Research Article |
Corresponding author: Wisut Sittichaya ( wisut.s@psu.ac.th ) Academic editor: Miguel Alonso-Zarazaga
© 2023 Wisut Sittichaya, Anthony I. Cognato.
This is an open access article distributed under the terms of the CC0 Public Domain Dedication.
Citation:
Sittichaya W, Cognato AI (2023) Tricosa uniseriata, a new species of xyleborine ambrosia beetle from Thailand (Coleoptera, Curculionidae, Scolytinae, Xyleborini). ZooKeys 1153: 97-103. https://doi.org/10.3897/zookeys.1153.101985
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A new species, Tricosa uniseriata sp. nov., is described here. A list of Tricosa species found in Thailand with distributions and an updated key to Tricosa are also provided.
Ambrosia beetles, key, new species, Thailand, Tricosa, Xyleborini
The xyleborine ambrosia beetle genus Tricosa Cognato, Smith & Beaver, 2020 (Curculionidae, Scolytinae) contains six species (
Species | First record | Thai distribution |
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Tricosa cattienensis |
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N: Chiang Mai; N-E: Chaiyaphum; W: Phetchaburi; S: Surat Thani |
Tricosa indochinensis |
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N: Chiang Mai |
Tricosa metacuneolus |
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S: Chumphon, Nakhon Sri Thammarat |
Tricosa uniseriata sp. nov. | This publication | S: Narathiwat |
A specimen was collected from a small branch of Artocarpus integer (Moraceae) in the lowland tropical rain forest of the Hala-Bala Wildlife Sanctuary, Narathiwat province, Thailand. Photographs were taken with a Canon 5D digital camera with a Canon MP-E 65 mm macro lens (Canon, Tokyo, Japan) and StackShot-Macrorail (Cognisys Inc., MI, USA) The photos were then combined with Helicon Focus 6.8.0. (Helicon Soft, Ukraine), and all photos were improved with Adobe Lightroom classic (Adobe Systems, CA, USA). The antennal and pronotum types and characters follow those proposed by
Xyleborus metacuneolus Eggers, 1940.
Antennal funicle four-segmented; antennal club with one or two sutures visible on the posterior face; protibia distinctly or obliquely triangular with six or fewer denticles on outer margin and posterior face flattened and unarmed; scutellum small, flush with elytra surface; mycangial tufts absent; elytra attenuate; posterolateral costa absent.
Cryptoxyleborus, Cyclorhipidion, and Fraudatrix.
Holotype , female, Thailand, Narathiwat Province, Hala-Bala Wildlife Sanctuary, 5°48'02.4"N, 101°49'58.2"E, lowland tropical rainforest, 140 m a.s.l., 12.x.2021, ex. small branch of Artocarpus integer (W. Sittichaya) (NHMW, Naturhistorisches Museum Wien, Wien).
T. hipparion Smith, Beaver & Cognato, 2022.
This species is distinguished by its stoutness: 2.35 mm long, 2.40× as long as wide. The combination of the following characters is diagnostic: lateral margin of elytra feebly broadened apically; elytral disc convex; discal striae and interstriae uniseriate punctate; stria weakly impressed and interstriae elevated; anterior margin of pronotum with six moderate serrations.
(female). 2.35 mm long, 2.40× as long as wide. Body dark brown, except appendages yellowish brown. Body more robust, less elongate. Head: epistoma entire, transverse, lined with a row of short, hair-like setae. Frons flat from epistoma to middle level of eye, then slightly convex upward to vertex; lower portion of surface at medial line shagreened, subshining; sides of medial line glabrous, strongly shinning; upper portion shagreened, subshining; frons with widely separated, small granules, with each granule decorated with long, fine, hair-like setae. Eyes weakly emarginate above level of antennal insertion; upper portion of eyes slightly smaller than lower part. Submentum slightly impressed below genae, widely triangular at base. Antennal club type 3 (
Pronotum
: 1.0× as long as wide; elongate and parallel sided in dorsal view, type 7 (
Male. Unknown.
L. uniseriata: uni- = one; series = row. Refers to the arrangement of strial and interstrial punctures in one line. A variable adjective.
Thailand (Narathiwat Province).
The holotype was collected from a small branch of Artocarpus integer (Thunb.) Merr. (Moraceae).
Tricosa uniseriata is the smallest and stoutest Tricosa species. The proportion of this species’ body is 2.40× as long as wide as compared to the other species. The elytra are feebly widened 3/4 from the base and slightly tapered to apex as compared to T. hipparion where the elytra are parallel sided 2/3 from the base and tapered to the apex (
Modified from
1 | Elytral disc slightly convex without transverse impression | 2 |
– | Elytral disc deeply transversely impressed with a saddle-like depression | T. hipparion |
2 | Elytral discal striae and interstriae uniseriate punctate | 3 |
– | Elytral discal striae and interstriae punctures confused | 6 |
3 | Pronotum anterior margin unarmed, protibia broad, appearing distinctly triangular | T. jacula Cognato, Smith & Beaver, 2020 |
– | Pronotum anterior margin serrate, protibia narrow, appearing obliquely triangular | 4 |
4 | Discal striae and interstriae flat, body more elongate 2.53–2.78× as long as wide, elytra more tapering, apex broadly acute | 5 |
– | Discal striae feebly impressed, interstriae feebly elevate, body shorter and stouter 2.40× as long as wide, elytra less tapering, apex broadly round | T. uniseriata sp. nov. |
5 | Smaller in size, 2.40–2.50 mm, and declivital interstriae moderately setose | T. metacuneolus |
– | Larger, 3.80 mm, and declivital striae and interstriae densely setose | T. mangoensis |
6 | Pronotum anterior margin armed by a row of six serrations. Smaller, 2.70–3.10 mm long, and stouter, 2.50–2.70× as long as wide | T. cattienensis |
– | Pronotum anterior margin armed by a row of eight serrations. Larger, 3.20–3.40 mm long, and more slender, 2.83–2.91× as long as wide | T. indochinensis |
We are most grateful to Dr H. Schillhammer (NHMW) for access to specimens. We give special thanks to Mr Sunate Karapan, the senior author’s best friend, for his consistent support and facilitation of collecting specimens in Hala-Bala Wildlife Sanctuary as part of multiple research projects at various times. This research was supported by Faculty of Natural Resources Research Fund, and a Cooperative Agreement (IP00533923 to Anthony Cognato) from the United States Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS). It may not necessarily express views of APHIS.