Dymasius borneoensis Miroshnikov et Heffern, 2020

Miroshnikov, A. I. & Heffern, D. J., 2020, The longicorn beetle tribe Cerambycini Latreille, 1802 (Coleoptera: Cerambycidae: Cerambycinae) in the fauna of Asia. 13. A new species of the genus Dymasius J. Thomson, 1864 from Borneo, Russian Entomological Journal 29 (2), pp. 184-186 : 184-186

Dymasius borneoensis Miroshnikov et Heffern , sp.n.

Figs 1, 4, 5 .

MATERIAL. Holotype ♀ (cDH) ( Fig. 1 ), E Malaysia, Sabah, Ranau , 1000 m, 5.05.2012 (local collector).

COMPARATIVE MATERIAL. Dymasius hefferni Holzschuh, 2005 : holotype ♂ (cCH) (photograph); 1♂ ( NHMD), E Malaysia, Sabah, Trus Madi Mt. , 28.III.2000 , local collector, “ Dymasius hefferni Holz. Ole Mehl det. 2005”; 1♂, 1♀ ( NHMD), same labels, but III.2003 ; 1♂ (cAM), same labels; 1♀ ( NHMD), same labels, but III.2005 ; 1♂, 4♀, ( Fig. 2 ) ( NHMD), same locality, but IV.2014 , local collector, “ Dymasius hefferni Holz. O. Mehl det. 2014”; 1♀ (cAM), same labels; 1♀ ( NHMD), E Malaysia, Sabah, Crocker Range , III.2005 , local collector, “ Dymasius hefferni Holz. Ole Mehl det. 2005”; 1♂ (cAM), E Malaysia, Sabah, Trus Madi Mt. , 1250 m, 05° 26´35´´ N / 116° 27´5´´ E, 22–26.V.2014, leg. A. Klimenko.

How to cite this article: Miroshnikov A.I., Heffern D.J. 2020. The longicorn beetle tribe Cerambycini Latreille ,

Dymasius nimbatus Holzschuh, 1991 : holotype, ♀ (cCH) (photograph; Fig. 3 ).

Dymasius vitreus Pascoe, 1885 : holotype, ♂ ( BMNH) ( Fig.6 ), “ N. Borneo ”, “ Dymasius vitreus Pasc. Type”, “Type”, “Pascoe Coll. 93– 60.”, “ Dymasius vitreus Pasc. N. Borneo ” ; 1♂ ( NHMD), E Malaysia, Sabah, Crocker Range , III.2005, local collector, “ Dymasius vitreus Pasc. Holzschuh det. 2006” ; 1♀ ( NHMD), same locality, but taken on IV.2005, local collector, “ Dymasius vitreus Pasc. Ole Mehl det. 2007” .

DIAGNOSIS. By the habitus, this new species resembles D. hefferni Holzschuh, 2005 , but is distinguished through the clearly less coarse folds on the pronotal disc, the significantly smaller, relatively homogeneous puncturation of the elytra, the more slender body, the clearly longitudinal antennomere 2, the shape of the elytral apex, the length ratio of antennomeres 4–6, and some other traits. Dymasius borneoensis sp.n. can also be compared to D. nimbatus Holzschuh, 1991 (see Remarks below), but differs distinctly by the larger body size, the significantly darker coloration, the wider pronotum, the longitudinal antennomere 2, the somewhat peculiar, recumbent, light setation of the elytra. In addition, the new species is distinguished from the somewhat similar congener, D. vitreus Pascoe, 1885 , by the shape of the pronotum and elytra, including the apex of the latter, the more strongly elongate antennomere 2, the somewhat peculiar, recumbent, light setation of the dorsum.

DESCRIPTION. Female. Body length 18.5 mm, humeral width 4.2 mm. Eyes, part of mandibles, most of head dorsally and pronotal disc black; elytra mostly dark brown; coloration of remaining parts combines brown and reddish brown tones.

Head with a distinct, relatively short, median groove between upper lobes of eyes; antennal tubercles well-expressed; eyes moderately convex; submentum with coarse and rough punctures and in addition with transverse folds; genae moderately long; antennae slightly longer than body; length ratio of antennomeres 1–11, 34: 10: 39: 23: 38: 43: 43: 40: 39: 33: 33; antennomere 1 without cicatrix (apical carina), with clear dense punctures; antennomere 2 very distinctly longitudinal.

Pronotum barely transverse, 1.01 times as wide as long; base 1.25 times as wide as apex; disc weakly convex, with moderately coarse and rough, heterogeneous, partly sinuous, predominantly transverse folds.

Scutellum triangular, strongly narrowed towards apex.

Elytra nearly parallel-sided, 2.8 times as long as humeral width; mainly with a small, clear, very dense, partly heterogeneous puncturation; apical external angle obtuse-angled, but well-expressed, sutural angle feebly dentate.

Prosternum with distinct transverse groove in front of middle, with irregular, partly transverse folds; prosternal process without apical tubercle; mesosternal process between coxae 1.5 times as wide as prosternal process, without tubercle dorsally; metasternum and sternites with a small dense puncturation; metasternum with a median groove being more distinct in apical part; both last (visible) sternite and tergite widely rounded at apex.

Legs moderately long; femora and tibiae with a distinct longitudinal carina on sides; metatarsomere 1 clearly shorter than metatarsomeres 2 and 3 combined.

Recumbent setation of dorsum mainly silvery greyish, of venter greyish, forming on elytra an iridescent pattern and on pronotum a peculiar pattern, as in Figs 1, 4 ; more or less long, erect, light setae mostly developed on head, pronotum, apex of abdomen and partly on venter.

ETYMOLOGY. The epithet of this new species is formed on the basis of the name of the locality it supports.

DISTRIBUTION. East Malaysia.

REMARKS. A specimen of Dymasius from East Kalimantan, indicated as D. nimbatus [ Makihara, 1999], does not actually belong to this species and requires a detailed study to determine the correct species attribution. Thus, D. nimbatus remains known only from northern Thailand.

Acknowledgements. We are very grateful to Maxwell V.L. Barclay and Michael F. Geiser ( BMNH), Alexey Yu. Solodovnikov ( NHMD) for the opportunity to study the museum material, to Luboš Dembický (Brno, Czech Republic) who generously shared pictures of the holotypes of some Dymasius species, to Hiroshi Makihara ( Isumi , Chiba, Japan) for the helpful provision of literature data. We would also like to express our sincere thanks to Tatiana P. Miroshnikova (Krasnodar, Russia) for having rendered great help in the preparation of pictures .

Figures

Figs 1–6. Dymasius spp.: 1, 4, 5 — D. borneoensis sp.n.; 2 — D. hefferni; 3 — D. nimbatus (photograph by Luboš Dembický); 6 — D. vitreus; 1–3, 6 — habitus, dorsal view; 4 — head and pronotum, dorsal view; 5 — head, pro- and mesosternum, ventral view; 1, 3–6 — holotypes; 1–5 — ♀♀, 6 — ♂. Рис. 1–6. Dymasius spp.: 1, 4, 5 — D. borneoensis sp.n.; 2 — D. hefferni; 3 — D. nimbatus (фотографиЯ Л.Дембицкого); 6 — D. vitreus; 1–3, 6 — обЩий вид, сверху; 4 — голова и переднеспинка, сверху; 5 — голова, про- и меЗостернум, сниЗу; 1, 3–6 — голотипы; 1–5 — ♀♀, 6 — ♂.