Siobla acutitheca Niu &Wei 2010
Creators: name: Niu, Gengyun
name: Wei, Meicai
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Tenthredinidae
Siobla
Siobla acutitheca

description: Siobla acutitheca Niu &Wei, 2010
(Figs 1 a, 1b, 4a, 4b, 6e–i, 9a, 9n, 10a, 10b)
Siobla acutitheca Niu & Wei, 2010b: 911. ♀, type locality: Songxian, Henan (China).
Description. Holotype: ♀. Length, 12 mm (Figs 1 a, 4a). Body black; clypeus yellowish white, palpi, dorsum of 1st antennomere, apical 0.8 of 2nd antennomere, entire flagellum, posterior margin of pronotum (greatest width 0.9 × length of lateral ocellus), tegula, posterior ridges of both mesoparapsides and metaparapsides, entire 2nd abdominal tergite, most of 3rd abdominal tergite, and 2nd to 5th sternites entirely yellowish brown, middle of 10th abdominal tergite, cerci and a spot on apex of sheath pale brown. Legs yellowish brown, most of fore coxa, basal 0.3–0.5 of middle and of hind coxa, apical 0.3–0.5 of hind femur, and apical 0.3 of hind tibia black. Hairs silver brown. Wings hyaline, apical 0.3 of fore wing and apical 0.25 of hind wing slightly infuscated, most of pterostigma, base of Sc+R, base half of 1A and of 2A+3A brown, most of vein C and base of pterostigma dark brown, other veins blackish brown.
Punctures on head coarse and dense, without shiny interspaces, punctures on labrum fine and sparse; punctures on prescutum, most of scutum and anterior slope of mesoscutellum very dense, with narrow shiny interspaces; punctures on lateral parts of mesoscutum sparse, with strong shiny interspaces (Fig. 6 f); punctures on posterior slope of mesoscutellum dense and coarse, without shiny interspaces; posttergite and most of metapostnotum shiny, with microsculpture on margin; parapsis with large and sparse punctures and dense microsculpture; anterior slope of metascutellum impunctate, posterior slope densely and coarsely punctured; punctures on upper and middle of mesepisternum dense and coarse, without interspaces, venter of mesepisternum with fine punctures and broad shiny interspaces; punctures on anepimeron dense, katepimeron with fine and dense microsculpture, posterior margin shiny; upper of metepisternum with obscure punctures and narrow interspaces, feebly shiny; venter of metepisternum with very sparse punctures, strongly shiny; depressed center and posterior corner of metepimeron shiny, upper margin with dense and large punctures. First abdominal tergite with extremely weak microsculpture, strongly shiny, lateral c with obscure punctures; other tergites densely microsculptured, feebly shiny; lateral edges of 3rd tergite, lateral edges and posterior margin of 4th tergite, and 5th to 8th tergites distinctly punctured (Fig. 6 e).
Hairs on dorsum of head straight, 1.2 × as long as diameter of lateral ocelli. Anterior margin of clypeus truncate, middle of clypeus without carinae; malar space 0.9 × transverse diameter of median ocellus; shortest distance between eyes below antennal sockets in front view as long as eye height; middle fovea shallow, lateral fovea small but deep; interocellar furrow narrow and deep, postocellar furrow broad and shallow; postocellar area 1.3 × as broad as long, elevated with an obscure middle ridge (Fig. 6 f); lateral furrows shallow and fine, straight, slightly divergent posteriorly; head behind eyes 0.8 × length of eye in dorsal view; curved laterally and then convergent posteriorly. Antenna as long as head, thorax and 1st abdominal tergite together, slightly shorter than vein C, 2nd antennomere 1.4 × as long as broad, relative length of 3rd to 4th antennomeres as 1.7, 4th to 8th antennomeres weakly compressed, inner and outer sides of 6th to 8th antennomeres with weak furrows, 7th antennomere 2.0 × as long as broad. Middle furrow of prescutum distinct (Fig. 6 h); mesoscutellum distinctly elevated, obviously higher than scutum. Metabasitarsus 4.5 × as long as broad, about 1.3 × length of following 3 tarsomeres combined, hind inner tibial spur 0.5 × length of metabasitarsus. Pulvilli of hind tarsus weakly developed, 1st pulvillus 0.9 × basal breadth and 0.6 × apical breadth of metabasitarsus, distance between basal two pulvilli 1.7 × length of 2nd pulvillus. Ovipositor sheath as long as middle tibia in lateral view, distinctly tapering toward apex, ventral margin clearly curved; exposed part of apical sheath hardly narrower than apical breadth of hind tibia and about 1.2 × as long as broad, apical sheath 1.5 × as long as basal sheath (Fig. 6 i). Lancet with 16 serrulae (Fig. 9 a), 10th serrula with 3 large distal teeth, teeth of each serrula not in same level and direction, ventral margin of lancet between serrulae strongly concave, middle serrulae each with 3–4 distal fine teeth (Fig. 9 n).
