Lebioderus sinicus, Song & Maruyama & Peng, 2017

Song, Xiao-Bin, Maruyama, Munetoshi & Peng, Zhong, 2017, Discovery of the genus Lebioderus (Coleoptera, Carabidae, Paussinae) from China, with description of two new species, Zootaxa 4344 (1) : -

Lebioderus sinicus Song and Maruyama, new species

( Fig. 1A )

Type material. Holotype: ♂ (SNUC), labeled ‘CHINA: Guangxi, Hechi City, Huanjiang Maonan A. C. (环江毛南族自 治县), Si’en Town (思恩镇), Sanle Vill. (三乐村), N24.823003, E108.245072, alt. 200m, 23-iv-2017, You Huang leg. [from a colony of Carebara sp.]. / HOLOTYPE [red], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017’.

Paratypes, 42 exs. in total; Guangxi (38 exs): 1 ♂, 6 ♀, 1 ex (cSXB), 1 ex (KUM), 7 ex (cHL), s labeled ‘CHINA: Guangxi, Hechi City, Huanjiang Maonan A. C. (环江毛南族自治县), Si’en Town (思恩镇), Sanle Vill. (三乐村), N24.823003, E108.245072, alt. 200m, 23-iv-2017, You Huang leg. [from a colony of Carebara sp.]. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017; 3 exs (cHL), labeled ‘CHINA: Guangxi, Hechi City, Huanjiang Maonan A. C. (环江毛南族自治县), Si’en Town (思恩镇), Sanle Vill. (三乐村), N24.823003, E108.245072, alt. 200m, 220- iv-2017, You Huang leg. [from a colony of Carebara sp.]. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017; 4 exs (cLYJ), labeled ‘CHINA: Guangxi, Hechi City, Bama Yao A. C. (巴马瑶族自 治县), Tangcaitun (塘才屯), Namapo (那马坡), 5-iii-2017 / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017; 2♂, 1♀, (SNUC), 5♀♀ (cSXB), 1♀ (KUM), 1♀ (BGUB), labeled ‘CHINA: Guangxi, Hechi City, Du’an Yao A. C. (都安), Qixingshan (七星山), alt. 150m, 20-iv-2017 [from colony of Carebara sp.]. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017’; 3 exs (cBNX), labeled ‘CHINA: Guangxi, Hechi City, Du’an Yao A. C. (都安), Qixingshan (七星山), alt. 150m, 6-iii-2017 [from colony of Carebara sp.]. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017; 1♂, 1♀ (cTZY), labeled ‘CHINA: Guangxi, Hechi City, Huanjiang Maonan A. C. (环江毛南族自治县), Si’en Town (思恩镇), Sanle Vill. (三乐村), N24.823003, E108.245072, alt. 200m, 22-iv-2017, You Huang leg. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017; Guangdong (4 exs: 1♀ (cSXB), labeled ‘China, Guangdong, Shenzhen, Wutongshan (梧桐山), nr. Dawang Vill. Gate (大望村口), 22°35′22″N, 114°11′45″E, alt. 200m, 7-x-2014, Zu-Qi Mai leg. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017’; 1♀ (cBNX), 1 ex (cLYJ) labeled ‘China, Guangdong, Shenzhen, Yantian District (盐田区), Xiao Wutongshan (小梧桐山), 22°34′15″N, 114°11′20″E, alt. 600m, 2.iv.2016, Tang & Lin leg. [from colony of Carebara sp.]. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017’; 1♀ (cSXB), labeled ‘China, Guangdong, Shenzhen, but, Wutongshan (梧桐山), 22°34′06″N, 114°13′15″E, alt. 300m, 8.viii.2016, Xiao-Bin Song leg. [from colony of Carebara sp.]. / PARATYPE [yellow], Lebioderus sinicus sp. nov., Song & Maruyama det. 2017’, pinned cards with 6 ants (3 workers and 3 soldiers).

