Siobla leucotarsis Niu & Wei

Niu, Gengyun, Wei, Meicai & Taeger, Andreas, 2012, Revision of the Siobla metallica group (Hymenoptera: Tenthredinidae), Zootaxa 3196, pp. 1-49 : 11-12

publication ID	https://doi.org/ 10.5281/zenodo.280105
DOI	https://doi.org/10.5281/zenodo.6181976
persistent identifier	https://treatment.plazi.org/id/8E2787CF-B875-FF81-FF13-00145EE0380F
treatment provided by	Plazi
scientific name	Siobla leucotarsis Niu & Wei
status	sp. nov.

Treatment

Siobla leucotarsis Niu & Wei , sp. nov.

( Figs 2 View FIGURE 2 a, 2b, 5i, 5j, 8c, 12c, 14k, 15k, 18a–f)

urn:lsid:zoobank.org:act:CD93F600-7E73-410D-A370-CDBA1B5AEE76

Description. Holotype: Ƥ. Length, 13 mm ( Figs 2 View FIGURE 2 a, 5i). Body strong metallic blue; labrum, basal 1/3 of each tibia, bases of fore and middle basitarsi, other tarsomeres of fore and middle legs, 2nd to 5th hind tarsomeres, apical 4 antennomeres yellowish white; anterior of fore femur pale brown, hind trochanter yellowish brown, each apex of 1st to 4th fore tarsomeres, apical 2/3 of middle 1st tarsomere, each apex of 2nd to 4th middle tarsomeres, and each apex of hind 2nd to 5th tarsomeres blackish brown; apical 2/3 of hind tibia and entire basitarsus bluish purple; apical margin of sheath pale brown. Wings infuscated, apical 1/4 of forewing smoky, cell C pale, stigma and veins blackish brown. Hairs on dorsum dark brown, hairs on pleuron pale brown.

Punctures on clypeus, frons and postocellar area dense and coarse, punctures on lower half of inner orbit fine and dense, upper 1/3 of inner orbit and temple with fine and very sparse punctures, interspaces broad and shiny ( Fig. 18 View FIGURE 18 a); pronotum densely and coarsely punctured; posterior margin of pronotum and scutum moderately punctured, interspaces shiny; anterior slope of mesoscutellum sparsely punctured; lateral sides and posterior densely and coarsely punctured; punctures on metascutellum dense and coarse; mesepisternum densely and coarsely punctured, mesepimeron microsculptured, dorsum with coarse punctures; metepisternum finely and sparsely punctured, shiny; metepimeron shiny except dorsum densely and coarsely punctured; 1st abdominal tergite shiny except lateral sides sparsely punctured and middle weakly microsculptured, other tergites microsculptured.

Hairs on dorsum of head straight, as long as transverse diameter of median ocellus; hairs on mesoscutellum slightly longer than transverse diameter of median ocellus, hairs on mesepimeron 1.2 × transverse diameter of median ocellus. Anterior margin of clypeus protruding ( Fig. 18 View FIGURE 18 b); malar space equal to transverse diameter of median ocellus; lower interocular distance 1.2 × eye height; anterior margin of supraantennal tubercle elevated; middle fovea nearly round, deep and broad; frontal ridge slightly elevated; interocellar furrow fine and deep, postocellar furrow fine and shallow; postocellar area elevated, as high as top of ocelli, with an obtuse middle carina, 1.6 × as broad as long; lateral furrows shallow, nearly parallel posteriorly; head behind eyes 0.8 × eyes in length in dorsal view, convex in middle and narrowing posteriorly. Occipital groove shallow. Antenna 1.3 × head and thorax combined in length, 0.9 × abdomen length. Mesoscutellum roundly elevated ( Fig. 18 View FIGURE 18 c), without middle carina; metascutellum with an obtuse middle carina; ventral thorn absent. Apex of hind tibia distinctly enlarged; metabasitarsus 3.6 × as long as broad, 0.8 × length of remaining 4 tarsomeres combined; hind inner tibial spur 0.4 × length of metabasitarsus. Hind wing with petiole of anal cell equal to half length of cu-a. Ovipositor sheath 0.9 × middle tibia in length, apical sheath slightly longer than basal sheath; lancet as in Fig. 8 View FIGURE 8 c; apical and 4th to 6th serrulae as in Fig. 12 View FIGURE 12 c.

Male: Length, 12 mm ( Figs 2 View FIGURE 2 b, 5j). Similar to female in structure and color, but most of 2nd to 4th hind tarsomeres blackish blue, venter of apical 4 antennomeres blackish brown, venter of hind 1st trochanter with small black spot; interspaces between punctures on temple broader than diameter of punctures ( Fig. 18 View FIGURE 18 d); malar space 0.7 × transverse diameter of median ocellus; lower interocular distance equal to eye height, clypeus and mesoscutellum as Figs 18 View FIGURE 18 e, 18f; metabasitarsus 3.3 × as long as broad; subgenital plate as long as broad, apex round; genitalia as in Fig. 14 View FIGURE 14 k and Fig. 15 View FIGURE 15 k.

Variation. The basal 1/3 of hind basitarsus white is three females.

Etymology. The specific epithet refers to the partly white tarsi.

Specimens examined. Holotype: Ƥ, Deqin (28º29´N, 98º 54.5´E), Yunnan, alt. 3200 m, 15 July 2004, Xiao Wei leg., CSCSHT 0 0 810037 (CSCS). Paratypes: Yunnan: 3Ƥ 13, Mt. Yulongxue, Lijiang, Yunnan, 27°07.842´N, 100°13.976´E, alt. 2945 m, 6 June 2009, Li Zejian, Wei Meicai, Niu Gengyun leg.; 13, Deqin 6km SE, +28.44400, +98.95100, 3500 m, 19.06.2009, S. M. Blank, A. D. Liston & A. Taeger leg. (SDEI).

Distribution. China (Yunnan).

Remarks. The new species is similar to S. nigricruris , but differs from the latter by the following: anterior margin of clypeus protruding roundly; metabasitarsus 3.6 × as long as broad; the apical 2/3 of each tibia and metabasitarsus entirely bluish purple, the basal 1/3 of each tibia yellowish white, middle and hind tibial spurs blackish brown, abdomen with strong metallic blue luster. In S. nigricruris : anterior margin of clypeus truncate; metabasitarsus 4.2 × as long as broad; fore and middle tibiae yellowish brown, hind tibia blackish brown, middle and hind tibial spurs and basitarsus yellowish brown, abdomen with feeble metallic blue luster. S. leucotarsis is also similar to S. foveata , see remarks there.