Eurytoma truncatumi Yang, Liu & Cao 2023, sp. nov.
Creators: name: Liu, Huihui
name: Cao, Liangming
name: Wang, Xiaoyi
name: Xin, Xuebing
name: Bao, Yingxia
name: Yang, Zhongqi
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Eurytomidae
Eurytoma
Eurytoma truncatumi

description: 3.1 Eurytoma truncatumi Yang, Liu & Cao, sp. nov. (Figs 1–17)   
 Diagnosis. The new species is close to E. acericola Zerova 1975 by their hosts from the same genus Bradybatus, but it is different from the latter by: hind tibia possessing dense bristles on dorsal edge and 5 of them stout and yellowish (vs. without such bristles on hind tibia); the scrobal depression not reaching median ocellus (vs. completely reaching median ocellus); face without radiating striae (vs. face with distinct radiating striae); antennae black in color (vs. antennae yellow in color).   
Description. Female. Length 2.7–3.0 mm (Holotype 2.9 mm).  
Head (Figs 1–5). In dorsal view, head somewhat dumbbell-shaped, 1.8 times as broad as long and 1.26 times as broad as mesosoma; temple about 0.28 times as long as eye; POL 1.75 times of OOL; vertex medially 2/3 as long as laterally and bulged evenly. Vertex, frons, face and genae covered with setiferous umblicate punctures. Head in front view 1.36 times as broad as height, frons 1.75 times as broad as eye height, toruli located slightly above ocular line; scrobal depression deep and narrow, and not reaching median ocellus with distance little more than ocellus diameter, depression base smooth and shining (Fig. 4); 2 scrobes nearly contacted each other; eyes with very sparse short pubescence; malar sulcus curved and 0.72 times of eye height (Fig. 2), between its apical and lower margin of eye with a small fovea, before and behind sulcus with piliferous umblicate punctures and without a narrow smooth shining area (Fig. 2); gena obviously carinated; face and parascrobal area covered dense flattened hairs, but having a narrow smooth longitudinal band extending from lower margins of scrobes to clypeus outer margin; clypeus bidentate apically; mouth part relatively small with breadth 1.2 times as wide as malar sulcus height. Antennal scape extending to top of scrobal depression and just reaching median ocellus, cylindrical in form with length 3.7 times as long as broad, having sparse hairs dorsally; combined length of pedicel plus flagellum 1.13 times of head breadth and 1.22 times of breadth of mesoscutum; pedicel approximately spherical, shining with sparse setae, 1.3 times as long as broad with length 0.75 times of funicle 1; flagellum with 1 anellus, 5 funicle segments and 3-segmented clava; each funicle and clava segment with only one row of multiporous plate sensilla and dense hairs; funicle 1 and 2 somewhat cydariform; relative measurements (length/broadth) of 5 funicle and 3 clava segments as follows: funicle segment fl1 11/7, fl2 11/7, fl3 11/8, fl4 10/8, fl5 10/8, claval segment cl1 8/8, cl2 8/8, cl3 8/7, clava 3 blunt apically (Fig. 5).  
Mesosoma (Figs 1, 3, 6, 8). In dorsal view, mesoscutum convex considerably with dense evenly sized setiferous punctures; pronotum rectangular and 2.0 times as broad as long, hairs in punctures short, mesoscutum 2.0 times as broad as long with length 1.25 times and breadth 1.14 times pronotum; notauli complete; mide lobe approximately triangle with anterior margin breadth 3.0 times posterior margin; scutellum ovoidally convex with length 1.3 times of breadth and about 1.5 times as long as mesoscutum, umblicate punctues greater than on other part of mesosoma; metanotum with distinct drosellum which directly under scutellum and rectangular in form with carinate margin and 2 obllique longitudinal striation in base; propodeum droped steeply from drosellum with a wide median furrow, base of furrow irregularly and coarsely rugosus (Fig. 3), lateral areas evenly bulged moderately, covered with relatively larger umblicate punctures as on scutellum and without ridges; callus with dense hairs; spiracle small and closed to anterior margin, distance from spiracle to margin same as its diameter. In lateral view, prepectus smooth and shining; sabalar area convex and smooth; mesepsternum furrowlike and covered with setiferous punctures, but mesepmeron with dense transverse striations and without any puncture (Fig. 6). Hind leg with coxa dorsally and laterally rugulose (Fig. 6); and having 4 long hairs at inner side, as well as dense long hairs along lower margin; hind femur somewhat swelled medially with length 4.4 times of breadth, its outer side with 3 lines of long hairs and having 2 lines about 30 long hairs along its lower margin; hind tibia cylindrical in form with 2 spurs and nearly as long as femur (40: 38), covering dense bristles, along dorsal edge having a line of long bristles in which 5 bristles stout obviously with color yellowish (Fig. 8).  
