Xyleborinus cuneatus

Taxonomic history

Xyleborinus cuneatus Smith, Beaver & Cognato 2020 (in Smith et al. 2020bSmith et al. 2020b:
Smith SM, Beaver RA, and Cognato AI. 2020b. A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China. ZooKeys 983: 1-442. https://doi.org/10.3897/zookeys.983.52630): 338.

Diagnosis

2.1−2.2 mm long (mean = 2.13 mm; n = 3); 3.14−3.23 times as long as wide. This species is distinguished by the elytraelytron:
the two sclerotized forewings of beetles that protect and cover the flight wings
parallel-sided in basalbase:
point or edge closest to the body; opposite of apex
half, tapering posteriorly; declivitaldeclivital:
pertaining to the elytral declivity
face with interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
1 and 2 unarmed by tubercles; elytralelytral:
pertaining to the elytra
declivitaldeclivital:
pertaining to the elytral declivity
face moderately sulcatesulcate:
deeply furrowed or grooved
; small body size; laterallateral:
pertaining to the side
declivitaldeclivital:
pertaining to the elytral declivity
margins moderately elevated, costate, bearing 4−6 pairs of large sharply pointed backwardly hooked denticlesdenticle:
a small tooth, the sides of which are equal and the tip is above the middle of the base
(often asymmetric); elytraelytron:
the two sclerotized forewings of beetles that protect and cover the flight wings
with small denticlesdenticle:
a small tooth, the sides of which are equal and the tip is above the middle of the base
on interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
1−4 extending anteriorly onto the discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
to at least the midpoint; strial punctures large; declivitaldeclivital:
pertaining to the elytral declivity
surface shagreenedshagreened:
covered with a closely-set roughness, like shark skin
, dull; and elongate body form.

This species is very similar to X. spinipennis and can be recognized by the smaller size and more elongate form, elytraelytron:
the two sclerotized forewings of beetles that protect and cover the flight wings
with small denticlesdenticle:
a small tooth, the sides of which are equal and the tip is above the middle of the base
on interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
1−4 extending anteriorly onto the discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
to at least the midpoint, and pronotumpronotum:
the dorsal surface of the thorax
more elongate, 1.22 times as long as wide.

May be confused with

Xyleborinus andrewesi, X. disgregus, X. jianghuasuni, X. sculptilis, X. speciosus, and X. spinipennis

Distribution

China (Yunnan), Thailand

Host plants

unknown (Smith et al. 2020bSmith et al. 2020b:
Smith SM, Beaver RA, and Cognato AI. 2020b. A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China. ZooKeys 983: 1-442. https://doi.org/10.3897/zookeys.983.52630)

DNA data

specimens not available for sequencing