Drupeus guadunensis, Hájek, 2021

Hájek, Jiří, 2021, A new species of Drupeus Lewis from eastern China (Coleoptera: Ptilodactylidae Cladotominae), Zootaxa 4996 (1), pp. 183-188 : 184-187

Drupeus guadunensis sp. nov.

( Figs. 1–7 )

Type material. Holotype: ♂, “ CHINA: FUJIAN prov. 25.v.2018 / Wuyishan Mts. NNR, Guadun vill. env. / 27°44.0′N, 117°38.7′E, 1075 m / mixed forest+bamboo; wet rock along road / J.HÁjek, D.KrÁl, J.Růžička & L.Sekerka lgt. [p] // HOLOTYPE ♂ / DRUPEUS / guadunensis sp. nov. / J. HÁjek det. 2020 [p, red label]” ( IZCAS) . Paratypes: 2♂♂, 1 ♀, same label data as holotype ( NMPC) ; 1♂, “ CHINA: FUJIAN prov. 23.v.+ 3.vi.2018 / Wuyishan Mts. NNR: Sangang vill. / 27°45.0′N, 117°40.7′E, 720 m; / mixed forest + bamboo; / on vegetation / HÁjek, KrÁl, Růžička & Sekerka lgt. [p]” ( NMPC). Each paratype is provided with the appropriate red printed label .

Description of male holotype. Habitus ( Fig. 1 ). Body oblong-elliptical, cylindrical, shiny. Surface covered with moderately long setae; setation of dorsal surface blackish and yellow, setae on ventral surface yellow.

Coloration. Head black; mouth appendages yellowish; antennae with scape and pedicel yellow-brown, anten- nomeres III–IX black. Pronotum yellow-orange, with darkened margins and well delimited black spot in anterior part—spot of approximately quadrangular shape, medially extending to pronotal base; spot never reaching sides of pronotum. Scutellar shield brown-blackish. Elytra black; humeral bulges and epipleura somewhat lighter, brownishblack. Legs yellow with coxae, posterior parts of femora and tibiae infuscate. Prosternum yellow-orange, prosternal process brown-blackish. Meso- and metaventrite brown-blackish; abdominal ventrites somewhat lighter, orangishbrown.

Head trapezoidal; eyes large, protruding. Surface finely punctate; distance between punctures smaller or equal to puncture diameter anteriorly on clypeus and frons, but distinctly larger than puncture diameter posteriorly on frons and vertex. Antennae long, reaching about 3/4 of elytra; scape barrel-shaped, as long as wide; pedicel short, ring-shaped; antennomeres III–X distinctly flabellate, rami arising from apical part of particular antennomere; antennomere XI long, slender.

Pronotum bell-shaped, widest at base; width/length ratio = 1.87. Anterior and lateral margins with thin but distinct bead; basal margin bisinuate, distinctly crenulate; disc strongly convex. Punctation similar to that of head but sparser, distance between punctures equal to 1–3 puncture diameters.

Scutellar shield cordiform, on anterior margin smooth; finely punctate.

Elytra elongate, slightly wider than pronotum, widest at apical third; length/width ratio = 1.70; length of elytra 4.3 times length of pronotum. Longitudinal striae on elytra indistinct, more apparent in apical half of elytra. Punctation similar to that of pronotum.

Legs slender. Tarsomeres I–IV progressively shortened, tarsomere V longest; claws broadened basally, simple.

Ventral surface. Prosternum with anterior margin deeply V-shaped excavate, finely and sparsely punctate; prosternal process slender, apically slightly turned dorsad. Mesoventrite with cavity to receive prosternal process; mesoventral process with distinct discrimen, apically incised. Metaventrite with discrimen present; finely punctate, punctures coarse on metanepisterna.Abdominal ventrites moderately coarsely punctate, punctures transversely elongate laterally; apical ventrite with posterior margin rounded.

