Jujiroa uenoi, Tian & He, 2020

Tian, Mingyi & He, Li, 2020, A contribution to the knowledge of cavernicolous ground beetles from Sichuan Province, southwestern China (Coleoptera, Carabidae, Trechini, Platynini), ZooKeys 1008, pp. 61-91 : 61

Jujiroa uenoi sp. nov. Chinese name: 上野穴胫步甲 Figs 2 , 12 , 13A , 14 , 15

Material.

Holotype: male, cave Banche Dong, Jianshanzi, north side of the Dadu River, Shawan, Leshan, Sichuan (四川省乐山市沙湾区大渡河北岸尖山子搬车洞), 29.21043°N, 103.58349°E, 670 m, 2020-V-30, leg. Li He, Yuan Li & Hao Long, in SCAU. Paratype: 1 female, idem, in SCAU.

Diagnosis.

Medium-sized Jujiroa species, body depigmented, microphthalmic, head thin and slightly expanded at sides, antennae not extending to apices of elytra, fore angles of pronotum distinctly protruded, elytra mucronate at apices, striae finely punctate, presence of two dorsal pores along the 2nd stria, tarsi smooth.

Description.

Length: 15.0-15.5 mm; width: 4.5 mm. Habitus as in Fig. 12 .

Body concolorous yellow or brown, but a little darker on head, surface smooth and glabrous (though rough on sides and lateral margins of pronotum), moderately shiny. Microsculptural meshes finely and transversely striate on head, pronotum and elytra.

Head thin and elongate, much longer than wide, HLm/HW = 2.06-2.11, HLl/HW = 1.53-1.48; widest just behind the level of eyes; genae convex, and slightly expanded at side; frontal furrows short and shallow, ending before the level of anterior supraorbital pores; two pairs of supraorbital pores present, anterior at about middle of head from labrum to neck, posterior about basal 2/7 of head; eyes very small and flat; clypeus bisetose, labrum bisinuate at front margin, 6-setose; mandibles elongated, teeth reduced; labial suture clear; mentum with two setae on each side just in front of the basal pits which are very small; median tooth short, about half as long as lateral lobes, bluntly bifid at tip; submentum with two setae on each side, inner ones longer; ligula short, widened and truncated at apical margin, bisetose; palpomeres long and slender, the 2nd labial palpomere bisetose on inner margin, 1.2 times as long as 3rd, the 3rd maxillary palpomere as long as 4th; antennae filiform, thin and very long, extended to apical 1/10 (male) or 1/9 (female) of elytra, the 1st to 3rd antennomeres glabrous, each of the 1st and 2nd with a seta near apex, pubescent from the 4th; the 2nd shortest, while 4th longest; relative length of each antennomere compared with the 2nd in the holotype as: the 1st (2.50), 2nd (1.00), 3rd (2.50), 4th (2.93), 5th (2.58), 6th (2.07), 7th (2.29), 8th (2.00), 9th (1.88), 10th (1.64) and 11th (1.71).

Pronotum subcordate, transverse, PL/PW = 0.91-0.92, but a little longer than wide measured through fore angles; much wider but slightly shorter than head, PW/HW = 1.09-1.12, PL/HLl = 0.86-0.96; widest at about 2/5 from front, lateral margins including front and hind angles widely and strongly reflexed throughout, gently and gradually narrowed towards hind angles which are nearly rectangular, fore angle extraordinarily and forwardly protruded, forming a obtuse lobe; basal foveae short but well-marked; only basal latero-marginal setae present, inserted just on the hind angles; entire lateral margins and front without borders, base finely bordered, slightly narrower than front including front angles, PbW/PfW = 0.87-0.88; both base and front nearly straight. Scutellum small.

Elytra elongate, amygdaloid, much longer than wide, EL/EW = 1.80-1.89; distinctly longer than forebody including mandibles, much wider than pronotum; base well-bordered (but unbordered against the 1st interval), shoulders nearly rounded; widest at about middle of elytra, apex distinctly protruded, mucronate; disc convex, marginal depressions well-defined and reflexed throughout, the 9th interval suddenly deepened and distinctly curved at about basal 1/4; striae entire, impressed by small but deep punctures, intervals almost flat; scutellar striole short; basal pores present; the 3rd interval with two setiferous pores close to 2nd stria at about apical 1/5 and 3/7 of elytra respectively; three pores present on 7th stria posteriorly; an apical pore present at apical anastomosis of the 1st and 4th striae; presence of 23-24 marginal umbilicate pores throughout, continuous (Fig. 13A ).

Legs slender and elongate, procoxae asetose, mesocoxae unisetose, metacoxae trisetose (the inner setae present); each trochanter with a single seta; metafemur unisetose posteriorly; tibiae and tarsi smooth, without longitudinal sulci or striae externally; the 4th tarsomere bilobed in fore and middle legs, deeply emarginated in hind ones; protarsi not modified in male, but 1st -3rd each with two spongy setae on ventral surface.

Ventral surface smooth and glabrous. Each abdominal ventrite IV-VI bisetose, ventrite VII bisetose in male, quadrisetose in female.

Male genitalia (Fig. 14A-D ). Median lobe of aedeagus very slender and elongate, gently arcuate in middle portion, then gradually narrowed towards apex which is bluntly pointed; base moderately opened, presence of a small sagittal aileron; parameres developed. In lateral view, apical lobe thin, slightly longer than wide.

Remarks.

Similar to Jujiroa zhouchaoi Tian & He, 2020 and J. satoi Uéno, 2005, but having much longer antennae and distinctly mucronated apices on the elytra. In addition, it is easily distinguished from J. zhouchaoi by a broader head, flat intervals and large punctate striae of the elytra and from J. satoi by a slenderer body with a thin head, and the presence of dorsal pores on the elytra. Furthermore, Jujiroa uenoi sp. nov. has a peculiar character state: presence of an inner seta on each metacoxa, which is absent in other species of Jujiroa .

Etymology.

Dedicated to the late Dr Shun-Ichi Uéno, Science Museum (Natural History), Tokyo.

Distribution.

China (Sichuan). Known only from the cave Banche Dong in Leshan (Fig. 2 ).

Cave Banche Dong is about 1.6 km away in a straight line from Xiaodouyan Tiankeng (硝斗岩天坑), which is a well-known touristic site in Leshan. The opening of the entrance is so narrow that it allows only one person to crawl in at a time (Fig. 15A ). The interior of the cave is small and moist (Fig. 15B ). The two individuals of Jujiroa uenoi sp. nov. were found running on the ground inside cave (Fig. 15C-D ). Other animals observed in the cave are Leopoldamys rats, crickets, moths and Serriphaedusa snails (Fig. 15E-H ).

Figures

Figure 2. Map of Sichuan Province showing the locations of the related caves.

Figure 12. Habitus of Jujiroa uenoi sp. nov., male holotype.

Figure 13. Elytral chaetotaxy of Jujiroa species A J. uenoi sp. nov., male holotype B J. wangzheni sp. nov., female holotype.

Figure 14. Male genitalia of Jujiroa uenoi sp. nov. A median lobe, lateral view B apical part of median lobe, dorsal view C parameres D genital ring, ventral view.

Figure 15. Cave Banche Dong, the type locality of Jujiroa uenoi sp. nov., and some sympatric cave animals A Li He in front of Banche Dong B environs inside cave, arrow indicating the place where a J. uenoi was found C Yuan Li is collecting D an individual of J. uenoi running in cave E Leopoldamys edwardsi (Thomas, 1882) F a cricket G a moth H Serriphaedusa serrata Deshayes, 1870.