Biodiversity Data Journal :
Taxonomic Paper
|
Corresponding author: Xingmin Wang (32457430@qq.com)
Academic editor: Li Ren
Received: 13 Aug 2021 | Accepted: 15 Sep 2021 | Published: 02 Dec 2021
© 2021 Wenjing Li, Bingxu Chen, Chantharath Toulakhom, Xingmin Wang
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Li W, Chen B, Toulakhom C, Wang X (2021) Two new species of Chilocorus Leach, 1815 from Laos (Coleoptera Coccinellidae Chilocorini). Biodiversity Data Journal 9: e72966. https://doi.org/10.3897/BDJ.9.e72966
|
|
Chilocorus Leach, 1815 the largest genus of Chilocorini, contains more than 80 species, mainly preying on Coccoidea. Many species of Chilocorus are economically important as they are widely used as biological control agents.
In this study, two new species of the genus Chilocorus Leach are described from Laos: C. toulakhomianus Li & Wang, sp. n. and C. vientianicus Li & Wang, sp. n. Diagnoses and detailed descriptions of the new species are given. Each species is illustrated in detail, including genitalia. Distribution maps are presented.
Coleoptera, Coccinellidae, Chilocorus, new species, Laos
Chilocorus Leach, 1815 the largest genus of Chilocorini, contains 81 species in the recent world checklist (
Untill now, there is scarce literature to investigate and research Coccinellidae species in Laos. Prior to the prsent study, except for C. politus Mulsant, 1850 (
Specimens, examined in this study, were collected in Laos. Type specimens of the new species are deposited at the Department of Entomology, South China Agriculture University (SCAU), Guangzhou.
External morphology was observed with a dissecting stereomicroscope (SteREO Discovery V20, Zeiss). Male and female genitalia were dissected, cleared in 10% solution of sodium hydroxide (NaOH) by boiling for several minutes and examined with an Olympus BX51 microscope. Photographs of the genitalia and other morphological characters were taken with digital cameras (AxioCam HRc and Coolsnap-Procf & CRI Micro*Color), attached to microscopes using AxioVision Rel. ver. 4.8 and Image-Pro Plus ver. 6.0. Images were cleaned up and laid out in plates with Adobe Photoshop CS ver. 8.0. Terminology follows
Abbreviations
TL = total length: length from apical margin of clypeus to apex of elytra; TW = total width: width across both elytra at widest part; TH = body height measured across the highest point of the elytra; HW = head width in a frontal view; PL = pronotal length: from middle of anterior margin to base of pronotum; PW = pronotal width at widest part; EL = elytral length: from apex to base including scutellum; EW = elytral width, equal to TW.
Chilocorus Leach, 1815: 116.
The genus Chilocorus can be distinguished from the other genera of the tribe Chilocorini by the following combination of characters: body with dorsum glabrous, rarely with pubescence; outer elytral margin slightly reflexed, without distinct bead; antenna stout, composed of 7 or 8 antennomeres (Fig.
Chilocorus toulakhomianus Li & Wang, sp. n. a dorsal view; b lateral view; c frontal view; d prothorax; e antenna; f maxilla; g mandible; h labium; i front leg; j hind leg; k tarsal claw; l abdomen; m penis; n apex of penis; o tegmen, lateral view; p tegmen, ventral view; q ovipositor. Scale bars: 0.1 mm.
TL: 4.80–6.00 mm, TW: 4.45–5.28 mm, TH: 2.88–3.32 mm, TL/TW: 1.08–1.14, PL/PW: 0.57–0.61, EL/EW: 0.97–0.99.
Body roundish, strongly convex. Head, mouthparts and antenna brownish-red, sparsely covered with short, greyish pubescence. Pronotum, scutellum and elytra glabrous, brownish-red (Fig.
Head relatively large, 0.52–0.54 times pronotal width, punctures on frons large and densely distributed, 0.5–1.5 diameters apart, surface polished between punctures. Eyes approximately oval, densely faceted, interocular distance 0.45× as wide as head (Fig.
Male genitalia: penis slender, penis capsule with long outer and short inner arm, with spiral texture from apical 1/5 to apical 1/3, apex of penis truncate with membranous appendage (Fig.
Female genitalia: coxites elongate, subtriangular, outer and inner margins almost straight, tapering to blunt apices (Fig.
This species is very similar to C. politus and species C. vientianicus, sp. n. in the body size and colouration, but can be distinguished from them by penis with spiral texture from apical 1/5 to apical 1/3; penis guide widest at base, gradually converging to apex in lateral view. Furthermore, this species also can be distinguished from C. vientianicus, sp. n. by coxites with straight outer and inner margins. In C. vientianicus, sp. n., coxites outer margin is almost straight, but inner margin is distinctly concave near apical 1/3.
The specific epithet is named after Toulakhom, the type specimen collector of this ladybird.
TL: 4.91–5.66 mm, TW: 4.58–5.35 mm, TH: 3.07–3.75 mm, TL/TW: 1.05–1.07, PL/PW: 0.54–0.57, EL/EW: 0.98–0.99.
Body roundish, strongly convex. Head, mouthparts and antenna brownish-red, sparsely covered with short, greyish pubescence. Pronotum, scutellum and elytra glabrous, brownish-red (Fig.
Head relatively large, 0.52–0.53 times pronotal width, punctures on frons large and densely distributed, 0.5–1.5 diameters apart, surface polished between punctures. Eyes approximately oval, densely faceted, interocular distance 0.47× as wide as head (Fig.
Male genitalia: penis slender, penis capsule with long outer and short inner arm, apex of penis truncate with membranous appendage (Fig.
Female genitalia: coxites elongate, subtriangular, outer margin almost straight, inner margin distinctly concave near apical 1/3 (Fig.
This species resembles C. toulakhomianus, sp. n. in the body size and colouration, but can be distinguished by the following characters: apex of penis truncate with membranous appendage, without spiral grain; penis guide widest at base, parallel along basal 5/8, after that abruptly converging to apex in lateral view; coxites elongate outer margin almost straight, inner margin distinctly concave near apical 1/3.
The specific epithet is named after Vientiane, the type locality of this ladybird.
Laos (Vientiane) (Fig.
The species deversity of Chilocorini have been investigated in detail in many countries of East and Southeast Asia, such as China, Japan, Vietnam etc (
The research was supported by the National Natural Science Foundation of China (31802003).