Male genitalia. Aedeagus ( Fig. 3 ) with phallobase subparallel-sided, basal margin truncate; parameres long, as long as phallobase, with small denticle on outer side subapically; penis with dorsal lobe broadly subtriangular in apical part ( Fig. 4 ), ventral lobe with apical margin rounded, laterally serrate ( Fig. 5 ).

Female ( Fig. 2 ). Similar to male in habitus. Antennae shorter, reaching approximately midlength of elytra; antennomeres III–X serrate, relative length of antennomeres as follows: 2.2: 1.0: 3.7: 2.3: 2.4: 2.4: 2.5: 2.3: 2.4: 2.4: 3.9. Urosternite ( Fig. 6 ) with short and slender apodeme; lateral struts projecting posteriorly. Ovipositor ( Fig. 7 ) with gonocoxites undivided and partly fused to paraprocts; gonocoxites with obtuse apices, gonostyli absent; ventral sclerite elongate, slender.

Variability. There is only little variability in the extent and shape of the dark spot on pronotum in the limited number of specimens available: in some specimens, the spot is almost umbrella-shaped, with medial extension nearly to the basal margin of pronotum.

Measurements. Total length. ♂♂: 4.9–5.6 mm (holotype: 5.1 mm); ♀: 5.6 mm. Maximum width. ♂♂: 2.4–2.7 mm (holotype: 2.5 mm); ♀: 2.8 mm.

Differential diagnosis. The new species is very similar to the other Chinese Drupeus . It can be recognized based on the presence of well delimited black spot in anterior part of pronotum, which does not reach pronotal sides. Drupeus guadunensis sp. nov. is in that character similar to an unidentified Drupeus female from Guang- dong, mentioned by Yoshitomi & HÁjek (2016); however, the latter female has the dark spot reaching the sides of the pronotum ( Fig. 10 ). In addition, the male of D. guadunensis sp. nov. can be recognized from male of D. cheni Yoshitomi & HÁjek, 2016 with antennomeres III–X distinctly flabellate: the length/width ratio of antennomere III is 0.85 in D. guadunensis sp. nov., but 1.20 in D. cheni ; the same ratio of antennomere IV is 0.57 in D. guadunensis sp. nov., but 0.66 in D. cheni ; antennomeres V–X have the rami almost twice (1.75–1.90) as long as the respective antennomere length in D. guadunensis sp. nov., but 1.5 times (1.30–1.65) in D. cheni (cf. Figs 1 and 8 ). The genitalia are almost identical in both species, the ventral lobe of the penis is slightly more rounded on the apical margin in D. guadunensis sp. nov. than in D. cheni . The female of D. guadunensis sp. nov. can be recognized with highly elongate antennomere III, its length/width ratio is 3.25 in D. guadunensis sp. nov., 2.33 in D. cheni , and 2.46 in Drupeus sp. (cf. Figs 2 , 9–10 ).

Etymology. The new species is named after its type locality—the village of Guadun [= Kuatun in old literature]. The specific epithet is an adjective.

Collection circumstances. The specimens of the type series were swept from the vegetation on a wet vertical cliff around the road ( Fig. 11 ).

Distribution. To date only known from two close localities in Wuyishan Mountains, Fujian Province, China.

Figures

FIGURE 11. Habitat of Drupeus guadunensis sp. nov. at the type locality. Ca. 2 m high, wet vertical cliff along the road to Guadun.

FIGURES 1–7. Drupeus guadunensis sp. nov. 1. habitus of ♂ holotype; 2. habitus of ♀ paratype; 3. aedeagus in dorsal view; 4. dorsal lobe of penis; 5. ventral lobe of penis; 6. female urosternite; 7. ovipositor. Scale bars: 1–2 = 2 mm; 3–5 = 0.5 mm; 6–7 = 1 mm.

FIGURES 8–10. Habitus of Chinese Drupeus. 8. Drupeus cheni Yoshitomi & HÁjek, 2016 (♂ holotype); 9. D. cheni (♀ para- type); 10. Drupeus sp. (♀, Guangdong Prov., Heishiding). Scale bar = 2 mm.