Gastrocentrum zayuense 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

publication ID	https://dx.doi.org/10.3897/zookeys.979.53765
publication LSID	lsid:zoobank.org:pub:BC56F2AE-D8F9-411E-9C92-81945738E264
persistent identifier	https://treatment.plazi.org/id/D62CD9A2-59CD-587A-A24D-0DF0D9C11CC5
treatment provided by	ZooKeys by Pensoft
scientific name	Gastrocentrum zayuense sp. nov.
status

Treatment

Gastrocentrum zayuense sp. nov. Figures 6 View Figures 1–9 , 10F-H View Figure 10 , 17 View Figure 17 , 18 View Figure 18 , 21 View Figures 20–21 , 24 View Figure 24 , 25 View Figure 25

Holotype.

China: Xizang Autonomous Region, Nyingchi prefecture, Zayü County, Zhowagoin, 2011.VII.1, BI Wenxuan leg, 2500 m / Holotype: Gastrocentrum zayuense sp. nov. Yang & Yang, 2020 (CBWX, male, Fig. 6 View Figures 1–9 ); Paratypes. same as holotype (CBWX, 15 ex.); same as holotype but collected by LIU Ye on 2011.VII.3 (IZAS, 9 ex.); same but collected by Yang Xiaodong on 2011.VII.3 (CCCC, 1 ex.).

Diagnosis.

This species differs from G. gaoligongense sp. nov. by elytral inner surface without wedge-shaped protuberance; tegmen apices with ventral surface streamlined in lateral view (Fig. 17a View Figure 17 ), female bursa copulatrix clearly defined, much narrower than vagina, distal part of spermathecal capsule short, length/width ratio <2.5 (Fig. 18A View Figure 18 ).

Description.

General appearance: length 13-18 mm, somewhat slenderer than G. regulare , light brown. Head: including eyes feebly broader than pronotum; eyes moderately large, distance between eyes slightly greater than the transverse diameter of eye; gular suture slightly convergent in anterior; female antennae broadly expanded laterally from 7th antennomere onwards, while male 7th antennomere less expanded (Fig. 17H View Figure 17 ); vertex and frons finely punctate, postgenae rugose. Pronotum: oblong, length/width ratio ca. 1.5, constricted posteriorly; surface finely and densely punctate, clothed with long, yellow hairs. Elytra: oblong, sides subparallel in basal half and a little widened in apical half, length/width ratio ca. 2.5, vested with light yellow setae; wedge-shaped protuberance absent on inner surface; elytron smooth without asetiferous punctations or with very few asetiferous punctations, number of PAP ranged from 0~27 (n = 26), present on elytral basal disc in six rows in maximum, AAP absent (Fig. 10F-H View Figure 10 ). Legs: outer apex of protibia not extending outwards. Abdomen: intercoxal process of the first ventrite not grooved longitudinally (Fig. 20C View Figures 20–21 ); metacoxal abdominal depressions weekly ridged in anterior margin, perpendicular carinae absent. Male genitalia: pygidium with posterior margin rounded (Fig. 17F View Figure 17 ); sixth ventrite arciform, width twice length, posterior margin rounded, central membranous region small, rhombic, extending from anterior margin to half-length of the ventrite (Fig. 17G View Figure 17 ); tegmen tubiform, length ratio of phallobasic apodeme to phallobase ca. 1: 3.2 (Fig. 17A, B View Figure 17 ); parameres hooked, ventral surface of the hook streamlined in lateral view (Fig. 17a View Figure 17 ); interphallic plate shorter than half length of phallus (Fig. 17D View Figure 17 ); phallus apex knot-like, approximately as long as wide (Fig. 17C, D View Figure 17 ). Female reproductive organs: pygidium subquadrate, posterior margin rounded (Fig. 18B View Figure 18 ); sixth ventrite trapezoidal, twice as broad as long, rounded posteriorly, central membranous region broad and extending posteriorly at sides, apical accessory membranous region absent (Fig. 18C View Figure 18 ); bursa copulatrix clearly defined; spermathecal gland with a top tail of medium length; spermathecal duct inflated distally where continuous with spermathecal capsule; spermathecal capsule simple or feebly bifurcate (Fig. 18D-J View Figure 18 ), distal part of spermathecal capsule short, length/width ratio <2.5 (Fig. 18A, E-J View Figure 18 ).

Variation.

All examined specimens are from exactly same locality, they vary individually in the number of punctations on one elytron from zero to 27, and spermatheca apex being simple or feebly bifurcate distally.

Distribution.

China (Xizang, Zayü).

Ecology.

Habitat is shown in Fig. 24 View Figure 24 . The specimens were collected on the tree trunk at night.

Etymology.

The new species is named after its type locality.