Chaetocnema (Udorpes) reteimpunctata Ruan, Konstantinov & Yang, 2019

Ruan, Yongying, Yang, Xingke, Konstantinov, Alexander S., Prathapan, Kaniyarikkal D. & Zhang, Mengna, 2019, Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini), Zootaxa 4699 (1), pp. 1-206 : 186-188

79. Chaetocnema (Udorpes) reteimpunctata Ruan, Konstantinov & Yang , New Species

( Fig. 108 )

Etymology: This species is named after the reticulated pattern throughout the dorsum (especially on the vertex) and the almost impunctate vertex. Specific epithet is a noun in apposition.

Diagnosis: This species is rather distinct amongst the Oriental Chaetocnema species in having extremely shallow punctures on vertex and strongly convex pronotum. It resembles the Palearctic species C. mannerheimii in the body shape, however, they differ by the nature of punctation of the head and elytra.

Distribution: Sri Lanka.

Host plants: Unknown.

Description: Body length: 2.30–2.55 mm. Body width: 1.30–1.45 mm. Ratio of length of antenna to length of body: 0.55–0.58. Ratio of elytron length (along suture) to width (maximum): 2.45–2.48. Ratio of pronotum width (at base) to length: 1.40–1.50. Ratio of length of elytron to length of pronotum (along middle): 2.67–2.70. Ratio of width of elytra at base (in middle of humeral calli) to width of pronotum at base: 1.08–1.12.

Dorsum bronzy, finely and strongly reticulate throughout. Antennomeres 1–4 dark yellow brown, 5–11 brown, with apical ones darkened. Tarsi and tibiae dark yellow brown. Pro- and mesofemora dark yellow brown, slightly darker than tibia. Metafemora dark brown, with strong bronzy luster.

Head hypognathous, strongly reticulated throughout. Frontal ridge wide and flat. Frons covered with dense punctures. Ratio of width of frontal ridge to width of antennal socket: 2.15–2.25. Frontolateral sulcus absent. Suprafrontal sulcus poorly developed, with a large pit in middle. Orbital sulcus deep, supraantennal sulcus deep, forming an oblique, straight line. Frons covered with large and distantly placed punctures and white setae. Vertex flat, situated on same level as orbit. Punctures on vertex barely visible, extremely shallow, leaving a longitudinal impunctate area in middle.

Pronotum strongly convex. Base of pronotum without short longitudinal impressions. Pronotal base evenly convex. Deep row of large punctures at base of pronotum absent. Area adjacent to mid-basal margin of pronotum covered with punctures. Anterolateral prothoracic callosity poorly developed, somewhat truncate. Lateral margins of pronotum very slightly convex, with maximum width near middle. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures 1.5–3 times smaller than distance between them.

Elytra with humeral callus well developed, lateral sides convex. Scutellar row of elytral punctures tripled and confused. Second to eleventh rows of elytral punctures regular. Interspaces between puncture rows slightly costate.

Excavation on metatibia not deep. Large lateral denticle on metatibia obtuse. Metatibial serration proximal to lateral denticle absent.

Spermatheca with receptacle sinuated. Spermathecal pump much shorter than receptacle, witth flat apex. Maximum width of receptacle situated near base. Vaginal palpus slightly narrowing from base till middle, rest of it nearly parallel sided. Anterior sclerotization of vaginal palpus slightly widening anteriorly. Posterior sclerotization longer than wide. Posterior sclerotization wider than anterior.

Type: Holotype: ♀ ( USNM), labels: 1) Ceylon: Rat. Dist. Madu vanwala nr. Kolonne, 17.X.1970, 1000’ O. S. Flint, Jr. 2) Chaetocnema sp.? det. G. Scherer. 3 ) Holotype. 4) Chaetocnema reteimpumctata sp. nov., Des. Yongying Ruan, 2016.

Paratype: 1♀ ( USNM) labels: 1) Ceylon: Rat. Dist. Panamure, 500’ vanwala nr. Kolonne, 15–21.X.1970, O. S. Flint, Jr. 2 ) Paratype. 3) Chaetocnema reteimpumctata sp. nov., Des. Yongying Ruan, 2016.

Figures

FIGURE 108. Chaetocnema reteimpunctata sp. nov. A Holotype, habitus. B Pronotum and peri-scutellar area of Holotype. C Head of Holotype, frontal view. D Spermatheca of Holotype.