Colochela nigrata Wei & Niu

Niu, Gengyun & Wei, Meicai, 2016, Revision of Colochela (Hymenoptera, Tenthredinidae), Zootaxa 4127 (3), pp. 457-470 : 460-461

Colochela nigrata Wei & Niu , sp. nov.

( Figs 1 a–b, 2a, d, g, j, m, 3e, h, 4a, d, g, j, k, 5a, d, e, j–l) urn: lsid:zoobank.org:act:34DA4F27-2B00-4F77-9F34-C4E1B5FFB0E0

Description. Holotype: ♀. Length 14.5 mm ( Fig. 1 a). Body black, body hairs black brown entirely. Wings strongly and evenly infuscate, vein R1 largely brown, pterostigma and other veins black; hind wing slightly paler than forewing.

Clypeus densely punctured except for narrow anterior margin, interspaces between punctures very narrow and smooth, hardly microsculptured; inner orbit, temple and postocellar area minutely and densely punctured, interspaces smooth, weakly shiny; punctures on frons extreme dense and fine, interspaces microsculptured; malar space densely microsculptured; punctures on hind orbit sparse and shallow; punctures on pronotum, mesoscutal middle lobe and lateral lobe, mesoscutellum, upper part of mesopleuron and metapleuron entirely much denser than punctures on head, interspaces hardly recognizable, almost mat; punctures on ventral part of mesepisternum gradually sparser and larger, interspaces hardly microsculptured, weakly shiny; punctures on mesoscutellar appendage sparse and large, surface smooth, shiny; metascutellum sparsely punctured, shiny; abdominal tergites 1– 10 densely and minutely punctured, interspaces strongly microsculptured, matt; narrow intertergites smooth, strongly shiny.

Hairs on dorsum of head and mesopleuron about 0.6 times as long as diameter of median ocellus; hairs on mesonotum extreme dense and about 0.4 times as long as diameter of median ocellus; abdominal tergites densely pubescent, extremely short, about 0.2 times as long as diameter of median ocellus; mesoscutellar appendage and intertergites of abdomen glabrous.

Anterior margin of clypeus weakly incised, almost truncate; malar space 0.3 times as long as diameter of median ocellus; distance between eyes at level of anterior tentorial pits as long as longest axis of eye ( Fig. 2 d); middle fovea small, round and deep, closed; frons flat, frontal ridge indistinct; POL: OOL: OCL = 13: 20: 22; interocellar furrow deep and broad, postocellar furrow shallow, weakly bent forward; postocellar area roundly elevated, about 1.5 times as broad as long; lateral furrow narrow and deep, weakly curved, hardly divergent backward; head slightly narrowed behind eyes in dorsal view ( Fig. 2a ). Antenna 0.8 times as long as head and thorax together, distinctly incrassated beyond middle, 5th –9th antennomeres with indistinct longitudinal furrow in both sides, third antennomere as long as following two antennomeres together, seventh antennomere about 1.5 times as long as broad ( Fig. 3 e). Mesoscutellar appendage flat, with a distinct middle carina; cenchrus roundish, slightly broader than long, CD = 2. Venation as Fig. 1 a, basal anal cross vein present; petiole of hind anal cell about 0.3 times length of cu-a. Ovipositor sheath 1.5 times as long as front tibia, apical sheath as long as basal sheath, tapering toward apex ( Fig. 2 m); sheath and setae in dorsal view as Fig. 2 j, sheath clearly tapering toward apex, about 2 times as broad as breadth of cercus; cercus small, about 2 times as long as broad. Lancet as Fig. 4 a, with about 27 serrulae, apical segment of lancet as Fig. 4 d, middle segments of lancet as Fig. 4 g, annular spines short and sparse, surface sculpture of lancet as Figs 4 j, k.

Male. Body length 13.5 mm ( Fig. 1 b); color, punctation and structure similar to female except for following: malar space 0.2 times as long as diameter of median ocellus ( Fig. 2 g); distance between eyes at level of anterior tentorial pits about 0.9 times as long as longest axis of eye; head distinctly narrowed behind eyes in dorsal view; subgenital plate broader than long, apical margin round; harpes almost as long as broad ( Fig. 5 a); volsella and gonolacinia as Figs 5 d–e; penis valve as Figs 5 j–l.

Variation. The head of one female collected from Shaanxi Province is without lateral furrows.

Etymology. The specific epithet refers to the entirely black body of the new species.

