Falsonannocerus haizhuensis Zhu, Wang & Feng, 2021

Zhu, Jiang, Wang, Cheng-Bin & Feng, Bao-Ying, 2021, Taxonomical study on the newly-recorded genus Falsonnannocerus Pic from China (Coleoptera, Tenebrionidae, Stenochiinae), Biodiversity Data Journal 9, pp. 73232-73232 : 73232

Falsonannocerus haizhuensis Zhu, Wang & Feng sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Jiang Zhu & Wen-Ting Chen; individualCount: 1; sex: female; Location: country: China; stateProvince: Guangdong; verbatimLocality: Guangzhou, Haizhu National Wetland Park [海珠国家湿地公园]; verbatimElevation: 8 m; Event : year: 2021; month: 6; day: 9; Record Level : institutionCode: MYNU

Description

Holotype female. Body 6.2 mm in length, 2.5 times as long as wide, widest slightly behind middle of elytra. Lengths of body parts (mm): head (0.9), eye (0.3), antenna (1.2), pronotum (1.2), elytra (4.1); width: head (1.1), eye (0.2), pronotum (1.2), elytra (1.8).

Habitus (Fig. 10 ). Body oblong, slender, moderately convex dorsally and feebly convex ventrally, dull. Colour mostly blackish; mouthparts, gula, basal four antennomeres and tarsi dark brownish. Body mostly covered with short, thick, yellowish setae; gula mostly glabrous; antennae, apices of tibiae and tarsi covered with longer and thinner setae; labrum with longer and stronger setae at outer margin.

Head transversely elliptical, widest at eye level, strongly convex posteriorly, almost wholly covered with dense and coarse punctures. Epistoma rather small, crescentic. Genae oblique, with outer margins rounded. Eyes large, convex laterally, with strong inner ocular sulci. Gula (Fig. 3 b) convex, almost smooth.

Mouthparts. Labrum liguliform, surface microreticulate. Maxillary palpi with terminal palpomere securiform. Labial palpi with terminal palpomere elongated conical. Mentum hippocrepiform, with 3-4 setae. Submental peduncle trapezoidal.

Antennae (Fig. 4 b) short and robust, strongly flattened, about 1/4 length of body and as long as head width. Length ratio of antennomeres from base to apex: 2.2:1.7:2.0:1.3:1.0:1.5:1.8:1.8:1.5:2.0:3.3; width ratio: 1.3:1.3:1.0:1.0:1.3:1.8:2.2:2.7:2.0:2.2:2.3. Scape robust, 1.6 times as long as wide; pedicel to antennomere V subcylindrical, without stalks; antennomere V 1.3 times as long as wide, moderately dilated; VI-X dilated, somewhat cyathiform, with short stalks; XI longitudinally ovate; apical six antennomeres forming an oblong club, 1.7 times as long as basal four.

Prothorax. Pronotum (Fig. 3 d) subcylindrical, length equal to width, broadest at middle. Margins not beaded; anterior margin arched, slightly straight in middle; basal margin slightly emarginate laterally; lateral margins feebly crenulate, slightly emarginate near base. Anterior corners subrectangular, with apices rounded in dorsal view; posterior corners obtusely rounded. Disc moderately convex; surface covered with dense, ill-defined, coarse, shallow and subround punctures, each with a seta in middle; intervals vaguely carinate. Surface along basal margin with a moderate deep transverse groove. Pronotal hypomera punctate exactly as pronotum. Prosternum transverse, much more sparsely punctate; intervals microreticulate. Prosternal process (Fig. 3 f) narrow, linguiform, slightly elevated between coxae, apex reaching posterior margin of prothorax.

Scutellar shield linguiform, rounded at apex. Disc densely and minutely wrinkled.

Elytra elongate, 2.3 times as long as widest part, widest at apical 3/7. Elytra strongly convex in lateral view, especially in apical half. Lateral margins gradually widened from humeri to apical 3/7, then gradually narrowing to rounded apices. Each elytron with nine irregular rows of close and coarse punctures and short scutellary row in basal 1/6; intervals feebly convex and sparsely covered with small tubercles throughout. Epipleura wide at base, narrowing towards apex and terminating near apex and sparsely and finely punctate. Hind wings fully developed. Mesoventrite weakly convex towards middle, sparsely punctate, denser posteriorly. Mesepisternum and mesepimeron both triangular, densely punctate. Metaventrite densely punctate and finely grooved along mid-line in posterior half. Metepisternum rather long and thin, densely punctate.

Legs. Femora weakly dilated. Tibiae straight, more or less clavate; protibiae slightly bent near apex of lower side. Tarsi stout. Femora and tibiae densely and coarsely punctate. Setae longer and denser in lower sides of all legs.

