Janssoniella rachini Tselikh, 2020

Tselikh, E. V., 2020, Review of the eastern Palaearctic species of Janssoniella (Hymenoptera: Pteromalidae), with descriptions of four new species, Zoosystematica Rossica (China) 29 (2), pp. 301-315 : 313-314

Janssoniella rachini Tselikh , sp. nov.

( Figs 40–48)

Holotype. Female , Japan, “ Ehime Pref., Odamiyama Keikoku (800 m alt.), 27.V.1994, coll. E. Yamamoto, female”, “0000094534 Sys. Ent. Hokkaido Univ. Japan” ( EIHU).

Paratype. 1 female, Russia, Sakhalin Prov., Sokol Vill. , 7–9.VII.2011, coll. D. Rachin ( ZISP) ; 1 female, Japan, “ Chiba Pref., Ichinomiya-Machi , 18.IV.2004, coll. K. Kubo, female”, “0000094533 Sys. Ent. Hokkaido Univ. Japan ” ( EIHU) , “ Janssoniella sp. Kamijo”; 1 male, “ Japan, Kanagava Pref., Yokohama , 14.IV.2001, coll. K. Kubo, male”, “0000094536 Sys. Ent. Hokkaido Univ. Japan ”, “ Janssoniella sp. Kamijo” ( EIHU) .

Description. Female. Body length 6.30– 9.20 mm; fore wing length 4.10–5.60 mm.

Head dark metallic blue-green with diffuse violaceous lustre. Antenna with scape yellowish-brown basally and metallic green apically, pedicel metallic green, flagellum and clava dark brown or black. mesosoma dark metallic green with diffuse coppery lustre. All coxae metallic green, femora yellowish-brown, tibiae and tarsi yellow, last segment of tarsus yellowish-brown. Fore wing with brownish tint, venation brown. Metasoma with Mt2–Mt6 dark metallic green with diffuse coppery lustre, Mt7–Mt8 brown with diffuse coppery or violaceous lustre; ovipositor sheath black.

Sculpture of head dorsally and malar space finely reticulate, clypeus weakly alutaceous and shining. Pronotum alutaceous and finely reticulate in lateral parts; mesoscutum, axilla, scutellum, frenal area and lateral areas of propodeum finely reticulate. Metasoma weakly alutaceous or smooth and shining.

Head in dorsal view 1.80–1.90 times as broad as long and 1.05–1.10 times as broad as mesoscutum; in frontal view 1.17–1.29 times broader than high. POL 1.10–1.30 times OOL. Eye height 1.40–1.43 times eye length and 2.13–2.25 times as long as malar space. Distance between antennal toruli and lower margin of clypeus 0.75–0.86 times distance between antennal toruli and medi- an ocellus. Antenna with scape 0.65–0.70 times as long as eye height and as long as eye length; pedicel 1.35–1.60 times as long as broad and 0.33 times as long as F1; combined length of pedicel and flagellum 1.60–1.70 times breadth of head; flagellum almost filiform; all anelli transverse; F1 2.35–2.65 times as long as broad, with four–five rows of dense sensilla; F2–F6 longer than broad.

Mesosoma 1.87–2.00 times as long as broad. Scutellum 1.2–1.23 times as long as broad. Propodeum medially 0.20–0.27 times as long as scutellum; median carina complete and straight; nucha absent.

Fore wing 2.80–2.85 times as long as maximum width; basal cell pilose apically; speculum closed; costal cell with three–four complete rows of setae; marginal vein 0.63–0.67 times as long as postmarginal vein and 1.66–1.78 times as long as stigmal vein.

Metasoma lanceolate, 2.15–2.25 times as long as mesosoma and 1.70–1.80 times as long as mesosoma and head; Mt8 2.60–3.80 times longer than maximum width; ovipositor sheath 0.4 times length of Mt8.

Male. Body length 5.00 mm; fore wing length 4.00 mm.

Antenna with scape and pedicel metallic green. Fore femur metallic green, mid and hind femur brown. Metasoma with Mt2 dark metallic green, Mt3–Mt8 brown with diffuse coppery and violaceous lustre.

Eye height 2.83 times as long as malar space. Pedicel 1.20 times as long as broad and 0.30 times as long as F1; combined length of pedicel and flagellum 1.94 times breadth of head. Propodeum medially 0.35 times as long as scutellum. Fore wing 2.50 times as long as maximum width; basal cell pilose. Metasoma lanceolate, 1.20 times as long as mesosoma and 0.89 times as long as mesosoma and head.

Otherwise similar to female.

