Chaetocnema (Udorpes) paraumesaoi 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 : 179-182

75. Chaetocnema (Udorpes) paraumesaoi Ruan, Konstantinov & Yang , New Species

( Figs. 104 , 105 )

Etymology: This new species is named after its resemblance to C.umesaoi . Specific epithet is a noun in apposition.

Diagnosis: The new species strongly resembles C. umesaoi sp. nov. However, it differs from the latter by the following characters: smaller body size; peri-scutellar area of elytron is wider with more punctures; pronotal base obviously expanded and convex at middle; body strongly convex at sides, posterior end of body strongly narrowed and pointed; vertex with denser punctures, frontal ridge slightly wider. The new species is also close to C. modiglianii on external characters, however, they can be easily separated by the shape of aedeagus.

Distribution: Malaysia, India.

Host plants: Unknown.

Description: Body length 1.50–1.65 mm, body width 0.85–0.90 mm. Ratio of elytron length (along suture) to width (maximum): 2.20–2.25. Ratio of pronotum width (at base) to length: 1.50–1.55. Ratio of length of elytron to length of pronotum (along middle): 2.15–2.25. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.05–1.10. Ratio of maximum width of elytra to maximum width of pronotum: 1.30–1.40.

Dorsum coppery, rarely bronzy. Antennae slender, slightly reach beyond humeral callus. Antennomeres 1–5 more or less yellow brown, 6–11 brown, distal ones gradually turning darker. Tibiae and tarsi brown. Pro- and mesofemora brown. Metafemora deep brown.

Head hypognathous. Frontal ridge wide and flat, with numerous closely placed punctures. Frontolateral sulcus absent. Suprafrontal sulcus present, moderately developed. Ratio of width of frontal ridge to width of antennal socket (counting surrounding ridges): 1.95–2.10. Frons evenly covered with punctures. Vertex flat, situated on same level as orbit. Vertex evenly and closely covered with punctures, punctures more or less sparser in middle of vertex.

Base of pronotum without short longitudinal impressions. Deep row of large punctures at base of pronotum absent. Pronotal base strongly convex at middle.Area adjacent to mid basal margin of pronotum covered with punctures. Pronotum without shallow antebasal transverse impression. Lateral margins of pronotum strongly convex. Anterolateral and posterolateral prothoracic callosities poorly developed. Diameter of pronotal punctures subequal to distance between adjacent punctures.

Elytra strongly converging towards apex, with strongly convex lateral sides. Scutellar row of punctures tripled. Remaining rows of elytral punctures regular. Humeral callus poorly developed.

First male protarsomeres and mesotarsomeres strongly enlarged, obviously larger than those in females. Large lateral denticle on metatibia obtuse. Metatibial serration absent.

Apex of aedeagus narrowing abruptly in ventral view. Ventral longitudinal groove present. In ventral view, apical denticle not well developed. Minute transverse wrinkles on ventral side absent.Aedeagus in lateral view strongly and evenly curved.

Types: Holotype: ♂ ( USNM): 1) Malaysia, Sabah, Kinabalu National Park, Headquarters area , alt. 1560m, 7.IX.1983, G.F.Hevel & W.E.Steiner; 2 ) Holotype; 3) Chaetocnema paraumesaoi sp. nov., Des. Ruan, 2016.

Paratypes: 4♂ 10♀ ( USNM), South India, Western Ghats Karnataka Prov , env. Mudigere, 14.XI. 2003, 904m, river, N13°07'57", E75°32'41", leg. Konstantinov, Prathapan, Saluk , Paratype, Chaetocnema paraumesaoi sp. nov., Des. Ruan, 2016. 1♂ ( USNM), Malaysia, Sabah, Kinabalu National Park, Headquarters area , alt. 1560m, 7.IX.1983, G.F.Hevel & W.E.Steiner , Paratype, Chaetocnema paraumesaoi sp. nov., Des. Ruan, 2016.

Figures

FIGURE 104. Chaetocnema paraumesaoi sp. nov. Habitus, hand drawing.

FIGURE 105. Chaetocnema paraumesaoi sp. nov. A Holotype, habitus. B Pronotum and peri-scutellar area (Holotype). C Head, frontal view (Holotype). D Aedeagus, ventral view (Paratype). E Aedeagus, lateral view (Paratype). F Apex of aedeagus, ventral view (Paratype).