Aridelus rutilipoides, Fujie & Maeto, 2022

Fujie, Shunpei & Maeto, Kaoru, 2022, The genus Aridelus Marshall (Hymenoptera, Braconidae, Euphorinae) from Japan, with description of a new species, ZooKeys 1092, pp. 105-122 : 105

Aridelus rutilipoides sp. nov.

Fig. 7A-I

Type material.

Holotype, ♀, "(JAPAN) Nagano Pref., Ueda City, Sugadaira-kougen, Tsukuba Univ., 36-31N/138-20E, about 1300 m alt., 13 IX 2013 (sweeping), Sou Shimizu leg." (OMNH). Paratypes: 1♀, Hokkaidô Pref., Sapporo City, Teine Ward, Mt. Teine, 18.IX.2013, S. Fujie leg. (OMNH); 1♀, Tochigi Pref., Nikkô, 13.X.1986, M. Miyazaki leg. (NARO); 1♀, Nagano Pref., Shimashima-dani, 1300-1600 m alt., 26.VIII.1978, K. Maetô leg. (NARO); 1♀, Tokushima Pref., Ichiu Vil., Mt. Tsurugi, 15.X.1980, Y. Shôno leg. (NARO).

Etymology.

Named after its similarity to A. rutilipes Papp. The Latin suffix - “oides” taken from Greek means similar but not the same.

Description.

Female holotype (Fig. 7 ). Body length 6.5 mm.

Head (Fig. 7B, C, D, E ). Width of head 2.0 × median length and 1.1 × width of mesonotum. Length of eye 1.2 × length of temple in dorsal view. OOL / OD = 4.1. POL / OD = 1.7. Vertex and temple densely punctate. Occipital carina complete. Frons smooth and shining, with a distinct median carina. Face 1.9 × as wide as high; finely punctate laterally, transversely punctate-rugose medially. Intertentorial distance / tentorio-ocular distance = 1.7. Clypeus finely punctate, slightly concave medially, without apical teeth. Length of malar space 0.60 × eye height. Malar suture indistinct. Antenna filiform with 18 segments; 3rd segment 3.5 × longer than wide and 1.2 × longer than 4th one; penultimate one 1.3 × longer than wide.

Mesosoma (Fig. 7F ). Mesosoma areolate, 1.3 × as long as high. Scutellum without median smooth area.

Wings (Fig. 7G ). Fore wing 5.0 mm in length, 1-R1 / length of pterostigma = 1.3, r / 3-SR = 2.4, m-cu distinctly antefurcal. Hind wing with 1r-m / 2-SC+R = 0.8.

Legs (Fig. 7H ). Hind leg: femur 5.2 × longer than wide, length of femur: tibia: basitarsus = 1: 1.3: 0.6.

Metasoma (Fig. 7I ). Metasoma smooth and polished. First metasomal tergite 5.9 × longer than its apical width. Hypopygium truncated and excised apically. Ovipositor sheath hardly exserted beyond apex of metasoma.

Colour. Black. Antenna basally, mandible medially, palpi, tegula, legs except for telotarsus, metasoma reddish brown; mandible basally and apically, veins, telotarsus dark brown, antenna gradually darkened towards apex; pterostigma pale in basal quarter. Fore wing hyaline with two fuscous band. Hind wing with a fuscous band in apical third.

Variation in females. Body length 5.8-6.5 mm. Length of eye 1.2-1.4 × length of temple in dorsal view; OOL / OD = 3.5-4.1. POL / OD = 1.5-1.9. Face 1.7-1.9 × as wide as high. Intertentorial distance / tentorio-ocular distance = 1.7-1.9. Length of malar space 0.5-0.6 × eye height. Malar suture indistinct or absent. Third antennal segment 3.5-4.0 × longer than wide and 1.2-1.4 × longer than 4th one; penultimate one 1.2-1.3 × longer than wide. Mesosoma length 1.3-1.4 × height. Fore wing 4.8-5.2 mm in length, 1-R1 / length of pterostigma = 1.2-1.5, r / 3-SR = 2.2-3.6. Hind wing with 1r-m / 2-SC+R = 0.8-1.0. Hind leg: femur 4.6-5.2 × longer than wide, length of femur: tibia: basitarsus = 1: 1.3-1.4: 0.6. First metasomal tergite 5.9-6.3 × longer than its apical width.

Male. Unknown.

Distribution.

Japan ( Hokkaidô; Honshû: Nagano Prefecture; Shikoku: Tokushima Prefecture).

Hosts.

Unknown.

Remarks.

This species closely resembles A. rutilipes Papp (Fig. 6 ) but differs in having the stouter penultimate antennal segment (in Aridelus rutilipoides , 1.2-1.3 × longer than wide (Fig. 7E ), in Aridelus rutilipes 1.8 × (Fig. 6C )), the face finely punctate laterally, transversely punctate-rugose medially (finely punctate in Aridelus rutilipes ), the apical hyaline area of the fore wing not reaching the apico-posterior edge (Fig. 7G ) (in Aridelus rutilipes , reaching the apico-posterior edge (Fig. 6A )) and the metasoma reddish brown (Fig. 7A ) (dark brown in Aridelus rutilipes (Fig. 6A )). This species also resembles A. dubius Belokobylskij, but differs in having the antenna gradually darkened towards the apex (Fig. 7A ) (in Aridelus dubius uniformly reddish brown, not darkened towards the apex (Fig. 1A )), the penultimate antennal segment stouter (in Aridelus rutilipoides , 1.2-1.3 × longer than wide (Fig. 7E ), in Aridelus dubius 1.6-1.7 × (Fig. 1E )), the face finely punctate laterally, transversely punctate-rugose medially (finely punctate in Aridelus dubius ), the malar suture indistinct or absent (distinct in Aridelus dubius ) the apical hyaline area of the fore wing comparatively large, almost reaching the apex of the marginal cell (Fig. 7G ) (in Aridelus dubius comparatively small, not reaching the apex of the marginal cell (Fig. 1F )), the vein m-cu of the fore wing antefurcal (Fig. 7G ) (slightly postfurcal to interstitial in Aridelus dubius (Fig. 1F )), and the hind femur slenderer, 4.6-5.2 times as long as wide (Fig. 7H ) (4.1-4.3 times as long as wide in Aridelus dubius (Fig. 1G )). This species is also similar to A. ussuriensis Belokobylskij, 1981 described from the Russian Far East, but differs in having the vertex densely punctate (vertex with distinct transverse striation in Aridelus ussuriensis ), the mesosoma black (mesosoma red except for the prothorax black in Aridelus ussuriensis ) and the metasoma entirely yellowish brown (metasoma black except for the red first metasomal tergite in Aridelus ussuriensis ).

Figures

Figure 1. Aridelus dubius Belokobylskij, 1981, ♀ from Niigata Prefecture, Japan A habitus B head, frontal view C head, dorsal view D basal antennal segments E apical antennal segments F wings G hind femur.

Figure 6. Aridelus rutilipes Papp, 1965, ♀ from Taiwan A habitus B head, dorsal view C apical antennal segments.

Figure 7. Aridelus rutilipoides sp. nov., ♀ holotype A habitus B head, frontal view C head, dorsal view D basal antennal segments E apical antennal segments F mesosoma, dorsal view G wings H hind femur I first metasomal tergite, dorsal view.