Male. Length, 11.5 mm (Figs 1 b, 4b). Body black; 2nd to 4th abdominal tergites and 2nd to 5th abdominal sternites yellowish brown; legs yellowish brown, most of each coxa, apical 0.3 of and long stripe on dorsum of hind femur, and apical 0.3 of hind tibia black; punctures and structures like female, but malar space 0.4 ×transverse diameter of median ocellus; shortest distance between eyes below antennal sockets in front view 0.8 × eye height; head behind eyes much shorter than eyes in dorsal view, curved laterally and then distinctly convergent posteriorly (Fig. 6 g); genitalia as in Figs 10 a, 10b.
Variation. Females 11.5–12 mm, males 9.5–11.5mm. Black parts of hind coxa and of hind femur vary in size.
Specimens examined. 8♀, 5♂. Henan: 1♀, “Baiyunshan, Songxian, Henan, 2011-VI-4, 1300m, Zhong Yihai leg.”; [red] ” Holotype ”; “CSCSHT 00810019” (CSCS); Hubei: 1♀, Pingqiangangou, Shennongjia, E.110º07.836´, N.31º27.793´, 1604m, 2008-VI-11, 2008-VI-12, Zhao Fu leg.; 1♀, CSCS11021, Guitouwan, Shennongjia, Yichang, E.110º08.872′, N.31º28.439′, 2150m, 2011. V.19, Li Zejian leg.; 1♂, CSCS11022, Guitouwan, Shennongjia, Yichang, E.110º08.872′, N.31º28.439′, 2150m, 2011. V.25-28, Li Zejian leg.; Gansu: 1♀, Taiyangshan, (Tianshui), 2008-VI-13, Du Weiming leg.; Shaanxi: 1♀, Zhouzhi, 2009-VI-30, Wang Peixin leg.; 1♀, Zhouzhi, 2009-VI-23, Wang Peixin; 1♂, Zhouzhi, 2009-V-12, Wang Peixin leg.; 1♂, Zhouzhi, 2009-V-19, Wang Peixin leg.; 1♀,, Kaitianguan 2000m, 34 00N 107 51E, Mt. Taibaishan, Qinling Mts., 6. VI. 2006, A. Shinohara leg.; NSMT-HYM, 63349 (NSMT); 2♂, same data but NSMT-HYM, 63363, 63366(NSMT).
Distribution. China (Henan, Shaanxi, Gansu, Hubei).
Remarks. The species is similar to S. pseudoplesia Niu & Wei, 2012 but differs from it in the ovipositor sheath about as long as middle tibia, the middle breadth of apical sheath in lateral view about as broad as apex of hind tibia; the serrulae distinctly sclerotized and strongly protruding, the 10th serrula with 3 large teeth; the postocellar area 1.3 × as broad as long; the interspaces between punctures on mesonotum polished, shiny; the abdominal tergite 1 polished, tergites 2–9 distinctly microsculptured; and the first pulvillus longer than half apical breadth of metabasitarsus.
This species is here redescribed based on the holotype. Except for the holotype, all the original paratypes of S. acutitheca Niu &Wei belong to S. pseudoplesia Niu & Wei, 2012.
description: Published as part of Niu, Gengyun & Wei, Meicai, 2013, Revision of the Siobla formosana group (Hymenoptera: Tenthredinidae), pp. 41-68 in Zootaxa 3746 (1) on pages 43-45, DOI: 10.11646/zootaxa.3746.1.2, http://zenodo.org/record/285307