Types: Holotype. ♀, CHINA: ANHUI: Lu’an, Central Forest Park, 75m, 1♀, 28.iv.2015, Genbank accession number KT833356 (CSCS). Paratypes: No data, 1♂, (CSCS); HUBEI: Baoji'an [Wuchang], 11.iv.1954; SHAANXI: Xixiang, 560m, 1♀, 2.v.1988 (CSCS); CHONGQING: 1♀, 20.vi.1997, Wei Meicai (CSCS); ZHEJIANG: 1♂, 6.v.1992, Wu Hong (CSCS).

Other material examined. CHINA: Guangxi: Yangshuo, 1♀, 3.iv.1938 ( IZAS).

Distribution. China (Shaanxi, Anhui, Hubei, Zhejiang, Chongqing, Guangxi) ( Fig. 6 ).

Remarks. See the above key for the differences between C. nigrata and the other two species of the genus. As to the specimen collected from Shaanxi that has the lateral furrows absent, no other distinct difference could be found between the specimen and others.

Figures

FIGURE 1. Colochela species. a. C. nigrata, ♀, holotype; b. C. nigrata, ♂, paratype; c. C. rufidorsata, ♀, holotype; d. Labels of holotype of C. rufidorsata; e. C. rufidorsata, ♂; f. C. zhongi, ♀, holotype; g. C. zhongi, ♂, paratype; h – j. C. zhongi, ♀, paratype; k. Labels of C. zhongi, ♀, paratype. Scale bar = 1 mm (Except for 1 d, and 1 k).

FIGURE 4. Colochela species. a – c. Lancet. a. C. nigrata, ♀, paratype; b. C. rufidorsata, ♀; g. C. zhongi, ♀, holotype; d – f. Apical serrulae. a. C. nigrata, ♀, paratype; b. C. rufidorsata, ♀; g. C. zhongi, ♀, holotype; g – i. Middle serrulae. a. C. nigrata, ♀, paratype; b. C. rufidorsata, ♀; g. C. zhongi, ♀, holotype; j – n. Annular spines and surface sculpture of lancet. j – k. C. nigrata, ♀, paratype; l. C. rufidorsata, ♀; m – n. C. zhongi, ♀, holotype. Scale bar = 100 µm.

FIGURE 5. Colochela species. a – c. Gonoforceps. a. C. nigrata, ♂, paratype; b. C. rufidorsata, ♂; c. C. zhongi, ♂, paratype; d – i. Volsella. d – e. C. nigrata, ♂, paratype; f – g. C. rufidorsata, ♂; h – i. C. zhongi, ♂, paratype; j – r. penis valve. j – l. C. nigrata, ♂, paratype; m – o. C. rufidorsata, ♂; p – r. C. zhongi, ♂, paratype. Scale bar = 100 µm.

FIGURE 6. Colochela species, distribution.

FIGURE 2. a – c. Head, dorsal view. a. C. nigrata, ♀, paratype; b. C. rufidorsata, ♀; c. C. zhongi, ♀, paratype; d – f. Head, frontal view. d. C. nigrata, ♀, paratype; e. C. rufidorsata, ♀; f. C. zhongi, ♀, paratype; g – i. Head, lateral view. g. C. nigrata, ♂, paratype; h. C. rufidorsata, ♂; i. C. zhongi, ♂, paratype; j – l. Ovipositor sheath, dorsal view. j. C. nigrata, ♀, paratype; k. C. rufidorsata, ♀; l. C. zhongi, ♀, paratype; m – o. Ovipositor sheath, lateral view. m. C. nigrata, ♀, paratype; n. C. rufidorsata, ♀; o. C. zhongi, ♀, paratype. Scale bar = 1 mm.

FIGURE 3. a. Mandibles. C. zhongi, ♀, paratype; Scale bar = 100 µm; b – c. Palpi. C. zhongi, ♂, paratype; Scale bar = 100 µm; d. Claw. C. zhongi, ♀, paratype; Scale bar = 100 µm; e – f. Antenna. e. C. nigrata, ♀, paratype; f. C. rufidorsata, ♀; g. C. zhongi, ♀, paratype; Scale bar = 1 mm; h – j. Posttergite, cenchri, and abdominal tergites 1 – 2. h. C. nigrata, ♀, paratype; i. C. rufidorsata, ♀; j. C. zhongi, ♀, paratype. Scale bar = 1 mm.