Abdomen. Abdominal sternites III-VI transverse, almost equal in length, densely punctate; intercoxal process on sternite III large, subtriangular; sternite VII semicircular, widely rounded at posterior margin; sternite VIII (Fig. 12 a) rounded at posterior margin, disc largely membranous; spiculum ventrale rather long and slender. Abdominal tergite VII semicircular, widely rounded at posterior margin; tergite VIII (Fig. 12 b) slightly emarginate at middle of posterior margin, with wide longitudinal membranous area along mid-line. Defensive glands with two large membranous pouches as shown in Fig. 11 .

Ovipositor (Fig. 12 c and d) strongly sclerotised, gently curved dorsally, with coxites slightly fused; coxite lobe 1 the longest, length ratio of coxite lobes 1-4 about 3:1:2:1; paraproct baculus enlarged at apex. Female genital tubes (Fig. 9 b): vagina slender in anterior part, almost gradually inflated in fusiform posterior part; oviduct produced from posterior part of vagina; spermathecal duct short, about 3/4 length of ovipositor, opening at anterior end of vagina; spermatheca globular, at apex of spermathecal duct; bursa copulatrix and spermathecal accessory gland absent.

Male. Unknown.

Diagnosis

Except for Falsonannocerus thailandicus Masumoto, 1986 re-described above and F. tsuyukii Masumoto, 1986 from Thailand, F. haizhuensis sp. n. is readily differentiated from other congeners by the combination of the following characters: body colour is without colourful metallic lustre; pronotum is subcylindrical, with its length equal to width; intervals of puncture rows on elytra are covered with small tubercles throughout. For the former two species, the new species can be distinguished from them by the following characters:

In F. thailandicus , body colour is mostly reddish-brown, dull (Figs 1 , 2 a); gula is strongly wrinkled (Fig. 3 a); antennomere V is wider than long, 1.4 times as wide as long (Fig. 4 a); pronotum is covered with dense, well-defined, coarse, deep and subcircular punctures and intervals are distinctly carinate (Fig. 3 c); pronotal posterior corners are slightly projected, acute (Fig. 3 c); prosternal process with its apex reaching posterior margin of procoxae (Fig. 3 e); intervals of puncture rows on elytra are densely covered with small tubercles throughout (Fig. 1 a); vagina is rather slender in the anterior part, adruptly inflated in the posterior part (Fig. 9 a); spermathecal duct is long, about 1.7 times as long as ovipositor (Fig. 9 a). While in F. haizhuensis sp. n., body colour is mostly blackish, dull (Fig. 10 ); gula is almost smooth (Fig. 3 b); antennomere V is longer than wide, 1.3 times as long as wide (Fig. 4 b); pronotum is covered with dense, ill-defined, coarse, shallow and subcircular punctures and intervals are vaguely carinate (Fig. 3 d); pronotal posterior corners are obtusely rounded (Fig. 3 d); prosternal process with its apex reaching posterior margin of prothorax (Fig. 3 f); intervals of puncture rows on elytra are sparsely covered with small tubercles throughout (Fig. 10 a); vagina is slender in the anterior part, almost gradually inflated in the posterior part (Fig. 9 b); spermathecal duct is short, about 3/4 length of ovipositor (Fig. 9 b).

In F. tsuyukii , body colour is mostly reddish-brown, lustrous (Fig. 2 b); pronotum is rounder and more convex, 1.2 times as wide as long (Fig. 2 b); elytra is widest at the middle (Fig. 2 b); intervals of puncture rows on elytra are sparsely scattered with fine tubercles in anterior portion (Fig. 2 b). While in F. haizhuensis sp. n., body colour is mostly blackish, dull (Fig. 10 ); pronotum is subcylindrical and less convex, with its length equal to width (Fig. 3 d); elytra is widest at the apical 3/7 (Fig. 10 a); intervals of puncture rows on elytra are sparsely covered with small tubercles throughout (Fig. 10 a).

Etymology

The specific epithet is from the Chinese name (Pinyin) of the type locality "Haizhu National Wetland Park". The name is an adjective.

Distribution

China (Guangdong).

Figures

Figure 1. Habitus of Falsonannocerus thailandicus Masumoto, 1986 from Yunnan, China. Scale bar = 1 mm. a: dorsal view; b: ventral view; c: lateral view.

Figure 10. Habitus of Falsonannocerus haizhuensis sp. n. from Guangdong, China. Scale bar = 1 mm. a: dorsal view; b: ventral view; c: lateral view.

Figure 11. Defensive glands of Falsonannocerus haizhuensis sp. n. Scale bars = 1 mm.

Figure 12. Falsonannocerus haizhuensis sp. n., female. Scale bars = 1 mm. Abbreviations: cx 1 - cx 4, coxite lobes 1 - 4; pb, paraproct baculus. a: abdominal sternite VIII; b: abdominal tergite VIII; c: ovipositor in dorsal view; d: ovipositor in lateral view.