Ancyronyx yunju, Bian & Guo & Ji, 2012

Bian, Dongju, Guo, Cheng & Ji, Lanzhu, 2012, Table 7, Zootaxa 3255, pp. 57-61 : 58-61

Ancyronyx yunju sp. nov.

( Figs. 1–11 )

Type materials: Holotype, male: CHINA: Jiangxi Province, Jiujiang City, Yongxiu County, Yunju Mountains , 29°05.646’N 115°34.880’E, 576 m, 12. X. 2011, leg. Bian & Tong; paratypes: 51 exs., the same data as holotype; 1 ex.: male: CHINA: Jiangxi Province, Jiujiang City, Yongxiu County , Yunju Mountains , 29°05.883’N 115°34.362’E, 705 m, 23. IX. 2009, leg. Bian & Tong; 1 ex.: male: CHINA, Jiangxi Province, Yichun City, Yifeng County , Guanshan Natural Reserve , 28°33.022’N 114°33.689’E, 376 m, 27. IX. 2009, leg. Bian & Tong.

Diagnosis. In general habitus and color pattern of legs ( Figs. 1–2 ) this species somewhat resembles A. johanni Jäch, 1994 , but it can be easily distinguished from the latter by (1) its color pattern of elytra (with X-shaped band on basal two thirds and two oblique bands inwards on about distal third); (2) hind angles of pronotum yellowish; (3) sides of median lobe not produced, almost parallel; (4) parameres more slender in ventral view, and elongated subtriangular in lateral view, not emarginated near distal third.

Description. Body length 1.95–2.25 mm (including head). Predominately dark brown to black, the following parts yellowish: anterior margins of clypeus and labrum, mouth parts, antennomeres 1–10, anterior margin and hind angles of pronotum, an X-shaped band on elytra on basal two thirds, two oblique longitudinal bands inwards on about distal third (interstria 5) to subapical part (interstria 2) which connected to X-shaped band anteriorly, prosternum and mesoventrite, medial areas of metaventrite and ventrites I–III, ventrites IV–V, coxae, trochanters, basal 0.75 of femora, distal 0.4 of tibiae, and claws. Habitus and color pattern as in Figs. 1–2 .

Head 0.45–0.52 mm broad (HW), ID 0.25–0.30 mm. Labrum slightly pubescent, frons and clypeus finely punctuate, moderately densely pubescent; frontoclypeal suture almost straight, impressed. Eyes protruding. Antennae with 11 antennomeres, slender, first two and distal three antennomeres distinctly enlarged. Gula microreticulate, gular sutures narrowly separated, inconspicuous.

Pronotum 0.60–0.75 mm long (PL), 0.75–0.85 mm broad (MW), distinctly narrower than elytra, widest at ca. posterior third; anterior attenuate, anterior margin a little arched, anterior transverse groove distinctly and deeply impressed, evenly arcuate, medially extended posteriorly; posterolateral oblique groove shallow or moderately impressed; surface of pronotum granularly punctuate and pubescent. Prosternum and prosternal process transverse, yellowish, punctuate, interstices granulose; posterior margin of prosternal process almost truncate, inconspicuously produced medially.

Scutellum subtriangular, granulose. Elytra elongate, 1.25–1.50 mm long (EL), 0.90–1.10 mm broad (EW), almost parallel-sided in anterior 0.1–0.6, posteriorly convergent to apices, elytral apices conjointly rounded; with ten longitudinal, moderately regular, deeply impressed rows of punctures between suture and lateral margin, punctures large and deeply impressed; interstices and intervals convex, glabrous. Mesoventrite short, transverse, punctuate, distinctly depressed medially for reception of apex of prosternal process. Metaventrite prominent; with a short, longitudinal groove on midline, medioanteriorly almost glabrous, medially impressed, lateral parts covered with large punctures/granules.

Five visible abdominal ventrites covered with short adpressed setae; ventrite I anteriorly covered with extremely large punctures; ventrite V almost covered with plastron, with short adpressed setae emerging from the granules ( Fig. 6 ); punctures of ventrites I–III distinctly larger than those of ventrites IV and V.

Legs distinctly longer than body; pro- and mesocoxae large, drop-shaped; metacoxae slightly protruding; femora distinctly setose, distal 0.25 black; tibiae inconspicuously setose, basal 0.6 black; tarsi dark brown, claws well developed, strongly curved, base of claws with two teeth, distal one much larger than the basal one.

Tergite VIII in male ( Fig. 7 ) broader than long, with a conspicuous median transverse complete ridge separating posterior and anterior portion, basal half with microstrial pattern, apical half with distinct reticulation; sternite VIII in male ( Fig. 8 ) weakly sclerotized, without setae, median strut short, apically rounded; male sternite IX ( Fig. 9 ) apical margin distinctly emarginated, lateroapically with a cluster of setae; paraprocts not reaching apical margin.

Aedeagus ( Figs. 3–5 ). ca. 494 µm long. Median lobe rather long and moderately broad, ending with a small rounded tip curved ventrad (lateral view), with numerous distinct microtube-like structures mainly ending lateroapically; ventral sac slightly plicate and weakly sclerotized, fibula well sclerotized, conspicuous in transillumination; corona well developed. Parameres distinctly shorter than median lobe, slender (ventral view), elongated subtriangular (lateral view), reaching ca. 0.6 of aedeagus. Phallobase asymmetrical, approximately as long as parameres, basal margin slightly emarginate (lateral view).

Female. Ovipositor ( Fig. 10 ) 455 µm. Stylus slender. Coxite short and stout; distal portion less elongate, with some short, peg-like setae, mostly densely set at apex, inner margin distinctly pubescent; basal portion a litter shorter than distal portion, also with short, peg-like setae, most densely set at lateral margin. Valvifer approximately as long as coxite and stylus together, fibula slender, cranially rounded.

Distribution. China: Jiangxi.

Etymology. The species name is a noun in apposition, derived from the type locality “Yunju Mountains”.

Habitat. A small streamlet ( Fig. 11 ), ca. 3–4 m wide, with dense grass and gravel, flowing through secondary forest and tea gardens. Most specimens of the new species were collected along the bank in sand and grass roots.

Figures

FIGURE 11. Habitat of Ancyronyx yunju sp. nov. [photo by Tong]

FIGURES 1–2. Ancyronyx yunju sp. nov., male (holotype). 1) habitus and color pattern; 2) color pattern of elytra. Scale bars = 0.5 mm.

FIGURES 3–10. Ancyronyx yunju sp. nov., 3–9, male (holotype); 10, female (paratype). 3) aedeagus in ventral view; 4) aedeagus in dorsal view; 5) aedeagus in lateral view; 6) ventrite V; 7) tergite VIII; 8) sternite VIII; 9) sternite IX; 10) ovipositor in ventral view. Scale bars: 3–5, 10 = 0.1 mm; 6–9 = 0.2 mm.