Comparative diagnosis. This species is similar to J. magna in having the antennal clava darker, dark brown or black, basal cell pilose apically, sculpture of frenal area and lateral areas of propodeum finely reticulate, Mt2 and Mt3 dark metallic green. However, J. rachini has the eye height 2.13– 2.25 times as long as malar space (vs 3.00–3.10 times), antennal scape yellowish-brown basally and metallic green apically (vs entirely yellowish-brown), F1 2.35–2.65 times as long as broad (vs 3.55–3.66 times), metasoma 2.15–2.25 times as long as mesosoma (vs 2.70–2.80 times), Mt8 2.60–3.80 times longer than maximum width (vs 4.60–5.60 times), all coxae metallic green (vs fore and hind coxae metallic green basally and yellowish-brown apically, mid coxa yellowish-brown). Janssoniella rachini is also similar to the Europe- an J. ambigua in having the combined length of pedicel and flagellum about 1.60 times breadth of head, and a short propodeum which is medially 0.20–0.30 times as long as scutellum. However, J. rachini has the basal cell pilose apically (vs bare), F1 with four–five rows of dense sensilla (vs two), and the head in dorsal view shallowly emarginate (vs distinctly emarginate). Janssoniella ambigua has the basal cell bare, F1 with two rows of dense sensilla, head in dorsal view distinctly emarginate ( Graham, 1969).

Etymology. Named in honour of the collector of numerous hymenopterous insects, including a paratype of this species, Daniil V. Rachin.

Distribution. Russian Far East, Japan.

Biology. Unknown.

Remarks. The specimen from Sakhalin Prov. was previously misidentified as J. ambigua Graham, 1969 ( Tselikh, 2016).

Key to the eastern Palaearctic species of Janssoniella (females)

1. Fore wing hyaline ( Figs 13, 21). Body length 2.10– 4.60 mm ..................................... 2

– Fore wing with brownish tint or at least with fuscous cloud below stigma ( Figs 4, 28, 35, 43). Body length 4.60–9.20 mm ......................... 3

2. Basal cell of fore wing bare or with three setae; costal cell with one complete row of setae ( Fig. 13). F1 with two rows of dense sensilla ( Fig. 10). Head in dorsal view distinctly emarginate ( Fig. 12)......................... Janssoniella caudata Kerrich

– Basal cell of fore wing pilose apically; costal cell with two complete rows of setae ( Fig. 21). F1 with three rows of dense sensilla ( Fig. 17). Head in dorsal view shallowly emarginate ( Fig. 19)................... Janssoniella kawabatai Tselikh sp. nov.

3. Fore wing with light brownish tint and with fuscous cloud below stigma (Fig. 35). Propodeum medially 0,38–0.40 times as long as scutellum (Fig. 34). Metasoma with Mt8 1.76–1.85 times longer than maximum width (Fig. 37)...................................... Janssoniella notata Kamijo

– Fore wing with brownish tint and without fuscous cloud below stigma ( Figs 4, 28, 43). Propodeum medially 0.20–0.30 times as long as scutellum ( Figs 7, 30, 48). Metasoma with Mt8 2.60–5.60 times longer than maximum width ( Figs 6, 46)........ 4

4. Antennal clava yellow ( Fig. 1). Basal cell of fore wing entirely pilose ( Fig. 4). Sculpture of frenal area irregularly reticulate, lateral areas of propodeum alutaceous, but part near median carina smooth ( Fig. 7). Mt2 basally metallic green, apically yellowish-brown; Mt3 yellowish-brown ( Figs 5, 8)...... Janssoniella albiclava Tselikh et Lee , sp. nov.

– Antennal clava darker, dark brown or black ( Figs 25, 40). Basal cell pilose apically ( Figs 28, 43). Sculpture of frenal area and lateral areas of propodeum finely reticulate ( Figs 30, 48). Mt2 and Mt3 dark metallic green ( Figs 29, 31, 45, 47)... 5

5. Eye height 3.00–3.10 times as long as malar space. Antennal scape entirely yellowish-brown ( Figs 26, 29). F1 3.55–3.66 times as long as broad ( Fig. 25). Metasoma 2.70–2.80 times longer than mesosoma. Mt8 4.60–5.60 times longer than maximum width. Fore and hind coxae metallic green basally and yellowish-brown apically, mid coxa yellowish-brown ( Fig. 31)............................................ Janssoniella magna Tselikh et Lee , sp. nov.

– Eye height 2.13–2.25 times as long as malar space. Antennal scape yellowish-brown basally and metallic green apically ( Fig. 41). F1 2.35–2.65 times as long as broad ( Fig. 40). Metasoma 2.15–2.25 times as long as mesosoma. Mt8 2.60–3.80 times longer than maximum width ( Fig. 46). All coxae metallic green........ Janssoniella rachini Tselikh , sp. nov.