Wings (Figs 1, 7). Forewing reaching apex of metasoma, 2.1 times as long as broad, ratio of length of submarginal, marginal, post marginal and stigma veins as 116: 36: 26: 22; stigma shoe-shapped; submarginal vein with about 25 setae; basal cell with about 7 setae, basal cell setal lines present and closed below with hairs. Hind wing 3.5 times as long as broad.  
Metasoma (Figs 1–2). In dorsal view, gaster oval acuminate and laterally compresed, 2.5 times as long as broad, 1.08 times as long as mesosoma, its breadth 0.86 times of mesoscutum and 0.71 time head breadth; tergum 1–5 smooth and shining, without seta except tergum 4 with a transverse medial line of spars setae; tergum 6 and 7 with seruferous umblicate puncture posteriorly; petiole very short with three distinguished horn-like prominents; ovipositor slightly protruded; relative length of tergum 1–7 and ovipositor as 10: 14: 22: 44: 2: 8: 10: 11; tergum 4 largest in all terga. In lateral view, tergum 2–6 with very dense micro-setiferous punctures as belt along lower part, particularly belt on tergum 4 extending upwards anterioly and nearly to dorsum of tergum 4.  
Color. Body black; antenna black except scape having basal 2/3 yellow, and distal scape 1/3, as well pedicel dark brown; eyes caramel red, ocelli brown-yellow; flattened setae on face white; all coxae and most part of femora black, all tibiae dark brown with distal and apical yellow; all tarsi yellow white and claws brown; wings hyaline with veins pale brown-yellow.  
Male (Figs 9–17). Body 2.1–2.3 mm in length, similar to female. Relative length of head, mesosoma, gaster and gaster in lateral view as 15, 49, 15, 36; potiole long with length 3.6 times of breadth and 0.42 times as long as gaster, 1.16 times as long as hind coxa and dorsally coarsely rugose (Figs 14, 17); antenna long, scape 3.0 times as long as broad with a rounded knoblike protuberance near apical which concave medially being spoon-like; pedical small and spherical inform; flagellum with 5 funicle segments and 2 claval segments; funicle segments all having distinguished long whorls of hairs, all funicles longer than wide, dorsally produced and pedicellate; length of pedicle plus flagellum 1.7 times of head breadth (Figs 9–10); relative length/breadth measurement of scape, pedicle, funicle 1, 2, 3, 4, 5 and clava 1, 2 as follows: 28/9, 8/5, 20/9, 20/8, 20/8, 20/8, 15/7, 14/7,14/5; clava blunt apically.  
Variation. Antenna in some specimens with flagellum brown and proximal 3 funicle drum-like in form.  
 Etymology. The specific epithet is derived from the purpleblow maple, Acer truncatum, on which the host of the new species, Bradybatus sp., eats its seeds.   
 Material examined. Holotype ♀, reared from the fresh ripped seeds of Acer truncatum damaged by Bradybatus sp. collected from the Daiqingtala Nature Reserve (代üffiẁ), Horqin Right Middle Banner (Ḣ尔沁右ª中⁂), Xing'an League (兴kDz), Inner Mongolia, China, 28 September 2022. Paratypes. 2♀ 23♂, the same data as holotype; 1♀, the same data as holotype, but emerged on 20 August 2021. 1♀ 1♂, 4 January 2022; 6♀ 2♂, 24 January 2022; 1♀ 1♂, 30 January 2022; 2♀ 1♂, 8 February 2022; 2♀ 1♂, 14 January 2022; 1♀, 24 March 2022; 1♀, 2 April 2022; 3♀ 2♂, 28 May 2022; 4♀ 13♂, 28 April 2023; all above paratypes reared from the last year seeds of Acer truncatum damaged by Bradybatus sp.   
Distribution. China (Inner Mongolia).
description: Published as part of Liu, Huihui, Cao, Liangming, Wang, Xiaoyi, Xin, Xuebing, Bao, Yingxia & Yang, Zhongqi, 2023, Two new species of Eurytoma (Hymenoptera: Eurytomidae), parasitoids of Bradybatus sp. (Coleoptera: Curculionidae) damaging seeds of Acer truncatum in China, pp. 264-276 in Zoological Systematics 48 (3) on pages 265-270, DOI: 10.11865/zs.2023305, http://zenodo.org/record/10941934