Charaea dinhcuongi Nguyen, 2021

Nguyen, Dinh T, Ho, Loan Thi & Nguyen, Son Giang, 2021, Description of a new species of the Charaea coomani group (Coleoptera: Chrysomelidae: Galerucinae) from Vietnam with a key to species, Biodiversity Data Journal 9, pp. 72158-72158 : 72158

Charaea dinhcuongi Nguyen, 2021 sp. n.

Materials

Type status: Holotype. Occurrence: occurrenceDetails: http://www.boldsystems.org/index.php/API_ Public /specimen?bin=BOLD:AEH1826; catalogNumber: IEBR ; recordedBy: Dinh T. Nguyen, Trinh Dinh Cuong; individualID: Gal _81_2019; individualCount: 4; sex: 3 Males, 1 female; lifeStage: adult; preparations: whole animal; disposition: in collection of author; associatedSequences: Genbank : MW407948.1; Taxon : scientificName: Charaea dinhcuongi Nguyen , 2021; phylum: Arthropoda ; class: Insecta ; order: Coleoptera ; family: Chrysomelidae ; genus: Charaea ; Location : locationID: Ba Tan moutain, Phu Quoc district ; higherGeographyID: Phu Quoc Islands , Kien Giang province; higherGeography: Vietnam, Kien giang Province,; continent: Asia ; island: Phu Quoc ; country: Vietnam; countryCode: VN; stateProvince: Kien Giang; verbatimElevation: 101 m a.s.l.; verbatimLatitude: 10.24105 N; verbatimLongitude: 103.96967 E; verbatimCoordinateSystem: decimal degrees; Event : samplingProtocol: beating; samplingEffort: beating tree canopy in the paths in forest in 8 hours/day in two weeks/ time * 2times, 50 km by motobike; year: 2019; month: July ; day: 9; habitat: forest; Record Level : type: life specimens; institutionID: IEBR; institutionCode: Institute of Ecology and Biological Resources; collectionCode: NAFOST.106.09-2019; basisOfRecord: livingSpecimen

Description

Measurements. Males: 3.86-3.90 mm, female: 3.60 mm. Body oblong, convex, slightly broadened posteriorly, 1.72 times as long as wide. The dorsal side is glabrous, oval, convex. Colour bluish-black, abdomen yellowish-brown; mandibles black; labrum black; Antennae with antennomeres I-III bluish-black and IV-XI black; legs black with femora lustrous and bluish-black (Fig. 1).

Male (Fig. 2 a, b): Labrum transverse, anterior margin not emarginate in middle and with four thin pale setae; in the middle of the labrum with six setae arranged in a horizontal row, lateral margins rounded and convergent. Clypeus transverse and small, anterior margin of clypeus straight with few long setae, impunctate. Frontal ridge large, convex, impunctate, transverse, isosceles triangular with the apex in the middle of two antennal callis. The frontal tubercles separated from the vertex by a distinct transverse furrow. Eyes are large, strongly convex. Interantennal space is twice as wide as the transverse diameter of the antennal socket and interocular space is twice as wide as the transverse diameter of the eye. Antennae is robust, slightly longer than half body length, length ratio of antennomeres equals: 100: 53: 73: 105: 105: 105: 105: 116:116: 137 9.5: 5: 7: 10: 10: 10: 10: 10: 11: 11: 13, antennomeres I-III lustrous, covered with sparse setae, antennomeres IV-XI dull, covered with dense short setae.

Pronotum (Fig. 2 c) is strongly convex, oval, without any discal impressions, 1.32 times as wide as long, broadest in middle. Disc of pronotum, covered with two kinds of punctures, sparse fine punctures cover the whole surface, sparse larger punctures are cumulated in two wide longitudinal stripes. Anterior margin concave, posterior margin convex, lateral margins rounded. Anterior margin unbordered, posterior margin thinly bordered, lateral borders distinctly wider; anterior angles swollen, posterior angles obtusangulate. All angles with large setigerous pore-bearing long seta, additional short setae visible on lateral margins in anterior half.

Scutellum glabrous, bluish-black, impunctate and triangular.

Elytra 1.36 times as long as wide, widest at near apex; elytral disc glabrous and densely covered with moderately large confused punctures. Humeral calli well developed. Epipleura strongly broadened at base, gradually narrower to middle and disappearing at apical third.

Legs (Figs 1 b, d, 2 e, f) slender. All tibiae with an apical spur in both sexes. Tarsomeres I elongate, subparallel, tarsomeres II subtriangular. Ventral sides of pro-and mesotarsomeres I with large sensilla patch (Fig. 12). Length ratio of protarsomeres and mesotarsomeres I-IV equals 10: 6: 5: 11, protarsomere and mesotarsomere I 2.1 times as long as wide. Length ratio of metatarsomeres I-IV equals 12: 7: 6: 14, metatarsomere I 3.0 times as long as wide. Claws appendiculate. Anterior coxal cavities open posteriorly. Prosternal process very narrow, not visible between procoxae. Mesosternum free, not covered by a process of metasternum. Head ventrally, pro- and mesoventrite lustrous, glabrous and impunctate. Mesepisterna, mesepimera, metaventrite,and metepisterna covered with dense short setae.

Abdomen (Figs 1 b, d, 2 d) yellow, covered with dense short setae with five distinctly visible ventrites; hind margins of first to third ventrite straight and fourth ventrite concave; last ventrite trilobed, middle lobe with straight cut apex, its surface slightly impressed throughout. Pygidium convex with round apex.

Aedeagus (Fig. 3 a, b, c) length 1.74 mm, with apex forming apical process, two lateral sides of the process narrow in the middle, apex with small emargination in middle and lateral view is straight. Internal sac with two lateral sclerites, long, convergent and sharp apices (Fig. 3 d, e).

Female similar to male (Fig. 1 c, d), but ventral sides of pro- and mesotarsomeres I without sensilla patch. Posterior margin of the last ventrite triangular. Pygidium with round apex. Spermatheca with nodulus distinctly wider than cornu, cornu C-shaped, proximal spermathecal duct almost straight as in Fig. 4 a. Sternite VIII pentagonal, tignum slender, 1.5 times longer than sternite VIII as in Fig. 4 b.

Diagnosis

Charaea dinhcuongi sp. nov. is similar to the species having a long apical process of aedeagus ( C. kelloggi (Gressitt & Kimoto, 1963), C. latha Bezděk, 2017 and C. mimicum (Medvedev, 1998)). In Charaea dinhcuongi sp. nov., the apical process of the aedeagus with two lateral sides narrow in the middle, apex with small emargination in the middle, in the lateral view the process is straight. In C. kelloggi , the apical process of the aedeagus is convergent, with apex narrow and rounded. In C. latha , the apical process of the aedeagus is wide with apex transversely cut and, in lateral view, the process is widely round and bent up. In C. mimicum , the apical process of the aedeagus is longer with the apex truncate.

The shape of internal sclerites (long with sharp apices) in Charaea dinhcuongi sp. nov. is very similar in to C. kelloggi (Gressitt & Kimoto, 1963), C. latha Bezděk, 2017, C. coomani (Gressitt & Kimoto, 1963) and C. mimicum (Medvedev, 1998). The species C. coomani has a subtriangular aedeagus apex.

Etymology

Dedicated to Trinh Dinh Cuong, who helped me collect specimens.

Distribution

Phu Quoc Island, Kien Giang Province, southern Vietnam.