A New Species of the Subgenus Trichocellus (Genus Dicheirotrichus

ZOOSYSTEMATICA ROSSICA, 24(2): 260–265 25 DECEMBER 2015

A new species of the subgenus Trichocellus (genus Dicheirotrichus) from Xinjiang, China (Coleoptera: Carabidae: Harpalini) Новый вид подрода Trichocellus (род Dicheirotrichus) из Синьцзяна, Китай (Coleoptera: Carabidae: Harpalini)

B.M. KATAEV* & I.I. KABAK

Б.М. КАТАЕВ, И.И. КАБАК

B.M. Kataev, Zoological Institute, Russian Academy of Sciences, 1 Universitetskaya Emb., St Petersburg 199034, Russia. E-mail: [email protected] I.I. Kabak, All-Russian Institute of Plant Protection, 3 Podbelskogo, St Petersburg – Pushkin 196608, Russia. E-mail: [email protected]

Dicheirotrichus (Trichocellus) pevtsovi sp. nov. is described from the western and southern outlying districts of Taklimakan Desert, southwestern Xinjiang, China. Описан Dicheirotrichus (Trichocellus) pevtsovi sp. nov. из западной и южной части пустыни Такла-Макан, юго-западный Синьцзян, Китай. Key words: ground beetles, China, Xinjiang, Coleoptera, Carabidae, Harpalini, Dicheirot- richus, Trichocellus, new species Ключевые слова: жужелицы, Китай, Синьцзян, Coleoptera, Carabidae, Harpalini, Dichei- rotrichus, Trichocellus, новый вид

INTRODUCTION MATERIAL AND METHODS

The subgenus Trichocellus Ganglbauer, The following abbreviations are used for 1892 of the genus Dicheirotrichus Jacquelin the depositories of the specimens examined: du Val, 1857 comprises 33 described spe- IRSNB — Institut Royal des Sciences Na- cies distributed in the Holarctic Region, turelles de Belgique, Bruxelles, Belgique; with most species concentrated in Middle ZIN — Zoological Institute of the Russian and Central Asia. The species live mostly in Academy of Sciences, Saint Petersburg, open arid landscapes and occur often near Russia. water. A single revision of this subgenus was Measurements were taken as follows: published by Tschitschérine (1899). Sev- body length, measured from the anterior eral new species were described during last margin of the clypeus to the elytral apex; 25 years (Kabak & Kataev, 1993; Komarov, width of head, measured as the maximum 1995; Kataev & Wrase, 1996, 2006; Kataev linear distance across the head, including & Shilenkov, 1997). In the present paper, a the compound eyes (HWmax), and as the new species of Trichocellus is described from minimum linear distance across the neck southwestern Xinjiang, China. constriction just behind the eyes (HW- min); length of pronotum (PL), measured along its median line; length of elytra *Corresponding author. (EL), measured from the basal border in

