Guiodytes yueliangensis Huang & Tian 2021, sp. nov.

Guiodytes yueliangensis Huang & Tian sp. nov.

urn:lsid:zoobank.org:act: 54A7DD47-8EAB-4A9A-9C49-2E6383B4842A

Figs 1, 3E, 4E, 5D, 7–8

Diagnosis

This new species belongs to the group with distinctly projecting clypeal wings and is close to G. deharvengi Tian, 2014, which also occurs in the same karst area in Huanjiang County, by the similar character configuration of head and elytra, but it is easily separated from the latter species by the missing central pore on the frons of the head and the flattened neck constriction. In addition, the pronotum, with the anterior margin almost not emarginate, is much longer, its median line is much narrower, and the anterior transverse line is finely developed.

Etymology

The species epithet is derived from Yueliang Shan (Moon Mountain in Chinese), a famous karst landscape with a naturally-formed moon-like cavern passing through it (Fig. 8A). The type locality, Huang Dong, is one of the caves of this landscape.

Type material

Holotype CHINA • ♂, broken on the left supra-antennal plate; Guangxi, Huanjiang, Shuiyuan, Sancai, Neiwen, Huang Dong; 24°50′05.74″ N, 108°05′1.86″ E; alt. 354 m; 6 Jun. 2017; S. Huang leg.; SCAU.

Description

Male

MEASUREMENTS. Length: 9.3 mm; width: 2.9 mm. Habitus as in Fig. 7.

BODY. Well-pigmented, concolorous dark brown.

HEAD. Stout (Fig. 3E), from apex of mandible slightly longer than wide, HLm/HW= 1.06, or shorter than wide when measured from apex of labrum, HLl/HW = 0.82; clypeus strongly transverse and moderately emarginate, surface of median part moderately convex, bisetose at base, with flattened clypeofrontal sulcus, clypeal wings fused, divided from supra-antennal plates by distinct notches; supra-antennal plates rounded and well developed, reflexed margined, strongly convex, smooth and glabrous; frons and vertex fairly convex; laterally with two setiferous pores, situated at posterior end of supra-antennal plates and at level of neck constriction, respectively; frontal furrows deep, conspicuously widened, subparallel at middle of frons, divergent posteriorly; frontal carinae blunt but well marked, not parallelsided; eyes completely lacking; genae well developed, anteriorly conically raised laterally then sinuated, sides nearly vertically truncated; neck constriction distinct, relatively wide; labrum transverse, slightly emarginate, slightly wider than clypeus, seven-setose, ciliate laterally; mandibles of moderate size. Palpomeres ensiform, glabrous, apical segments of both maxillary and labial palpomeres much longer than penultimate ones, respectively; labial palpomere two bisetose on inner margin; ligula unisetose at apex; labial suture well marked, deeply and widely furrowed in median portion; mentum well developed, with two pairs of setae, one pair situated beneath mental tooth, posterior one localized in centre of two large, deep concavities restricted at base near lateral margin; median tooth simple, pointed at apex, lateral lobes wide, obliquely truncated; submentum narrow, quadrisetose. Antennae filiform, elongate, reaching over base of pronotum; scapus unisetose subapically, pedicellus smooth and glabrous, pubescent from antennomere three; pedicellus slightly longer than antennomere three, then gradually decreasing in length towards penultimate segment, antennomeres five to ten subelongate, penultimate segment slightly shorter than terminal one. Underside of head rough.

THORAX. Pronotum peltate (Fig. 3E), much wider than head, PW/HW=1.25, slightly shorter than wide, PL/PW=0.96; disc strongly convex and with noticeable rugosity; anterior margin unbordered, slightly convex in median portion, margin barely emarginate, anterior transverse line fine and traceable, fore angles protruding; widest slightly behind middle, gently curved and gradually narrowed anteriorly, more evidently contracted towards posterior angles; with distinct teeth at posterior angles, lateral margin between posterior angles and basal constriction with one conspicuous and one minute toothed projections before basal constriction; with two lateral setiferous pores, anterior one at about apical quarter, posterior one at basal angle, just before tooth at posterior angle; reflexed lateral margin nearly smooth, lateral channel with uneven surface, narrower before anterior seta, wider between anterior and posterior lateral setae, interrupted by tooth of posterior angle; basal constriction wide, with noticeable transverse carina; median line deeply furrowed but faint when joined with transverse line in front. Peduncle short, scutellum small. Prosternum and propleura smooth, with dense and isodiametric punctuation.

ABDOMEN. Abdominal ventrites also densely punctured; ventrites four to six each with a pair of setae; ventrite seven with two pairs of subapical setae, widely separated at each side.

WINGS. Elytra elongate ovate, wider than pronotum, EW/PW= 1.29, much longer than wide, EL/ EW=1.84; strongly convex, widest at middle, gently contracted anteriad and posteriad; base with pair of basal setiferous pores located at beginning of stria one, joined with an additional tubercle at base of interval two; shoulders broadly obtuse, with two teeth on each side; apex pointed; sides distinctly crenulated from base to apical third, then very feebly marked towards apex; elytral striae punctatestriate, narrow and deep, with small and isolated punctures, only striae six and seven ending before reaching basal margin of elytron; intervals distinctly convex; intervals seven and eight joined near base, then joined to interval six at base, intervals six to eight carinated near base; arrangement of elytral setiferous chaetotaxy as in Fig. 4E: five foveolate setiferous pores present on interval three; marginal channel with uninterrupted series of small setiferous pores and several large pores bearing much longer setae. Hind wings reduced.

LEGS. Legs moderately elongated; proleg stout, profemur moderately dilated, smooth, with several sparsely distributed setae; protibia well developed, with distinct and complete carina dorsally, sulcus indistinct, quadridentate; lateral teeth blunt at apex, lowest lateral tooth unobtrusive, upper three stoutensiform and moderately protruded anteriorly toward apex; subapical spur elongate-ensiform, blunt at apex, much longer and more slender than uppermost lateral teeth; protarsi slender, tarsomere one very long, much longer than tarsomeres two to four combined; meso- and meta-legs slender, with width of tarsomeres in both narrower than in proleg; mesotibia gradually dilated towards apex, with elongated tuber-like subapical spur, distinctly longer than wide and furnished with isometric seta.

GENITALIA (Fig. 5D). Moderately sclerotized; aedeagus similar to that of G. deharvengi Tian, 2014 (Fig. 5A); median lobe strongly arcuated ventrally, elongated and blunt at apex; copulatory piece irregular, elongated, strongly sclerotized in basal and frontal part; parameres asymmetrical, large one with three setae, small one with four setae.

Female

Unknown.

Distribution

China (Guangxi: Huanjiang County) (Fig. 1). Known only from Huang Dong cave (Fig. 8B). The cave is still preserved as a natural environment and the entrance opens at the middle of the hill. The cave is not well explored and its length remains unknown. The passages in the cave are complicated, and most of them are moist and wet. The single beetle specimen was collected in a wet place about 100 m from the entrance (Fig. 8C).