Ambrosiophilus lannaensis, 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

Ambrosiophilus lannaensis sp. nov. Fig. 14C, D, J

Type material.

Holotype, female, Thailand: Chiang Mai, Doi Pui, 18°50'23"N, 98°53'53"E, 1200-1300 m, 2-BM-Jun-B-23 (2016), [vi.2016], S. Sanguansub et al., ex Butea monosperma (MSUC). Paratypes, female, as holotype except: 3-BM-Jun-B-26 (NHMUK, 1); as previous except: 2-CAJun-B-14, ex Castanopsis armata (QSBG, 1); as previous except: 4-CA-Jun-B-114 (RABC, 1); as previous except: 4-CA-Jun-B-8 (SSC, 1); as previous except: 4-CA-Jun-B-87 (SSC, 1); as previous except: 2-LT-Jun-B-91, ex Lithocarpus tenuinervis (SSC, 1); as previous except: Doi Pui, Chiang Khian Highl. Res. Stn, 27.vii.2013, S. Buranapanichpan, ex persimmon, Diospyros kaki (RABC, 1); as previous except: ex Mangifera indica (MSUC, 1); as previous except: Doi Pui, 1400 m, 25.v-2.vi.2006, W. Puranasakul, ex EtOH trap (RABC, 1).

Diagnosis.

1.95-2.05 mm long (mean = 2.01 mm; n = 5); 2.67-2.73 × as long as wide. This species is distinguished by all declivital interstriae granulate on upper 1/2 of declivity; pronotum from dorsal view conical and elongate (type 5), from lateral view type 7; pronotal disc shiny, punctures moderately fine and separated by several times their diameter; posterolateral margins of elytra rounded; lower part of declivity flattened; and declivital striae not impressed, interstriae finely, sparsely granulate on upper part of declivity only.

Similar species.

Ambrosiophilus atratus , A. caliginestris , A. satoi , A. wantaneeae .

Description

(female). 1.95-2.05 mm long (mean = 2.01 mm; n = 5); 2.67-2.73 × as long as wide. Body dark brown, antennae and legs light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface subshiny, punctate; punctures moderately dense, becoming shallower and sparser on reticulate upper part. Eyes deeply emarginate just above antennal insertion, upper part smaller than lower part. Submentum distinctly triangular, slightly impressed. Antennal scape regularly thick, approximately as long as club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular and flat, type 3; segment 1 corneous, transverse on anterior face, occupying approximately basal 1/3; segment 2 narrow, corneous; segments 1 and 2 present on posterior face. Pronotum: 1.13 × as long as wide. In dorsal view conical and elongate, type 5, sides almost parallel in basal 1/2, conical anteriorly; anterior margin without serrations. In lateral view elongate, disc longer than anterior slope, type 7, summit not pronounced, on anterior 1/3. Anterior slope with widely spaced, small coarse asperities, becoming lower and more strongly transverse towards summit. Disc subshiny with moderately dense small, deep punctures bearing short, fine, erect hair-like setae, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Elytra: 1.63 × as long as wide, 1.67 × as long as pronotum. Scutellum small, triangular, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 3/4, then broadly rounded to apex. Disc shiny, striae not impressed, with moderately coarse, shallow punctures separated by one width of their diameter, each bearing a short, semi-erect hair-like seta; interstriae flat, finely punctate, punctures more widely separated than those of striae, with fine, semi-erect setae. Declivity steep, strongly convex, shagreened; strial punctures larger than on disc, striae 1 and 2 very weakly impressed; interstriae unarmed by granules, each puncture bearing a moderately long, erect hair-like seta. Posterolateral margin rounded, unarmed. Legs: procoxae contiguous; prosternal coxal piece short, pointed. Protibiae slender, obliquely triangular, broadest at apical 1/3; posterior face smooth; apical 1/2 of outer margin with five large socketed denticles, their length longer than basal width. Meso- and metatibiae flattened; outer margins evenly rounded with seven large socketed denticles.

Etymology.

The specific name refers to the old Northern Thai kingdom 'Lan Na’. Latinized adjective.

Distribution.

Thailand.

Host plants.

This species is evidently polyphagous and is here reported from Mangifera indica ( Anacardiaceae ), Diospyros kaki ( Ebenaceae ), Butea monosperma ( Fabaceae ), Castanopsis armata , and Lithocarpus tenuinervis ( Fagaceae ).

Figures

Figure 14. Dorsal, lateral and declivital view of Ambrosiophilus indicus holotype, 2.4 mm (A, B, I), A. lannaensis holotype holotype, 1.95 - 2.05 mm (C, D, J), A. latisulcatus, 3.9 - 4.2 mm (E, F, K), and A. osumiensis, 2.3 - 3.2 mm (G, H, L).