© 2015 Zoological Institute, Russian Academy of Scienсes B. KATAEV & I. KABAK. NEW SPECIES OF SUBGENUS TRICHOCELLUS 261 the scutellar region to the apex of the su- Habitus: as in figures 1, 2. tural angle; maximum width of pronotum Colour. Dorsum moderately shiny, large- (PWmax) and of elytra (EW), both meas- ly light brownish yellow; clypeus, medial ured at their broadest point; minimum portions of frons and vertex, mandibles api- width of pronotum (PWmin), measured at cally, latero-basally and along inner margins its narrowest point near the hind angles. black; labrum usually blackish brown, with Measurements were made under the ste- narrow external margins paler; pronotum reobinocular microscope MBS-10 using with a small oval macula in central portion an ocular-micrometer. The male genitalia and in some specimens also with indistinct were examined in glycerin. darkening along anterior margin and later- The habitus photographs were taken ally between median line and sides; central using a DSLR camera Canon EOS 40D macula variable in size and occasionally in- with a Canon macro lens EF100 mm as a distinct; each elytron with a small elongate base lens and a Minolta MC W. Rokkor 35 blackish brown macula occupying intervals mm as a reverse lens. To achieve sufficient 3 and 4 in their apical quarter and with a depth of focus, 60 shots were taken using smaller elongate blackish brown macula DSLR remote Pro and were combined with occupying interval 2 in its middle portion; the stacking program Zerene Stacker. Post- elytra of some specimens slightly motley processing was done in Adobe Photoshop due to irregular transparent areas through CS 6. which wings are visible. Underside black, occasionally with a yellow macula on pro- TAXONOMY sternum near its anterior margin; epipleura of pronotum and elytra light brownish yel- Order COLEOPTERA low. Palpi, antennae and legs light brown- Family CARABIDAE ish yellow; basal half of apical palpomeres blackish brown; antennomeres 4–11 more Tribe HARPALINI or less clearly infuscate. Pubescence yellow. Subtribe STENOLOPHINA Head. Rather large (HWmax/PWmax = 0.79–0.84; HWmin/PWmax = 0.62–0.65), Genus Dicheirotrichus Jacquelin du Val, somewhat coarsely and irregularly punc- 1857 tate dorsally, with basal portion of clypeus Subgenus Trichocellus Ganglbauer, 1892 smooth; punctation slightly sparser in medial portions of frons and vertex than in Dicheirotrichus (Trichocellus) pevtsovi lateral ones; each puncture bearing a short sp. nov. seta erect or inclined ahead. Eyes large, (Figs 1–7) moderately convex (HWmax/HWmin = Holotype. Male, China, Xinjiang, “Niya– 1.25–1.32), almost reaching buccal fissure Dar’ya before Mazar Imam-Dzhafu-Sadyr, 3/3 ventrally. Tempora short, slightly convex, III [18]90 Pevtsov” [in Cyrillic] (ZIN). setose. Clypeus almost straight apically, in Paratypes. 1 male, same data as for holotype some specimens slightly depressed along ex- (ZIN); 1 male, “Ur.[ochische] Karasay (khr. ternal margins. Labrum with slightly emar- [ebet] Russk[iy]), V–90 Pevtsov” [in Cyrillic] ginate apical margin. Dorsal microsculpture (ZIN); 3 males, 5 females, “Coll. I.R.Sc.N.B., China, Xinjiang, W. Taklimakan desert, Yarkan present along apical margin of clypeus, un- He riv. Valley, Tugay forest, 1140 m, 39°21.953´N der and behind eyes, consisting of obliter- 78°11.639´E, 9–12.VI.2013, I.G. 32.526 Leg. ate isodiametric meshes. Mandibles acute Floriani” (IRSNB, ZIN). at apices. Antennae surpassing pronotal Description. Body length 5.3–6.0 mm, base by three apical antennomeres; middle width 2.2–2.5 mm, in holotype 5.4 and and preapical antennomeres each approxi- 2.2 mm, respectively. mately twice as long as wide; dense short

Figs 1, 2. Dicheirotrichus (Trichocellus) pevtsovi sp. nov., general view, paratypes from Yarkan He Valley (1, male; 2, female). Scale bar: 1.0 mm. pubescence present on antennomeres 4–11 oblique portion on each side, and clearly and much sparser and longer pubescence on ciliate on basal ridge. Apical angles not antennomeres 1–3. protruding anteriad, narrowly rounded at Pronotum. Moderately transverse (PW- apices. Basal angles obtuse, slightly blunt- max/PL = 1.27–1.40; PWmax/PWmin = ed at tips, each bearing a moderately long 1.20–1.30), widest in apical third. Its sides seta (approximately as long as basal anten- rounded in anterior half and almost recti- nomere). Lateral furrows rather narrow linearly or slightly roundly converging in throughout, only slightly evenly widened posterior half. Apical margin very slightly posteriad, reaching basal angles. Pronotal emarginate, very narrowly bordered later- disc moderately convex. Basal foveae large, ally in short distance from apical angles. reaching basal pronotal ridge, separated Basal margin approximately equal to api- from each other by convexity. Areas at basal cal margin, noticeably narrower than ely- angles distinctly flattened. Anterior trans- tral base, very widely rounded or almost verse depression distinct, clearly deepened. straight medially, oblique laterally, with Pronotal surface somewhat coarsely and very narrow, rather indistinct bead along irregularly punctate throughout, but punc-