Additional material. Yunnan: 2 exs (cHL), labeled ‘China, Yunnan, Xishuangbanna, Menghai County, Gelanghe Town (格朗和乡), Nannuoshan Vill. (南糯山村), Guniang Zhai (姑娘寨), N21.951723, E100.595198, alt. 1495m, 8.vii.2017, Biao Fan leg. [from a colony of Carebara sp.]. / Lebioderus sinicus Song & Maruyama det. 2017’.

Diagnosis. The new species is closely allied to L. thaianus Maruyama, 2008 ( Fig. 1B ) from Thailand in general habitus. L. sinicus sp. nov. can be readily separated from L. thaianus by the slenderer 1 st dorsal antennal denticle, the slightly longer antennal 2nd dorsal denticle, shoulders of pronotum more convex and metatibia almost straight ( Fig. 2C ).

Description. Body ( Fig. 1 ) 4.66–7.12 mm; reddish-brown, but mouthparts and legs slightly paler.

Head ( Fig. 1 ) with shallow longitudinal groove along the midline; frons almost rounded, slightly convex apically; temples weakly protruded laterad; dorsal surface sparsely covered with minute, recumbent setae; eyes large, somewhat prominent; neck narrow, strongly constricted.

Antennae ( Fig. 2A, B ) with segment I parallel-sided; antennal club not articulated except for 1 st article ; posterior margin with five produced denticles, 2nd to 5th dorsal denticles apically with short trichome brush; anterior margin with 1st to 4th projections shallowly emarginate, 5th ventral projection small, sometimes almost fused with 4th ventral projection ( Fig. 2B : arrow), 6th ventral projections minutely convex; each projection with a few short setae at apex; surface sparsely covered with minute, recumbent setae.

Pronotum ( Fig. 1 ) broad, about 2.13 times as wide as long; distinctly wider than head; divided by a transverse cleft; without longitudinal groove; shoulders gently convex; lateral projection well developed, rounded at apex; disc sparsely covered with minute, recumbent setae.

Elytra ( Fig. 1 ) with 7 to 12 pairs of long setae on lateral margins of apical half; shoulders well protruded; surface sparsely covered with minute, recumbent setae.

Legs ( Figs. 1 , 2 C-D) thin; tibiae nearly straight; tarsi slender, sparsely covered with short setae.

Male. Pygidium with sharp edge, with a few short setae at apex; disc smooth, sparsely covered with minute, recumbent setae. Aedeagus shaped as in Fig. 2E .

Female. Pygidium with a more pronounced triangular shape.

Measurements. BL, 4.66–7.12; HW, 1.22–1.57; ACL, 1.26–1.73; PL, 0.72–1.02; PW, 1.70–2.18; EL, 3.50–4.84.

Etymology. Name after China.

Distribution. China (Guangdong, Guangxi, Yunnan).

Biology. Individuals of Lebioderus sinicus were collected from colonies of Carebara ant( Fig. 5A ). The ant nests were located under rock or at the bottom of trees and most adults were found at chambers containing ant larvae. The adults were not injured by the alarmed ants. One specimen from Wutongshan ( Fig. 5B ) was found under the streetlight at night.

Host ant. Carebara sp.

Figures

FIGURE 1. Dorsal habitus of Lebioderus species. A. L. sinicus sp. n., female (Paratype). B. L. thaianus (Paratype, Photograph by M. Maruyama). Scale = 1 mm.

FIGURE 2. Diagnostic features of Lebioderus sinicus sp. nov. A. Antennal club. B. Antennal club, 4 th and 5 th ventral projections almost fused. C. Mesotibia and metatarsus. D. Hindtibia and hindtarsus. E. Aedeagus (holotype), dorsal view. Scales: A – E = 0.5 mm.

FIGURE 5. A. Lebioderus sinicus with Carebara ants. B. Wutongshan, Shenzhen, Guangdong, China. C. L. maolanus, sifted from leave litter. D. Type locality of L. maolanus (Maolan, Guizhou).