Xyleborinus tritus
Xyleborinus tritus holotype lateral; R.K. Osborn |
Xyleborinus tritus holotype dorsal; R.K. Osborn |
Xyleborinus tritus holotype declivity; R.K. Osborn |
Xyleborinus tritus frontal; R.K. Osborn |
Taxonomic history
Xyleborinus tritus 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): 360.
Diagnosis
2.2−2.5 mm long (mean = 2.33 mm; n = 4); 3.0−3.14 times as long as wide. This species is distinguished by the 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.
2 unarmed by tuberclestubercle:
a small knob-like or rounded protuberance of the exoskeleton
, granulesgranule:
a small rounded protuberance, like grains of sand
present on apicalapex:
point or edge furthest from the body; opposite of base
1/3 of discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
; odd numbered declivitaldeclivital:
pertaining to the elytral declivity
interstriae strongly convexconvex:
appearing rounded
, bases of denticlesdenticle:
a small tooth, the sides of which are equal and the tip is above the middle of the base
tumescent; and striaestria:
punctures in rows, which may or may not be impressed to make grooves
1 nearly convergent with striaestria:
punctures in rows, which may or may not be impressed to make grooves
2 on declivitaldeclivital:
pertaining to the elytral declivity
face, interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br />
impressed and bear smaller punctures.
2 not apparent.
May be confused with
Xyleborinus exiguus, X. huifenyinae, and X. perpusillus
Distribution
China (Yunnan), Laos, Vietnam
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
Sequences available for COI and CAD.
COI: OP617764
CAD: OP607193