Eustra shanghaiensis Song

Song, Xiao-Bin, Tang, Liang & Peng, Zhong, 2018, Flanged Bombardier beetles from Shanghai, China, with description of a new species in the genus Eustra Schmidt-Goebel (Coleoptera, Carabidae, Paussinae), ZooKeys 740, pp. 45-57 : 47-49

Eustra shanghaiensis Song sp. n. Figs 1A, 2, 3, 6A 上海双斑粗角步甲

Type material.

Holotype. ♂, (SNUC), labeled 'CHINA: Shanghai, Pudong New District, Shanghai Binjiang Forest Park (上海滨江森林公园), 31°23'25"N, 121°22'10"E, alt. 5 m, 7.v.2017, Song, Peng, Hu, Wang & Liu leg. / HOLOTYPE [red], Eustra shanghaiensis sp. nov., Song det.2017'.

Paratypes. 3♂♂, 3♀♀, (SNHM), same data as holotype; 2♂♂, 2♀♀, (KUM), ditto; 1♂, 1♀, (MNHN), ditto; 5♂♂, 5♀♀, 84 exs, (SNUC), ditto; 74 exs, (cSXB), same data as holotype, but 27.vii.2017, Song, Zhou, Wang, Wang & Zhang leg; 11 exs, (cSXB), same data as holotype, but 24.ix.2016, Zhong Peng leg; 1 ex (cSXB), labeled 'CHINA: Shanghai, Changning District, Tianshan Park (天山公园), 31°12'45"N, 121°24'10"E, alt. 14 m, 20.iv.2008, Xiao-Bin Song leg.; 1ex, (cSXB), ditto, but 12.iv.2008; 1 ex, (cSXB), ditto, but iv.2008; 1 ex, (cBWX), labeled 'CHINA: Shanghai, Pudong New District, nr. Zhangjianggaoke (张江高科), 31°11'84"N, 121°34'82"E, alt. 4 m, 28.iii.2006, Wen-Xuan Bi leg.; 8 exs, (cSXB), ditto, but 5.ii.2009, Song & Ding leg. / all paratypes, labeled 'Paratype [yellow], Eustra shanghaiensis sp. nov. Song det. 2017'.

Comparative notes.

Eustra shanghaiensis sp. n. is closely allied to E. hammondi Deuve, 2001 from Mindanao, Philippines in sharing similar body size, general habitus and aedeagal structure (Figs 1A, 3A). The new species can be readily separated from latter by the pronotal front angles strongly produced, the wider aedeagus, the apex of aedeagal median lobe much shorter and wider and the relatively long apical portion of right paramere. It differs from its Shanghainese congener E. chinensis by the smaller body size and the different shape of aedeagus.

Description.

Body (Fig. 1A) 3.06-3.17 mm; yellowish-brown, head and pronotum somewhat reddish; each elytron with a dark spot.

Head (Fig. 2A) convex, gently covered with yellow setae, microsculpture faint; fully carinate near eyes; clypeus anteriorly gently concave, with 2 pairs of long setae at anterior margin; labrum with anterior margin minutely denticulate, with 12-14 long setae; Eyes somewhat small; antennae (Fig. 2B) submoniliform, with antennomeres I and II clavate, increasing in diameter distally gradually; antennomere I somewhat shorter than 2nd and 3rd combined; antennomeres V–X almost as wide as long; antennomere XI evidently longer than the 1st.

Pronotum (Fig. 2C) sparsely covered with yellow setae; distinctly wider than long, widest at apical third; moderately contracted anteriorly and posteriorly; disc moderately convex medially and reflexed on lateral sides; front angles strongly produced; midline distinct, almost reaching both anterior and posterior borders.

Pterothorax shaped as in Fig. 2E, meso-coxae disjunct, meta-coxae separated in midline of body.

Elytra (Fig. 2F) densely punctulate and pubescent, distinctly wider than prothorax; shoulders rounded and not bordered; each side with an obscurely dark spot; surface moderately covered with short setae, but along the right side of dark spot glabrous.

Hind wings well developed.

Legs (Fig. 1A) relatively long and slender; both spurs of pro-tibiae (Fig. 2D) are terminal, almost equal in length.

Male. Sternite VII (Fig. 3E) wide, widely truncate, slightly acute at middle, with 4 long setae near apex. Median lobe of aedeagus shaped as in Fig. 3A, ends in a blunt tip, with a spoon-shaped sclerite on endophallus; right paramere (Fig. 3B) arcuate, apical portion narrow and elongate; left paramere shaped as in Fig. 3C, large, almost glabrous, rounded at apex.

Female. Gonopod IX shaped as in Fig. 3D.

Comments.

Moore et al. 2011 described and illustrated the larval structure of Eustra chinensis based on larval specimens collected together with some adults from Tianshan Park, Shanghai with no association ants (Fig. 6A). However, all these specimens are now reconsidered as larvae of the new species, Eustra shanghaiensis sp. n. described here.

Measurements.

BL, 3.06-3.17; HW, 0.71-0.76; PL, 0.52-0.57; EL, 1.89-1.92.

Distribution.

China: Shanghai.

Biological notes.

Both adults and larvae are collected under rotten wood or bark during the whole year in Shanghai.

Symbiotic host.

Free living, not associated with ant.

Etymology.

Named after its type locality of Shanghai Latinized.