Figs 3–7. Dicheirotrichus (Trichocellus) pevtsovi sp. nov. (3, laterotergite and stylus, paratype; 4, 5, median lobe of aedeagus, holotype; 6, 7, same, paratype from Yarkan He Valley). Ventral view (3), lateral view (4, 6), dorsal view (5, 7). Scale bar: 0.5 mm. tation in central portion rather sparse and er than others; striae 6 and 7 disappearing finer. Punctures in basal foveae confluent. near basal border of elytra. Intervals almost Each puncture bearing a short seta, usually not narrowed posteriad, rather flat, at most inclined posteriad. Dorsal microsculpture very weakly convex in medio-basal portion absent. of elytra. All intervals punctate, with three Elytra. Moderately convex and rela- punctures in a transverse row across each tively long (EL/EW = 1.53–1.67; EL/ interval. Each puncture bearing a short, PL = 3.36–3.55; EW/PWmax = 1.56– posteriorly inclined seta. Microsculpture 1.64), slightly widened posteriad, widest visible throughout; meshes isodiametric, just behind middle, and widely rounded at obliterate on disc, more distinct along three sides. Humeri prominent, widely rounded. lateral intervals and at apex. Preapical sinuations extremely shallow, al- Wings developed, longer than elytra. most indistinct. Sutural angles narrowly Ventral surface. Metepisterna long and rounded or blunted at tips. Basal border narrow, strongly narrowed posteriad. Anal slightly sinuate, arcuately curving inside sternite in both sexes rounded at apex, with humerus up to lateral margin. Parascutel- one pair of marginal setae in male and two lar pore present; parascutellar striole rudi- pairs in female. mentary, often absent. Interval 3 in apical Legs. Pro- and mesotarsomeres 5 with third with a discal setigerous pore at stria two pairs of ventro-lateral setae, metatar- 2. Umbilicate series consisting of six setig- somere 5 with three pairs of such setae. erous pores in anterior group and of eight Metatarsus slender, approximately as long (4+4) such pores in posterior group. Striae as HWmax; metatarsomere 1 noticeably impunctate, superficial; striae 7 and 8 weak- longer than metatarsomere 2 and shorter

