Neotrionymus chinensis, Xu & San & Wu, 2018

Xu, Shujing, San & Wu, an, 2018, The Chinese species of the mealybug genus Neotrionymus Borchsenius (Hemiptera: Coccoidea: Pseudococcidae), Zoological Systematics 43 (1), pp. 52-57 : 53-54

Neotrionymus chinensis sp. nov. ( Fig. 1 )

Material examined. Holotype ♀, China, Shanxi, Jincheng, Lingchuan, Chongan Park (35°46′N, 113°16′E), under the leaf sheath of grasses ( Poaceae ), 24 September 2016, Xubo Wang & Ming Zhao leg. Paratypes. 25♀, same data as holotype ; 1♀, Beijing, Songshan Natrue Reserve (40°29′N, 115°48′E), under the leaf sheath of grasses ( Poaceae ), 27 June 2015, Shujing Xu & Xuelian Wang leg. ; 29♀, Shandong, Zibo, Boshan, Yuanshan Forest Park (36°28′N, 117°49′E), under the leaf sheath of grasses ( Poaceae ), 18 July 2015, Shujing Xu & Xuelian Wang leg.

Adult female. In life, the body elongate oval, reddish in colour, covered with thin white mealy wax.

Body on microscopic slide elongate oval, sides subparallel, 2.2–3.7 mm long, 0.8–1.7 mm wide. Anal lobes moderately developed, each with ventral surface membranous, bearing an apical seta 150.0–187.5 μm long. Antennae each normally with 7, occasionally with 8 segments, 248–320 μm long. Eye spot present, located at body margin behind antennae. Legs developed; claw slender, curved at tip, without a denticle; both tarsal digitules and claw digitules knobbed, longer than claw. Hind coxa 62.5–112.5 μm long, hind trochanter + femur 180–250μm long, hind tibia + tarsus 175–262.5 μm long; claw 16.5– 26.5 μm long; ratio of lengths of hind tibia + tarsus to hind trochanter + femur 0.89–1.14; ratio of lengths of hind tibia to tarsus 1.61–2.04; translucent pores present on anterior and posterior surface of hind coxa, a few also occurring on apical part of hind tibia. Circulus large, always longer than width, 75–132.5 μm long, 50–100μm wide, usually slightly notched on each side, not so obvious, sometimes divided by an intersegmental line, quadrate or sometimes hour-glass shaped. Clypeolabral shield about 130–155 μm long. Labium with 3 segments, about 80–97.5 μm long. Ratio of lengths of labium to clypeolabral shield 0.55–0.67. Spiracles surrounded by slightly sclerotized areas. Ostioles represented by anterior and posterior pairs, with inner edges of lips slightly sclerotized; lower lips of posterior pair normally without trilocular pores and setae, anterior lips of posterior pair bearing 3–8 trilocular pores, sometimes 1–3 setae, occasionally 1–2 multilocular disc pores or tubular ducts present; each lip of anterior pair with 0–3 trilocular pores, 1–2 setae sometimes present on lower lips. Anal ring 67.5– 85 μm in diameter, with 2 rows of cells on anterior half and 2 or 3 rows on posterior half; bearing 6 setae, each seta 112.5– 180 μm long. Only one pair of cerarius on anal lobes present, each containing 2 slender conical setae (each seta about 12–20 μm long), 0–4 trilocular pores, occasionally 1 auxiliary setae or 1 multilocular disc pores or 1–2 tubular ducts, situated on a membranous to lightly sclerotized area.

Dorsum. Setae slender and flagellate, mostly each 10–25μm long, some on abdominal segment VII each about 40–45 μm long. Multilocular disc pores each about 6 μm in diameter, present across segments, mainly at anterior edges and some at middle and posterior edges of abdominal segments, and evenly distributed on head and thorax. Trilocular pores present on lips of ostioles and sometimes in cerarii. Oral collar tubular ducts, each about 4.5 μm long, 2.2 μm wide, distributed across segments, mainly near posterior edges and some at middle and anterior edges of abdominal segments, becoming scattered on head and thorax, varying in number.

Venter. Setae normal, flagellate, mostly each about 10–55 μm long, a few on head sometimes each as long as 65–90μm long. Multilocular disc pores same as those on dorsum, distributed in transverse rows near anterior and posterior edges of abdominal segments IV–VII, elsewhere they evenly distributed. Trilocular pores present near spiracles. Oral collar tubular ducts same as those on dorsum, mainly distributed in groups around lateral margins and in transverse rows at posterior edges of abdominal segments IV–VIII, also sparsely at anterior segments of abdomen, thorax and head.

Remarks. In the general distribution of multilocular disc pores and the type of tubular ducts, this species comes close to N. kerzhneri Danzig, 1972 , but differs in: 1) the form of the circulus which is quite large, longer than width, quadrate or hour-glass shaped, whereas the circulus of the latter is small and round; 2) the presence of tubular ducts in median area of thorax on dorsum and venter; 3) the presence of translucent pores on apical part of hind tibia; (4) the distribution of trilocular pores not only in cerarii, but also on lips of ostioles and near spiracles.

Distribution. China (Beijing, Shandong, Shanxi).

Etymology. The specific epithet refers to the distribution of this species.

Figures

Figure 1. Adult female of Neotrionymus chinensis sp. nov. A. Trilocular pore. B. Oral collar tubular duct. C. Multilocular disc pore. D. Cerarius on anal lobe. E. Claw.