Jujiroa maotiani sp. nov.

(Chinese common name: K天Āae±ş)

(Figs. 1a; 2–5)

Type material. Holotype: male, cave Haozhidong, Shuanghekou, Banan, Chongqing, 29°58'60.60"N, 106°95'95.79"E, 790m, XII-11-2024, leg. Fanhao Zeng & Maotian Tang, in SCAU.

Diagnosis. A small-sized Jujiroa species, body depigmented, microphthalmic, anterior angles of pronotum moderately protruded, elytra mucronate at apices, striae finely punctate, presence of only one dorsal seta along stria 2.

Description. Length 12.8 mm; width 3.6 mm. Habitus as in Fig. 2.

Body yellowish brown, head somewhat darker, surface smooth and glabrous (though rough on sides and lateral margins of pronotum), strongly shiny. Microsculptural meshes nearly isodiametric on head, transverse on pronotum and elytra.

Head (Fig. 3A) ovate, much longer than wide, HLm/HW = 2.05, HLl/HW = 1.48; widest just behind eyes; genae convex, expanded at sides; neck moderately constricted; frontal furrows very short and shallow, ending before the level of anterior supraorbital setae; two pairs of supraorbital setae present, anterior at about middle of head from labrum to neck, posterior at about basal 1/3 of head; eyes very small and flat; clypeus bisetose, labrum trisinuate at front margin, 6-setosed; mandibles elongated, teeth reduced; labial suture clear; mentum with one seta on each side just in front of the basal pit which is very small; median tooth short, bluntly bifid at tip, about half as long as lateral lobes; submentum with two setae on each side, inner ones longer; ligula short, widened and truncate at apical margin, bisetose; palpomeres long and slender, labial palpomere 2 bisetose on inner margin, 1.15 times as long as 3, maxillary palpomere 3 1.21 times as long as 4. Antennomeres filiform, thin and very long, extended to apices of elytra, antennomeres 1–3 glabrous, each of antennomeres 1 and 2 with a seta near apex, pubescent from 4; antennomere 2 shortest, while 4 longest; relative length of each antennomere compared with antennomere 2 as follows: 1 (2.44), 2 (1.00), 3 (2.61), 4 (2.82), 5 (2.70), 6 (2.81), 7 (2.41), 8 (2.18), 9 (2.09), 10 (1.82) and 11 (1.88).

Pronotum (Fig. 3B) slightly longer than wide, PL/PW = 1.05; wider but slightly shorter than head, PW/ HW=1.25, PL/HLl = 0.87; widest at about 2/5 from front, lateral margins including front and hind angles widely reflexed throughout, gently and gradually narrowed toward hind angles that are rectangular, fore angles roundly and moderately protruded forwardly; basal foveae short but well-marked; mid-line well marked; only basal latero-marginal setae present, inserted on the hind angles; entire lateral margins and front without borders, base finely bordered, nearly straight, slightly wider than front which is slightly emarginate, PbW/PfW = 1.05. Scutellum small, triangular.

Elytra (Fig. 3C) elongate, much longer than wide, EL/EW = 1.80; distinctly longer than forebody including mandibles, much wider than pronotum; base with distinct borders (but interrupted against the interval), shoulders nearly rounded; widest at about 4/7 of elytra from base, apex distinctly protruded, mucronate; disc convex, striae entire, impressed by small but deep punctures; scutellar striole short; basal setae present; interval 3 with only one dorsal seta close to stria 2 at about apical 1/5 of elytra; three setae present on stria 7 posteriorly, an apical seta present at apical of stria 1; presence of 19 marginal setae, continuous.

Legs slender and elongate, procoxae asetose, mesocoxae tirsetose, metacoxae bisetose, without inner seta; each trochanter with a single seta; metafemur bisetose posteriorly; tibiae and tarsi smooth, with longitudinal sulci externally; tarsomere 4 bilobed in fore and middle legs, deeply emarginated in hind ones; protarsi not modified in male, but 1–3 each with two rows of spongy setae on ventral surface.

Ventral surface smooth and glabrous, each abdominal ventrite IV–VI bisetose, ventrite VII bisetose in male.

Male genitalia (Fig. 4): Median lobe very slender and elongate (Fig. 4A), nearly straight in middle portion, then gradually curved towards apex which is bluntly pointed; base moderately opened, presence of a small sagittal aileron; parameres developed (Fig. 4B). In ventral view, apical lobe thin, much longer than wide (Fig. 4C).

Remarks. Similar to J. deliciola Uéno & Kishimoto, 2001 (from three caves in Xingwen County, Yibin, southern Sichuan) (Uéno & Kishimoto 2001; Tian & He 2020a; Tian et al. 2023) in having elongate, shiny and glabrous body and pronotum which is slightly longer than wide, but J. maotiani sp. nov. is recognized by distinctly small and flat eyes, smaller mucronate elytral apices and broader head; it is also easily distinguished from J. wangzheni Tian & He, 2020 (Tian & He 2020b) by a shinier body, small and deeply punctate striae of elytra which are with one dorsal seta on interval 3.

Distribution. China (Chongqing). Known only from the cave Haozhidong in Shuanghekou, Banan, Chongqing (Fig. 1a; 5).

The entrance of the cave is small and narrow (Fig. 5A), its tunnel is almost vertical at first and gradually becomes flatter, with several branches and several pools. The full extent of the cave could not be explored because of oxygen deficiency and the narrow passages. The individual of J. maotiani sp. nov. was collected on the ground in moist and gravelly areas. Other creatures found also inside the same cave were Sitotroga sp. (Lepidoptera: Gelechiidae) (Fig. 5C), Myotis sp. (Chiroptera: Vespertilionidae) (Fig. 5D), Glyphiulus sp. (Spirostreptida: Cambalopsidae) (Fig. 5E) and Eutrichodesmus sp. (Polydesmida: Haplodesmidae) (Fig. 5F).

Etymology. Dedicated to Mr. Maotian Tang, the co-collector of the holotype specimen.