© 2015 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 24(2): 260–265 264 B. KATAEV & I. KABAK. NEW SPECIES OF SUBGENUS TRICHOCELLUS than 2+3. In male protarsomeres 1–4 mode- aspect. In addition, the medial and preapi- rately dilated, each with biseriate vestiture cal maculae on elytra of D. discolor are con- ventrally; mesotarsus not dilated. nected and usually larger. The median lobe Female genitalia (Fig. 3). Lateroter- of D. pevtsovi sp. nov. is somewhat similar gite asymmetrical, moderately wide, with in lateral aspect to that of D. (Trichocellus) membranous distal mesal margin, without roborowskii (Tschitschérine, 1899) dis- spines or setae. Basal stylomere widened tributed over the Mongolian and Tibetan apicad, also without spines or setae. Apical plateaus as well as in the Inner Tien Shan, stylomere curved, rather long, with mode- but relatively much longer, and (in dorsal rately wide base, strongly narrowed apicad, aspect) much narrower, almost parallel-sid- with a seta on outer ventral margin before ed. In external characters, D. roborowskii is middle. easily distinguished from the new species Median lobe of aedeagus (Figs 4–7). by smaller body size (4.2–5.0 mm) and by Rather slender, evenly arcuate, not swollen having much sparser punctation on the at apex (lateral aspect); narrowed apicad, pronotum and elytra (the pronotal disc im- narrowly rounded at tip, with sides round- punctate in central portion and the elytral ed in basal two thirds and slightly sinuate intervals with at most one or two punctures in apical third (dorsal aspect). Internal sac in a transverse row). with almost symmetrical pattern of tiny Remarks. The record of D. discolor punc- spines, including slightly larger spines on tidorsis from Xinjiang, China (Jaeger & Ka- left side preapically. taev, 2003) is actually based on the speci- Distribution. This new species is known mens of D. pevtsovi sp. nov., although an from the western and southern outlying dis- occurrence of the former taxon in Xinjiang tricts of Taklimakan Desert, southwestern is possible. Xinjiang, China. Etymology. The new species is named ACKNOWLEDGEMENTS after its first collector, the famous Rus- sian traveler and explorer of Central Asia, We express our sincere thanks to Dr. A. Dru- Mikhail V. Pevtsov (1843–1902). mont (IRSNB) for providing specimens used Comparison. In general habitus, this in this study. The study was performed (for new species is very similar to D. (Trichocel- BMK) in the frame of the state research project lus) discolor (Faldermann, 1835), particu- No. 01201351189 and supported by the Russian Foundation for Basic Research (grant No. 13- larly, in having pronotum with small oval 04-01002a). dark macula and elytral epipleurae not infuscate, to the subspecies D. d. punctidorsis REFERENCES (Reitter, 1899) distributed in the arid areas of Kazakhstan, Uzbekistan, Kyrgyzstan, Ta- Jaeger B. & Kataev B. 2003. Stenolophina. In: jikistan, Turkmenistan and northern Iran. Löbl L. & Smetana A. (Eds.). Catalogue Dicheirotrichus pevtsovi sp. nov. distinctly of Palaearctic Coleoptera. Volume 1. Archo- differs from the latter species in the body stemata – Myxophaga – Adephaga: 397–406. size larger, the elytral disc with microscu- Stenstrup: Apollo Books. lpture, and the median lobe of the aede agus Kabak I.I. & Kataev B.M. 1993. Two new spe- narrower in dorsal aspect and much more cies of the genus Trichocellus from the Tien Shan (Coleoptera: Carabidae). Zoosystem- strongly arcuate in lateral aspect. In D. dis- atica Rossica, 2(2): 293–296. color, the body length is 4.4–5.1 mm, the Kataev B.M. & Shilenkov V.G. 1997. A new elytral microsculpture is present only at species of Dicheirotrichus (subgenus Tricho- apex, and the median lobe is very weakly cellus) from North-East Siberia (Coleoptera: arcuate, nearly straight in lateral aspect, Carabidae). Zoosystematica Rossica, 5(2) and rather evenly rounded at sides in dorsal [1996]: 261–262.

Kataev B.M. & Wrase D.W. 1996. A new Di- (Kabak & Kataev 1994) (Coleoptera, Cara- cheirotrichus Duv. and a new Harpalus Latr. bidae). Linzer Biologische Beiträge, 38(1): (Coleoptera, Carabidae) from Sichuan, 717–729. China. Linzer Biologische Beiträge, 28(1): Komarov E.V. 1995. New species of ground- 517–523. beetles (Coleoptera, Carabidae) from Rus- Kataev B.M. & Wrase D.W. 2006. Three new sia, Kazakhstan and states of Central Asia. species of the subgenus Trichocellus Gangl- Selevinia, 4: 3–8. (In Russian). bauer 1891 of the genus Dicheirotrichus Jac- Tschitschérine T. 1899. Mémoire sur le genre quelin du Val 1857 from the East Palaearctic, Trichocellus (Ganglb.). Horae Societatis Ento- with description of the male of D. stenothorax mologicae Rossicae, 32 [1898]: 444–477. Received 2 September 2015 / Accepted 29 October 2015 Editorial responsibility: N.N. Yunakov