Siobla metallica Takeuchi 1929

Niu, Gengyun, Wei, Meicai & Taeger, Andreas, 2012, Revision of the Siobla metallica group (Hymenoptera: Tenthredinidae), Zootaxa 3196, pp. 1-49 : 14

publication ID	https://doi.org/ 10.5281/zenodo.280105
DOI	https://doi.org/10.5281/zenodo.6181982
persistent identifier	https://treatment.plazi.org/id/8E2787CF-B872-FF87-FF13-02EF5B123DC6
treatment provided by	Plazi
scientific name	Siobla metallica Takeuchi 1929
status

Treatment

( Figs 3 View FIGURE 3 c, 3d, 6h, 6i, 9c, 13f, 14c, 15c, 20d–i)

Siobla metallica Takeuchi, 1929: 495 . Ƥ, type locality: Mt. Jonen, Nagano-ken ( Japan).

ReDescription. Ƥ. Length, 14–15 mm ( Figs 3 View FIGURE 3 c, 6h).Body metallic blue; labrum purple, palpi dirty brown, anterior of fore femur and of fore tibia, fore tarsus, apical 1/3 of anterior of middle femur, and lateral of 2nd abdominal tergite yellowish brown. Forewing sub-infumate hyaline, cell C dark brown, stigma and veins black brown; hind wing grayish hyaline. Hairs on dorsum of head and thorax dark brown, hairs on lateral sides of thorax silver.

Head including temple and postocellar area coarsely and densely punctured, interspaces indistinct ( Fig. 20 View FIGURE 20 d); mesonotum densely punctured, anterior of mesoscutum sparsely punctured; posttergite finely microsculptured; mesepisternum coarsely punctured in upper half and sparsely punctured in ventral half; mesepimeron shiny in anterior and upper margin, densely and finely microsculptured in middle; upper of metepisternum densely and minutely punctured, other parts shiny; metepimeron shiny in middle and posterior corner, densely and coarsely punctured in dorsum, other parts finely microsculptured; 1st abdominal tergite shiny, but finely punctured in lateral, other tergites densely and transversely microsculptured, apex of abdomen and apical sheath finely microsculptured, shiny.

Hairs on dorsum of head straight, slightly longer than diameter of median ocellus, apices slightly curved; hairs on dorsum of mesoscutellum slightly longer than diameter of median ocellus. Anterior margin of clypeus truncate; shortest distance between eyes below antennal sockets in front view as long as eye height; malar space 0.9 × transverse diameter of median ocellus; supraantennal tubercle weakly and obtusely elevated; middle fovea shallow, smaller than frontal basin; lateral fovea small but deep; interocellar furrow broad and deep, postocellar furrow narrow and deep; postocellar area 1.3 × as broad as long, central part elevated with a distinct middle ridge ( Fig. 20 View FIGURE 20 e); lateral furrows deep, curved and slightly divergent posteriorly; temple 0.6 × length of eye in dorsal view; lateral sides distinctly convergent posteriorly. Antenna 1.3 × as long as head and thorax together, equal to length of abdomen. Mesoscutellum obtusely elevated, without peak or middle carina ( Fig. 20 View FIGURE 20 f); mesepisternum with an obscure middle ridge, ventral thorn absent. Metabasitarsus 4.5 × as long as broad, about 0.8 × length of following 4 tarsomeres combined, hind inner tibial spur 0.5 × length of metabasitarsus. Hind wing with petiole of anal cell shorter than half length of cu-a. Ovipositor sheath 0.8 × length of middle tibia. Lancet short, with 14 serrulae, annular sutures distinct in ventral half ( Fig. 9 View FIGURE 9 c), middle serrulae each with 9–10 distal fine teeth ( Fig. 13 View FIGURE 13 f).

Male: Length, 13–14 mm ( Figs 3 View FIGURE 3 d, 6i). Similar to female in color and general appearance except for hairs on dorsum of head 1.3 × diameter of median ocellus, apices obviously curved ( Figs 20 View FIGURE 20 h, 20i); hairs on dorsum of thorax dark brown; fore and middle legs with anterior of femur and tibia and most of tarsus pale brown; shortest distance between eyes below antennal sockets in front view 0.8 × eye height; malar space linear; temple 0.4 × length of eye in dorsal view ( Fig. 20 View FIGURE 20 g); subgenital plate as long as broad, posterior margin round, gonoforcep as Fig. 14 View FIGURE 14 c; penis valve as Fig. 15 View FIGURE 15 c.

Variation. Pale spot on lateral sides of abdomen in one male (coll. SDEI) small, posterior reaching spiracle.

Specimens examined. Japan: Honshu: 1Ƥ, [ JAPAN: Honshu], Makuiwa, 1550 m, Shiga–kogen, Nagano Pref. 24. VII. 1998, A. Shinohara; [Blue:] For exchange; 13, [ JAPAN: Honshu], Kiyosato, Yatsugatake Mts., Yamanashi Pref. 1719. VI. 1999, A. Shinohara; [Blue:] For exchange; 1Ƥ, Mt. Tateshinayama, Kasuga Bokujyo, (Nagano), vii.1.1971, R. & F. Ishikawa; MSNT-I-Hym, No. 7873 (NSMT); 233, Take, foot of Mt. Hayachine, [Iwate], vii. 13, 1967, Ig. R. Ishikawa; MSNT-I-Hym, No. 256–257 (NSMT); 1Ƥ, 19; col. H. Kumamoto; Siobla metallica , det. H. Kumamoto; Todaigawa (Minami–Alps), 20.vi.1981. (SDEI); 13, 18; col. H. Kumamoto; Siobla metallica , det. H. Kumamoto; Oomi–Takayama (Shiga), 19.vi.1982 (SDEI).

Distribution. Japan (Honshu, Shikoku).

Remarks. S. metallica is similar to S. reticulatia Wei, 1998 . See the above key for the differences between the two species. S. metallica is also similar to S. shennongjiana , and S. obtusiscutellata see remarks there.

S. metallica was described by Takeuchi (1929) based on a single female from Japan. Togashi (1970) studied the internal reproductive organs of both female and male. Naito (1982) reported that its chromosome number is 9. Takeuchi (1955) provided a color photograph of a male and reported that it is distributed in Shikoku and Honshu and occurs in June and July. Togashi (1998) reported it from Fukushima Prefecture. Naito (2004) provided a color photograph of a female and presented its distribution data in Hyogo Prefecture.