Tricosa hipparion Smith, Beaver & Cognato, 2022

Smith, Sarah M., Beaver, Roger A., Pham, Thai Hong & Cognato, Anthony I., 2022, New species and new records of Xyleborini from the Oriental region, Japan and Papua New Guinea (Coleoptera: Curculionidae: Scolytinae), Zootaxa 5209 (1), pp. 1-33 : 18-19

Tricosa hipparion Smith, Beaver & Cognato sp. nov.

( Figs 57–60 )

http://zoobank.org/ urn:lsid:zoobank.org:act:024CA706-3D66-4B20-9CA6-5E5B543A4DE2

Type material. Holotype, female: MALAYSIA, Sabah, Rhino Ridge, Danum Valley , 11.xi.2006, J. Hulcr, ex Burseraceae, SAX 503 [DNA voucher] ( NMNH).

GenBank. CAD: OP607245 .

Diagnosis. This species is distinguished by the elytral disc broadly, deeply transversely impressed with a saddlelike depression.

Similar species. Tricosa cattienensis Cognato, Smith & Beaver, 2020a , T. indochinensis Cognato, Smith & Beaver, 2020a .

Description (female). 3.1 mm long (n = 1); 2.81 mm × as long as wide. Head and pronotum ferruginous, elytra dark brown, legs and antennae light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface shagreened, dull, punctate; punctures above epistoma small, fine, shallow, punctures larger, deeper on frons. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum slightly impressed below genae, narrowly triangular. Scape regularly thick, shorter than club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 as long as pedicel. Club approximately circular and flat, type 3; segment 1 corneous, transverse on anterior face, occupying basal ~1/3; segment 2 narrow, corneous; segments 1 and 2 present on posterior face. Pronotum 1.09 × as long as wide. In dorsal view elongate and parallel sided, type 7, sides parallel in basal 2/3, rounded anteriorly; anterior margin with a row of six serrations. In lateral view elongate, disc longer than anterior slope, type 7, summit low, on apical 2/5. Anterior slope with densely spaced narrow asperities, becoming lower and more strongly transverse towards summit, bearing long, fine, erect hair-like setae. Disc subshiny, alutaceous, finely punctate, finely setose, setae short, erect, hair-like, some longer hair-like setae at margins. Lateral margins obliquely costate. Base transverse, posterior angles acutely rounded. Scutellum small, triangular, flat, flush with elytra. Elytra: 1.73 × as long as wide, 1.58 × as long as pronotum. Base transverse, margins oblique; humeral angles rounded; attenuate at apical half, apex broadly rounded. Disc broadly, deeply transversely impressed with a saddle-like depression, surface smooth, shining, unarmed; striae seriate punctate, punctures separated by less than one diameter of a puncture, glabrous; interstrial minutely uniseriate punctate, widely spaced, each with a long, erect seta 1.5 × as long as interstriae 2. Declivity occupying ~2/5 of elytra, gradual, face flat, opalescent; striae impressed, strial punctures as large as those of disc; interstriae impunctate, interstriae tubercles arranged in an alternating pattern of a small denticle followed by a large denticle, with the apices curved ventrad; interstrial setae as long or twice as long as those of disc. Posterolateral margins rounded and granulate. Legs: procoxae contiguous, prosternal posterocoxal piece conical, slightly inflated. Protibiae distinctly triangular, broadest at apical half, posterior face flat, unarmed; five large denticles present on outer margin of apical third. Meso- and metatibiae obliquely triangular, flattened, posterior face unarmed; metatibiae bearing eight moderate socketed denticles on outer margin.

Distribution. Malaysia (Sabah).

Host plants. The holotype was collected from Burseraceae .

Etymology. G. hipparion = little horse. In reference to the saddle-shaped elytra. Noun in apposition.

Figures

FIGURES 57‒60. Tricosa hipparion holotype, 3.1 mm. Dorsal, lateral, posterior oblique and anterior views.