Diuncus javanus

Taxonomic history

Xyleborus javanus Eggers, 1923: 188.

Diuncus javanus (Eggers): Hulcr and Cognato, 2009: 32.

Synonyms

Xyleborus perdix Schedl, 1939a: 351. Schedl, 1960b: 109.

Diagnosis

2.5−2.7 mm long (mean = 2.62 mm; n = 5); 2.08−2.25 times as long as wide. This species can be distinguished by the elytralelytral:
pertaining to the elytra
summit transversely impressedimpressed:
a depression in a surface
with a saddle-like depression; declivitaldeclivital:
pertaining to the elytral declivity
basebase:
point or edge closest to the body; opposite of apex
armed by two pairs of denticlesdenticle:
a small tooth, the sides of which are equal and the tip is above the middle of the base
, one pair on interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
2 and the other on interstriaeinterstria:
longitudinal spaces along the elytra between the striae, which is not as<br /> impressed and bear smaller punctures.
3; bicolored elytraelytron:
the two sclerotized forewings of beetles that protect and cover the flight wings
and pronotumpronotum:
the dorsal surface of the thorax
that are darker on the apicalapex:
point or edge furthest from the body; opposite of base
areas; interstrial setaeseta:
small hair-like or scale-like structure
recumbentrecumbent:
pertaining to setae that are flat against the cuticle
, thick, scale-like, in uniseriate rows; and striaestria:
punctures in rows, which may or may not be impressed to make grooves
glabrousglabrous:
smooth, devoid of vestiture
.

May be confused with

Diuncus corpulentus and D. dossuarius

Distribution

Brunei, Indonesia (Java, Sumatra, Sulawesi), East & West Malaysia, Philippines, Thailand

Host plants

polyphagous (Kalshoven 1959bKalshoven 1959b:
Kalshoven LGE. 1959b. Studies on the biology of Indonesian Scolytoidea 4. Data on the habits of Scolytidae. Second part. Tijdschrift voor Entomologie 102: 135-173 + pls. 15-22., Browne 1961aBrowne 1961a:
Browne FG. 1961a. Borer beetles from Bako National Park (Sarawak). Sarawak Museum Journal 10: 300-318.)

DNA data

specimens not available for sequencing