Chaetocnema (Udorpes) latapronota 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 : 164-166

68. Chaetocnema (Udorpes) latapronota Ruan, Konstantinov & Yang , New Species

( Fig. 95 )

Etymology: This species is named after its wide pronotum. Specific epithet is a noun in apposition.

Distribution: Thailand, India, Pakistan.

Diagnosis: This species resembles C. cognata , and it differs from the latter by extremely weak humeral calli and longer pronotum (width to length ratio in C. cognata is 1.55–1.65, while the same in C. latapronota is 1.48–1.52), which is also different in shape. Shape of aedeagus are also similar in both the species. However, ventral longitudinal groove of aedeagus in C. cognata is parallel sided, while the same in C. latapronota is widened before middle.

It is also close to C. paragreenica and can be distinguished from the latter by the shape of aedeagus, highly reduced hind wings and extremely weak humeral calli.

Host plants: Unknown.

Description: Body length: 1.90–2.00 mm. Body width: 1.10–1.15 mm. Ratio of length of antenna to length of body: 0.56–0.59. Ratio of elytron length (along suture) to width (maximum): 2.40–2.45. Ratio of pronotum width (at base) to length: 1.48-1.52. Ratio of length of elytron to length of pronotum (along middle): 2.30–2.50. Ratio of width of elytra at base to width of pronotum at base: 1.00–1.05.

Dorsum and head bronzy, finely reticulate. Antennomeres completely yellow brown, with proximal 2 and distal 5 darker. Tarsi and tibiae red brown. Pro- and mesofemora light brown. Metafemora dark brown.

Head hypognathous. Frontal ridge wide and flat. Frons covered with closely placed punctures. Ratio of width of frontal ridge to width of antennal socket: 2.55–2.65. Frontolateral sulcus absent. Suprafrontal sulcus obsolete, with a small pit in middle. Orbital, supraantennal sulci weak. Frons evenly covered with medium sized, closely placed punctures and relatively short, white setae. Vertex flat, situated on same level as orbit, densely and evenly covered with small punctures. Punctures on vertex and orbit smaller than those on frons.

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 moderately developed, truncate and oblique. Lateral margins of pronotum slightly convex. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures 1–2 times smaller than distance between adjacent punctures.

Humeral calli extremely weak. Elytra with convex lateral sides. Scutellar row of elytral punctures geminate and confused. Second to eleventh rows of elytral punctures regular. Elytral interspaces between puncture rows slightly costate at sides.

First protarsomere slightly larger in male. Excavation on metatibia moderately deep. Large lateral denticle on metatibia obtuse. Metatibial serration proximal to large lateral denticle absent.

Aedeagus in ventral view more or less parallel sided, apex narrowing abruptly. Ventral longitudinal groove of aedeagus moderately developed. Ventral longitudinal ridge in middle of aedeagus absent. Apical denticle of aedeagus in ventral view well differentiated, narrow, truncate on top. Minute, transverse wrinkles on ventral side of aedeagus poorly developed or absent. Aedeagus in lateral view curved near base, straight at apex.

Types: Holotype: ♂ (in USNM): 1) INDIA: Assam, 6mi N Tinsukia , III–29–1944, D. E. Hardy; 2) Loan from USNMNH 2065634; 3 ) Holotype; 4) Chaetocnema latapronota sp. nov., Des. Yongying Ruan, 2016.

Paratypes: 2♀ ( USNM), Thailand, Lop Buri Airawan Mt. , 9.VII.1953, R. E. Elbel , Paratype, Chaetocnema latapronota sp. nov., Des. Yongying Ruan, 2016; 2♂ 3♀ ( USNM), India, Bombay, JC Bridwell coll., 16.IX.1924, Loan from USNMNH 2065634 , Paratype, Chaetocnema latapronota sp. nov., Des. Yongying Ruan, 2016; 4♂ 6♀ ( USNM), India, Mangalore, JC Bridwell coll., XI.1926, Loan from USNMNH 2065634 , Paratype, Chaetocnema latapronota sp. nov., Des. Yongying Ruan, 2016; 6♂ 5♀ ( USNM), India, Mangalore, J. C. Bridwell col. Nov , 26, Paratype, Chaetocnema latapronota sp. nov., Des. Yongying Ruan, 2016; 1♀ ( USNM), West Bengal ( India) Singur Nasibpur , 9 May, 1971 BBB Oppenheimer, Chaetocnema sp.1, C. R. Basu det , Paratype, Chaetocnema latapronota sp. nov., Des. Yongying Ruan, 2016; 2♂ 3♀ ( USNM), Pakistan, Punj., 16mile W Hasanabdal , 1450feet, 10.X.1977, collectors: Gary F. Hevel & Mushtaq Ahmad, Loan from USNMNH 2065634 , Paratype, Chaetocnema latapronota sp. nov., Des. Yongying Ruan, 2016.

Figures

FIGURE 95. Chaetocnema latapronota sp. nov. A Male habitus (Holotype). B Pronotum and peri-scutellar area (Paratype). C Head, frontal view (Paratype). D Aedeagus, ventral view (Paratype). E Aedeagus, lateral view (Paratype). F Apex of aedeagus, ventral view (Paratype).