Cnestus improcerus

Taxonomic history

Xyleborus improcerus Sampson, 1921: 33.

Xylosandrus improcerus (Sampson): Beaver, 1998: 183.

Cnestus improcerus (Sampson): Dole and Cognato, 2010: 529.

Diagnosis

2.7−3.3 mm long (mean = 3.04 mm; n = 5); 1.67−1.74 times as long as wide. This species can be distinguished by the presence of a mesonotal 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
; elytralelytral:
pertaining to the elytra
discdisc:
the flat central upper surface of any body part (e.g. pronotum and elytra)
very short; procoxae widely separated; elytralelytral:
pertaining to the elytra
declivitydeclivity:
downward slope of either the pronotum or elytra
bicolored, with the basalbase:
point or edge closest to the body; opposite of apex
half black and the apicalapex:
point or edge furthest from the body; opposite of base
half with a pale translucent area; declivitydeclivity:
downward slope of either the pronotum or elytra
flat; pronotumpronotum:
the dorsal surface of the thorax
type 1 when viewed dorsally; antennalantennal:
pertaining to the antennae
club type 2, with two sutures visible on posteriorposterior:
toward the rear end; opposite of anterior
face; antennalantennal:
pertaining to the antennae
funicle four-segmented; protibiaprotibia:
tibia of the first pair of legs
distinctly triangular; posterolateralposterolateral:
relating to end of the side part/portion
margin of elytraelytron:
the two sclerotized forewings of beetles that protect and cover the flight wings
moderately carinate from apexapex:
point or edge furthest from the body; opposite of base
to declivitaldeclivital:
pertaining to the elytral declivity
basebase:
point or edge closest to the body; opposite of apex
along interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
7; interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
punctate, setose, and ground vestitureground vestiture:
minute recumbent vestiture
absent.

May be confused with

Xylosandrus spp., Cnestus gravidus, C. mutilatus, and C. testudo

Distribution

‘Borneo’, Brunei, East & West Malaysia, Thailand

Host plants

recorded from Canarium (Burseraceae), Dipterocarpus (Dipterocarpaceae), and an unidentified genus of Lauraceae (Browne 1961bBrowne 1961b:
Browne FG. 1961b. The biology of Malayan Scolytidae and Platypodidae. Malayan Forest Records 22: 1-255.)

Remarks

Reported by Wood and Bright (1992) as occurring in India but no actual records have been found.

DNA data

Sequences available for COI and CAD.

COI: GU808715

CAD: GU808636