Morimotoidius cavicola, Wang, Xinhui, Pang, Jianmei & Tian, Mingyi, 2015

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), Zootaxa 4034 (3), pp. 587-593 : 588-593

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.

Figures

FIGURE 11. Distribution map of Morimotoidius species in western Jiangxi. (star: M. zhushandong; sun: M. cavicola sp. n.)

FIGURES 1 – 2. Hatibus of Morimotoidius cavicola sp. n. 1. holotype, male; 2. a paratype, female

FIGURES 3 – 7. Morimotoidius species. 3. pronotum of M. cavicola sp. n., dorsal view; 4. pronotum of M. zhushandong, dorsal view; 5. Aedeagal median lobe of M. cavicola sp. n., lateral view; 6. ibid, apical lamella, dorsal view; 7. Aedeagal parameres of M. cavicola sp. n.

FIGURES 8 – 10. Female reproductive tract of M. cavicola sp. n. 8. reproductive tract, ventral view; 9. right gonocoxite and gonosubcoxite, dorsal view; 10. left gonocoxite and gonosubcoxite, ventral view. (bc. bursa copulatrix; co. common oviduct; gcx. gonocoxite; gscx. gonosubcoxite; sd. spermathecal duct; sg. spermathecal gland; sgd. spermathecal gland duct; sp. spermatheca).

FIGURES 12 – 15. Cave Guanfeng Dong, type locality of M. cavicola sp. n. 12. location of the cave (indicated by arrowhead); 13. entrance; 14. environment of entrance; 15. an adult of M. cavicola sp. n.