Euwallacea testudinatus, Smith & Beaver & Cognato, 2020

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Euwallacea testudinatus sp. nov. Fig. 59A, B, G

Type material.

Holotype, female, China: S-Yunnan, Xishuangbanna, 23 km NW Jinghong, vic. Na Ban village (NNNR), 22°10'N, 100°39'E, 700-1000 m, v-vii.2009, L. Meng (NKME). Paratypes, female, as holotype (MSUC, 1; NKME, 2; RABC, 2); as previous except: 20 km NW Jinghong, Man Dian NNNR-office, 22°07.80'N, 100°40.05' E, 740 m, LFF, 24.v.2008, A. Weigel (NKME, 1).

Diagnosis.

2.8-2.9 mm long (mean = 2.86 mm; n = 5); 2.24-2.33 × as long as wide. This species is distinguished by the pronotum subquadrate (near type 3) in dorsal view, but only 0.89-0.97 × longer than wide, and more strongly truncate anteriorly; elytra with a weak basal carina, sides parallel in basal 2/3, then gradually incurved to broadly rounded apex; declivity beginning after basal 1/4, convex, weakly flattened across interstriae 1-2 in apical 1/4, declivital strial punctures shallow, very coarse, striae 2 very weakly impressed, interstriae granulate, interstriae 2 with two or three larger denticles in apical 1/4, declivital posterolateral margin carinate, never granulate; and protibiae with 9-11 socketed denticles.

Similar species.

Euwallacea fornicatus species complex ( E. fornicatior , E. fornicatus , E. kuroshio , E. perbrevis ), E. andamanensis , E. geminus , E. malloti , E. neptis , E. semirudis , E. velatus .

Description

(female). 2.8-2.9 mm long (mean = 2.86 mm; n = 5); 2.24-2.33 × as long as wide. Body dark brown. Legs and antennae brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface strongly shiny, median 2/3 smooth, impunctate, lateral 1/3 sparsely and finely punctate, setose; punctures bearing a long, erect hair-like seta. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum narrow, triangular, slightly impressed. Antennal scape regularly thick, as long as club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 as long as pedicel. Club longer than wide, flat, type 3; segment 1 corneous, transverse on anterior face, occupying basal 2/5; segment 2 narrow, corneous; segments 1-3 present on posterior face. Pronotum: 0.89-0.97 × as long as wide. In dorsal view subquadrate and parallel-sided, type 3, sides parallel in basal 4/5, narrowly rounded anteriorly; anterior margin transverse without serrations. In lateral view tall, type 2, disc flat, summit at midpoint. Anterior slope with densely spaced, large coarse asperities, becoming lower and more strongly transverse towards summit. Disc shiny, alutaceous with sparse, minute punctures, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles acutely rounded. Elytra: 1.46 × as long as wide, 1.5 × as long as pronotum. Scutellum broad, moderately sized, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge weakly carinate and unarmed by granules, humeral angles rounded, parallel-sided in basal 2/3, then gradually incurved to broadly rounded apex. Disc convex, shiny, striae not impressed, with large, shallow punctures separated by one diameter of a puncture, glabrous; interstriae flat, very sparsely finely punctate, punctures 1/3 size of strial punctures, each with a long, erect seta. Declivity occupying approximately 3/4 of elytra, gradual, face convex, shiny, weakly flattened across interstriae 1-2 in apical 1/4; declivital strial punctures shallow, very coarse, strial punctures as large as those of disc, striae 2 very weakly impressed; interstriae impunctate, granulate, interstriae 1 with one denticle, interstriae 2-4 with two or three larger denticles in apical 1/4. Posterolateral margin carinate, unarmed to interstriae 7. Legs: procoxae contiguous; prosternal coxal piece short, conical. Protibiae semi-circular, with rounded outer margin; posterior face smooth; apical 1/2 of outer margin with 9-11 large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margin evenly rounded with 11 small socketed denticles.

Etymology.

L. testudinatus = vaulted like a tortoise shell. Named in reference to its domed shaped elytra. An adjective.

Distribution.

China (Yunnan).

Host plants.

Unknown.

Figures

Figure 59. Dorsal, lateral and declivital view of Euwallacea testudinatus paratype, 2.8 - 2.9 mm (A, B, G), E. validus, 3.9 - 4.1 mm (C, D, H), and E. velatus, 2.8 - 3.6 mm (E, F, I).