Xylosandrus discolor

Taxonomic history

Xyleborus discolor Blandford, 1898: 429.

Xylosandrus discolor (Blandford): Browne, 1963: 55.

Synonyms

Xyleborus posticestriatus Eggers, 1939b: 119. Dole and Cognato, 2010: 488.

Diagnosis

2.0−2.4 mm long (mean = 2.02 mm; n = 5); 2.0−2.29 times as long as wide. This species can be distinguished by its moderate size; elytralelytral:
'pertaining to the elytra
discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
flat, longer than declivitydeclivity:
downward slope of either the pronotum or elytra
; declivitaldeclivital:
pertaining to the elytral declivity
face steep, abruptly separated from discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
; elytraelytron:
' the two sclerotized forewings of beetles that protect and cover the flight wings
appearing obliquely truncateobliquely truncate:
'nearly truncate but rounded not flat in lateral view
; posterolateralposterolateral:
'relating to end of the side part/portion
margins of elytraelytron:
' the two sclerotized forewings of beetles that protect and cover the flight wings
carinate to interstriaeinterstria:
'longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
7; declivitaldeclivital:
pertaining to the elytral declivity
face with four apparent granulategranulate:
'pertaining to a coarse, grainy surface texture'
striae (striae 5 short, converging with striaestria:
punctures in rows, which may or may not be impressed to make grooves
4 forming a loop); declivitaldeclivital:
pertaining to the elytral declivity
face convexconvex:
appearing rounded
; declivitaldeclivital:
pertaining to the elytral declivity
striae setose, setaeseta:
small hair-like or scale-like structure
semi-recumbentsemi-recumbent:
pertaining to setae that are in between'erect and recumbent, usually at a 45 degree angle
hairs and equal to the width of an interstriainterstria:
'longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
; interstriaeinterstria:
'longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
granulategranulate:
'pertaining to a coarse, grainy surface texture'
, granulesgranule:
'a small rounded protuberance, like grains of sand
multiseriate, confusedconfused:
of markings, having indefinite outlines or running together as lines or spots without definite pattern; usually referring to punctures
, with a uniseriate row erecterect:
'pertaining to setae that have their apices directed away from the body and appear straight
bristles equal in length to the width of an interstriainterstria:
'longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
; strial granulesgranule:
'a small rounded protuberance, like grains of sand
at least two times larger than those of interstriae; pronotumpronotum:
'the dorsal surface of the thorax
longer than wide, from dorsaldorsal:
'of or relating to the upper surface; opposite of ventral
view conical frontally (type 6) and laterallateral:
'pertaining to the side
view taller (type 2), summitsummit:
highest point, used for pronotum and elytra, denotes the peak between pronotal frontal slope and disc, and between elytral disc and declivity
at basalbase:
point or edge closest to the body; opposite of apex
quarter, basalbase:
point or edge closest to the body; opposite of apex
quarter shagreenedshagreened:
covered with a closely-set roughness, like shark skin'
, dull, densely punctatepunctate:
'set with fine impressed points, appearing as pin pricks
; and broad, dense mycangial tuftmycangial tuft:
'tuft of setae that denotes the mycangia exterior opening
on the pronotalpronotal:
'pertaining to the pronotum
basebase:
point or edge closest to the body; opposite of apex
.

May be confused with

Xylosandrus beesoni, X. borealis, and X. diversepilosus

Distribution

From the Indian subcontinent and southern China through Southeast Asia and Indonesia west of Wallace’s line, Philippines, Taiwan. Presumably imported to Australia. Within the study region, recorded from China (Chongqing, Fujian, Guangdong, Guizhou, Hainan, Hong Kong, Jiangxi, Sichuan, Yunnan), India (Andaman Is, Assam, Karnataka, Meghalaya, Sikkim, Tamil Nadu, Uttarakhand, West Bengal), Laos, Myanmar, Taiwan, Thailand, Vietnam. Also recorded from Australia, Japan (Ryukyu Is.), Indonesia, Malaysia, New Guinea, Philippines, Sri Lanka.

Host plants

polyphagous (Dole and Cognato 2010Dole and Cognato 2010:
Dole SA, Cognato AI, 2010. Revision of Xylosandrus Reitter (Curculionidae: Scolytinae). Proceedings of the California of Science 61: 451-545.)

Remarks

The biology is described by Kalshoven (1959b) and Browne (1961a). Le Pelley (1968) notes that the species attacks green, living branches of coffee in Sri Lanka, but is not considered an important pest.

DNA data

Sequences available for COI and CAD.

COI: GU808721; GU808712; MN620080

CAD: GU808643