Morimotoidius cavicola Wang, Pang & Tian, 2015, sp. n.
Creators: name: Wang, Xinhui
name: Pang, Jianmei
name: Tian, Mingyi
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Morimotoidius
Morimotoidius cavicola

description: Morimotoidius cavicola sp. n.
(Figs 1–3, 5–10, 15)
Description. Body length: 8.4–10.0 mm; width: 2.5–3.7 mm. Habitus as in Figs 1–2.
Dorsal surface black, but inner margins and apices of mandibles, labrum, clypeus and femora (except basal and apical tips) dark brown; bases of mandibles, antennae, palps, and legs including basal and apices of femora yellow brown.
Microsculpture: Engraved meshes strongly transverse on head, densely and transversely striate on pronotum and elytra, clearly isodiametric on scutellum.
Head elongate, much longer than wide, HL/HW=1.55–1.75 (mean 1.68), widest at about middle from labrum to neck; neck constriction distinct; oblique part of tempora about two times longer than eye; eyes flat; two supraorbital setiferous pores present on either side, posterior one distant from eyes; interspace between anterior supraorbital pores distinctly wider than that between posterior ones; distance between anterior and posterior pores slightly longer than diameter of eye; frons and vertex moderately convex; clypeus bisetose; labrum subquadrate, frontal margin almost straight, sexsetose; mandibles elongated, porrected part of left mandible longer than labrum; right mandible bearing an anterior retinacular tooth midway on the mesal cutting margin, with short and blunt terebral and posterior retinacular teeth at base; antennae slender, reaching apical 1/5 of elytra; antennomere 2 the shortest, half as long as antennomere 1, antennomere 3 longest, gradually shortened from antennomeres 4 to 11; antennomeres 1 to 3 glabrous, antennomere 1 and 2 each with only one seta on outer side, antennomere 3 with some verticillate setae at apex; densely pubescent from segment 4; palpi slender, labial palpi glabrous, the penultimate bearing two setae on inner margin, and an additional short seta at apex; maxillary palpomere 2 a little longer than palpomere 3; ligula broad, with two setae at apex; labial suture well developed; mentum tooth simple, submentum bearing a pair of longer inner setae, and a pair of shorter outer setae.
Pronotum (Fig. 3) almost as wide as head including eyes, much longer than wide, widest at about middle, and equally narrowed in front and behind; PL/PW=1.50–1.55 (mean 1.53); slightly expanded medially; front almost straight, slightly narrower than base, PWB/PWA=1.04–1.13 (mean 1.07), finely bordered, front angles nearly rectangular; lateral margins with evenly and distinctly explanate-reflexed areas throughout, without lateral setae; base slightly arcuate, unbordered, hind angles broadly rectangular; pronotal disc moderately convex, median line deep; basal foveae large but shallow, sparsely punctured; scutellum moderately sized.
Elytra elongate, much wider than head and pronotum, widest a little behind middle; much longer than wide, EL/EW=1.69–1.78 (mean 1.74); shoulders effaced; basal border slightly arcuate, obtusely angulate at the base of interval 5; parascutellar setae present; disc moderately convex; striae deep, continuous and smooth, weakly punctured; intervals strongly convex, intervals 3 with three setiferous pores, at about 9/10, middle and 1/5 from apex, respectively, anterior one close to stria 3, others to stria 2; apical pores usually three in number, one at the apex of interval 1, other two at apex of interval 7; marginal series of umbilicate pores 19–21 in number; scutellar stria well developed and long; hind wings reduced.
Abdominal sternum VII with a single pair of setae near apical margin in male, but two pairs in female.
Legs long and slender; procoxa asetose, meso– and metacoxae bisetose, metacoxa without inner seta; trochanters unisetose; pro–, meso– and metafemora bisetose ventrally; tibiae and tarsomeres 1 to 3 longitudinally bisulcate; protarsomeres 1 to 3 dilated and with two rows of sparse spongy setae ventrally in male; tarsomere 4 with apical setae, subapical setae absent; tarsomere 5 glabrous ventrally; claws smooth.
Male genitalia (Figs 5–7): Median lobe of aedeagus stout with basal bulb large, in lateral view strongly arcuate in middle portion, blunt at tip; dorsal opening wide, nearly half of whole length of median lobe, reaching about 1/3 from base; apical lamella short and broad, a little longer than wider, rounded at apex; internal sac almost completely covered with sclerotized scales, without sclerotized spines; left paramere wider and longer than the right.
Female reproductive tract (Figs 8–10): Gonosubcoxite with 13–15 fringe setae at apical area; gonocoxite with 2–4 lateral ensiform setae and 1 dorsal ensiform seta; bursa copulatrix symmetrical, with the common oviduct entering medially; spermathecal duct short and broad, spermathecal gland duct at base of spermathecal reservoir.
Remarks. Morimotoidius cavicola sp. n. is similar to M. zhushandong, but differs from the latter in pronotal shape, which is shorter (PL/PW=1.50–1.55) and only slightly expanded medially (while longer (PL/PW=1.59– 1.62) and more distinctly expanded in M. zhushandong) (Figs 3–4). The aedeagus of the new species has a stouter and broader apical lamella.
Material examined. Holotype: male, Guanfeng Dong, Shanggui Cun, Jinrui Zhen, Yichun City, western Jiangxi Province, China, 27°54'51.06"N, 114°11'25.68"E, 151 m in altitude, 24-IX-2014, leg. Sunbin Huang & Xinhui Wang, deposited in the insect collections of South China Agricultural University, Guangzhou, China (SCAU); paratypes: 5 females, ibid. in SCAU.
Etymolog y. Indicating a cave-dwelling beetle of the new species.
Distribution. China (Jiangxi). Known only from a limestone cave called Guanfeng Dong in northwestern Yichun City, western Jiangxi Province (Fig. 11). Guanfeng Dong is about 25 km far from the cave Zhushan Dong II, the type locality of M. zhushandong. The cave (Figs 12–14) is located at the foot of a hill which is covered by dense brushes, with a quite large entrance. It is a dry and long cave according to the native people, but the length remains unknown. The six ground beetles (Fig. 15) were collected on walls and under stone in dark zone, about 20 meters in from the entrance.
description: Published as part of Wang, Xinhui, Pang, Jianmei & Tian, Mingyi, 2015, Second highly modified hypogean species of the genus Morimotoidius Habu from western Jiangxi Province, China, with a new locality for M. zhushandong (Coleoptera: Carabidae: Platynini), pp. 587-593 in Zootaxa 4034 (3) on pages 588-593, DOI: 10.11646/zootaxa.4034.3.10, http://zenodo.org/record/233626