Gastrocentrum xiaodongi sp. nov.

Yang, Ganyan, Yang, Xingke & Shi, Hongliang, 2020, Taxonomy and phylogeny of the genus Gastrocentrum Gorham (Coleoptera, Cleridae, Tillinae), with the description of five new species, ZooKeys 979, pp. 99-132 : 99

Gastrocentrum xiaodongi sp. nov. Figures 5 , 10D , 16D-H , 25

Holotype.

China: "Xizang (Tibet), Jilongxian [Gyirong county], 1785m, Xinjiangcun, 2019.VI.28, leg. X-D. YANG / Holotype: Gastrocentrum xiaodongi sp. nov. Yang & Yang, 2020" (CCCC, female, Fig. 5 ). Paratypes. Nepal: Manaslu Mts., E slope of Ngadi Khola valley, 2000-2300 m, 14-16.V.2005, leg. J. Schmidt, 28°22'N, 84°29'E (RGCM, 1 male); W-Nepal, Modi Khola, Bhakta B.; Banthanti - 2500 - Landrung - 1600 m, 2.VI.1984 (NHMB, 1 female).

Diagnosis.

This new species is different from G. regulare sp. nov. by: antennae expanded laterally from 8th antennomere onwards; elytral asetiferous punctations stop by middle (Fig. 10D ); elytral inner surface without wedge-shaped protuberance; intercoxal process of first abdominal ventrite not grooved (Fig. 20C , ip); spermathecal capsule thicker, rounded distally (Fig. 16F , sp). The new species also looks similar to G. zayuense sp. nov. and G. gaoligongense sp. nov. at first glance, but it differs from the latter two species by: elytral asetiferous punctations somewhat larger and reaching lateral margins (Fig. 10D ), female antennae expanded laterally from 8th antennomere onwards (Fig. 16H ). It also differs from G. gaoligongense sp. nov. by elytral inner surface without a wedge-shaped protuberance.

Description.

General appearance: length 14 mm, brown, a little slenderer than previous species. Head: including eyes slightly broader than pronotum; eyes moderately large, distance between eyes slightly greater than the transverse diameter of eye; female antennae expanded laterally from 8th antennomere onwards (Fig. 16H ); vertex and frons rugose, densely punctate, postgenae rugose. Pronotum: oblong, length/width ratio ca. 1.6, constricted posteriorly; surface finely and densely punctate, clothed with long, yellow hairs. Elytra: oblong, sides subparallel in basal half and weekly widened in apical half, length/width ratio ca. 2.4, vested with yellow setae; wedge-shaped protuberance absent on inner surface; PAP only present on basal half in ten rows, AAP absent, PAP a little larger than those in G. regulare , G. zayuense , and G. gaoligongense ; interspace between 2nd-3rdPAP rows greater than punctation diameter (Fig. 10D ). Legs: outer apex of protibia not extending outwards. Abdomen: intercoxal process of the first ventrite not grooved longitudinally; metacoxal abdominal depressions weekly ridged in anterior margin, perpendicular carinae absent. Male genitalia: not studied. Female reproductive organs: pygidium slightly broader than long, posterior margin rounded (Fig. 16D ); sixth ventrite semi-circle, central membranous region broad, apical accessory membranous region absent (Fig. 16E ); both dorsal and ventral lamina have three incisions; bursa copulatrix clearly defined; spermathecal gland with a short top tail; spermathecal duct slightly inflated distally; spermathecal capsule rounded in apex, length/width ratio = 2.0. (Fig. 16F, G ).

Distribution.

China (Xizang, Gyirong), Nepal.

Etymology.

We are pleased to dedicate this species to its collector and our friend, Mr Yang Xiaodong.

Figures

Figure 10. Drawing of elytral asetiferous punctations. A Gastrocentrum magnum sp. nov. B G. dux C G. regulare sp. nov. D G. xiaodongi sp. nov. E G. gaoligongense sp. nov. F-H G. zayuense sp. nov. The numbers 1 - 10 annotate the serial rows of primary asetiferous punctuations (PAP). Abbreviations: a accessory asetiferous punctations.

Figure 16. A-C Gastrocentrum regulare sp. nov. female paratype A female reproductive organ B pygidium C sixth ventrite D-H Gastrocentrum xiaodongi sp. nov. female holotype D pygidium E sixth ventrite F, G female reproductive organ H antenna. Abbreviations: bc bursa copulatrix cov common oviduct ovp ovipositor pgb proctigeral bacculi sp spermatheca spg spermathecal gland spgtt top tail of spermathecal gland va vagina v 6 sixth ventrite. Scale bars: 0.5 mm (A-F, H).

Figure 25. Geographical distribution map of the genus Gastrocentrum.

Figures 1 - 9. Habitus. 1 Gastrocentrum magnum sp. nov. Holotype 2 G. dux from Australia 3 G. unicolor (Lectotype of G. pauper) 4 G. regulare sp. nov. Holotype 5 G. xiaodongi sp. nov. Holotype 6 G. zayuense sp. nov. Holotype 7 G. gaoligongense sp. nov. Holotype 8 Tillus nitidus comb. nov. Holotype 9 Isocymatodera atricolor Syntype. Scale bars: 5 mm (1, 2) 2 mm (3 - 9).

Figures 20 - 21. 20 A, B wedge-shaped protuberance on inner surface of elytron with G. unicolor as an example C, D abdomen of G. zayuense in ventral and lateral view showing 1 st- 5 th ventrites with short lateral ridges on each segments E intercoxal process of first ventrite of G. unicolor showing the longitudinal groove F claws of Isocymatodera atricolor. 21 Female reproductive organs of G. zayuense sp. nov. not stained and with the dark background, revealing the internal tissues. Abbreviations: bc bursa copulatrix ip intercoxal process mt microtrichia field pig less pigmented circles on abdominal segments ridge short ridges on abdominal segments spc spermathecal capsule spd spermathecal duct spg spermathecal gland spgd spermathecal gland duct va vagina. Scale bars: 0.5 mm (20 A-D) 1 mm (21).