8c

Etymology

The specific epithet of this new species is derived from the short ovipositor sheath.

Type material

Holotype

JAPAN: ♀, “Mt. tarumae-san, Hokkaido, Japan, 12–18 July 1998, K. Konishi leg. (MsT)” (NIAES).

Paratypes

JAPAN: 2 ♂♂, same data as holotype (NSMT); 2 ♂♂, same locality, Malaise trap, 18–21 Jul. 1998, K. Konishi (NIAES); 1 ♀, 2 ♂♂, same locality, Malaise trap, 21–26 Jul. 1998, K. Konishi (NIAES); 1 ♂, Mt Teinekanayama, Sapporo-shi, Hokkaido, 19 Jul. 2012, M. Ito (LC154925 OMNH); 1 ♂, Nanamagari, Aomori-shi, Aomori Pref., 25 Jul.–1 Aug. 1992, T. Ichita (NIAES).

Differential diagnosis

This new species most resembles S. albiventre sp. nov. and S. pyrrhonae, but it is easily distinguished from both by the rounded area superomedia on the propodeum (the area is square in S. albiventre and S. pyrrhonae).

Description

Female (n = 2)

BODY LENGTH. 6.5–8.0 mm

HEAD. Vertex 0.4–0.6 times as long as maximum length of eye in dorsal view. Frons without a depression between eye and antennal socket in frontal view (Fig. 2c). Clypeus 0.4–0.5 times as long as wide, with a median projection (Figs 2c, 3c). Face 0.6 times as long as wide. Length of malar space 0.9–1.0 times as long as basal mandibular width. Ocello-ocular line/lateral ocellar diameter = 1.2–1.5. Postocellar line/ lateral ocellar diameter = 1.0. Antenna with 29 flagellomeres; first flagellomere 1.2–1.3 times as long as second flagellomere.

MESOSOMA. Propleuron densely punctate (Fig. 5c). Lateral area of pronotum densely punctate and transversely striate medially. Collar weakly punctate. Mesoscutum densely punctate (Fig. 5c). Subalar prominence sparsely punctate (Fig. 5c). Scutellum densely punctate in dorsal view. Postscutellum flattened in lateral view (Fig. 5c). Metapleuron sparsely punctate (Fig. 5c). Propodeum strongly carinate (Fig. 6c). Area superomedia rounded. Area externa weakly punctate (Fig. 6c). Area basalis, area superomedia and area dentipara polished (Fig. 6c). Area posteroexterna confluent with area petiolaris and polished (Fig. 6c). Fore wing length 6.5–8.0 mm. Vein cu-a basad of vein Rs&M (Fig. 4c). Vein rs-m opposite or basad of vein 2m-cu (Fig. 4c). Hind femur 3.1–3.6 times as long as maximum depth in lateral view, without distinct convexity ventrally. Hind tibia 9.0 times as long as maximum depth in lateral view. First hind tarsomere 2.6–2.8 times as long as second and 2.8–3.0 times as long as longer hind tibial spur.

METASOMA. T1 1.9–2.2 times as long as maximum width, 2.3–2.4 times as long as T2. T2 0.5–0.6 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 1.9 times as long as hind tibia.

COLOR. Body black (Fig. 1c). Antennal flagellum with a white band (Fig. 1c). Inner margin of eye yellowish white (Fig. 2c). Basal area of mandible, face, clypeus, and fore and mid legs brown. Fore wing with a weakly infuscate apical area, extending downwards (Fig. 4c).

Male (n = 8; genitalia, n = 2)

Similar to female (Fig. 1d). Body length 7.5–9.0 mm. Face 0.6–0.7 times as long as wide. Length of malar space 0.8–0.9 times as long as basal mandibular width. Ocello-ocular line/lateral ocellar diameter = 1.2–1.6. Postocellar line/lateral ocellar diameter = 0.8–1.2. Antenna with 35–38 flagellomeres; first flagellomere 1.0–1.3 times as long as second flagellomere. Fore wing: length 7.5–9.0 mm. Hind tibia 9.6–10.7 times as long as maximum depth in lateral view. First hind tarsomere 2.0–2.5 times as long as second and 2.5–2.6 times as long as longer hind tibial spur. T1 2.1–2.5 times as long as maximum width, 2.0–2.1 times as long as T2. T2 0.6–0.8 times as long as maximum width. Face, clypeus, basal area of mandible, hind tarsus and apices of T1 and T2 yellowish white. Fore and mid legs yellowish white with brown markings. Apex of hind tarsus yellowish white (Fig. 1d).

Subgenital plate pentagonal with obtuse basal angle (Fig. 8c), its length ca 0.7 times as long as aedeagus. Paramere short, basal part strongly projecting towards base of subgenital plate (Fig. 7e). Aedeagus gently curved, its penis valve ca 2.0 times as long as basal apodeme (Fig. 7f).

Distribution

Japan (Hokkaido and Honshu).

Bionomics

Host unknown. Adults mainly fly in July.