Arixyleborus yakushimanus
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Arixyleborus yakushimanus lateral; R.K. Osborn |
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Arixyleborus yakushimanus dorsal; R.K. Osborn |
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Arixyleborus yakushimanus declivity; R.K. Osborn |
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Arixyleborus yakushimanus frontal; R.K. Osborn |
Taxonomic history
Xyleborus yakushimanus Murayama, 1955: 83.
Arixyleborus yakushimanus (Murayama): Nobuchi, 1985: 28.
Diagnosis
2.0−2.2 mm long (mean = 2.08 mm; n = 5); 2.5−2.75 times as long as wide. This species is distinguished by the protibiaprotibia:
tibia of the first pair of legs
posterior face inflatedinflated:
blown up; distended
and granulate; antennalantennal:
pertaining to the antennae
club broader than tall; posterolateralposterolateral:
relating to end of the side part/portion
carinacarina:
an elevated ridge or keel, not necessarily high or acute
costate; pronotumpronotum:
the dorsal surface of the thorax
laterallateral:
pertaining to the side
margin distinctly costate, nearly carinate; pronotumpronotum:
the dorsal surface of the thorax
anterioranterior:
the front or forward; opposite of posterior
margin elevated with a row of serrations; strial furrows equal in width to interstrial ridges on discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
; interstrial ridges glabrousglabrous:
smooth, devoid of vestiture
or with minute setaeseta:
small hair-like or scale-like structure
no longer than ½ with of a strial furrow; interstrial ridges finely tuberculate; striaestria:
punctures in rows, which may or may not be impressed to make grooves moderately impressedimpressed:
a depression in a surface
; elytralelytral:
pertaining to the elytra
declivitydeclivity:
downward slope of either the pronotum or elytra
strongly shagreenedshagreened:
covered with a closely-set roughness, like shark skin 
; and moderate size.
May be confused with
Arixyleborus grandis, A. malayensis, and A. tuberculatus
Distribution
China (Fujian, Sichuan, Xizang, Yunnan), India (Bihar, West Bengal), Japan, Laos, Taiwan, Thailand, Vietnam
Host plants
recorded from Castanopsis (Fagaceae) and Machilus (Lauraceae) (Yin et al. 1984Yin et al. 1984:
Yin H-F, Huang F-S, Li Z-L. 1984. Economic insect fauna of China. Fasc. 29. Coleoptera: Scolytidae. Science Press, Beijing, x + 205 pp., XVII Tab. (Chinese with English abstract))
DNA data
Sequences available for COI and CAD.
