Euwallacea

Type species

Xyleborus wallacei Blandford

Adapted from Robert J. Rabaglia et al. 2006, p. 1041-1042

Diagnosis

There are two species of this predominantly Asian genus now established in North America. The two species in North America are distinguished from other Xyleborina by the posterolateral margin of the declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
which is subacutelysubacutely:
moderately acutely shaped
elevated from the suturalsutural:
pertaining to a suture such as the elytral suture or midline between the two wings
apex to interstriaeinterstriae:
longitudinally arranged lines, often flat or raised, often having setae, and located between the striae on the elytron
seven. It can be distinguished from Xyleborus Eichhoff as well from its single recurvedrecurved:
bent backward or downward as a smiley face
suture on its posterior faceposterior face:
the side not visible when the club is elevated against the head or visible when the club is down and sensing a surface; it usually has no sutures
.

Description

These are species with body lengths of 1.9 to 3.8 mm. They are stout with almost quadratequadrate:
square or nearly so
elytraelytra:
the two external and hardened or sclerotized forewings of adult Coleoptera, often appearing leather-like in texture
, with proportions of 1.2 to 1.5 times as long as wide. The color varies from dark brown to black. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is as long as wide with asperitiesasperities:
pertaining to surface roughenings or dot-like elevations that are not pointed
on the anterior half and a serrate anterior margin. The declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
is strongly convex, margined by a subacutelysubacutely:
moderately acutely shaped
elevated line from its apex to interstriaeinterstriae:
longitudinally arranged lines, often flat or raised, often having setae, and located between the striae on the elytron
7, and has granulesgranules:
a small grain-like elevation
. The vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
is sparsesparse:
scattered, spread irregularly and some distance apart
and consists of erect hair-like setaehair-like setae:
setae that are thin and similar to a hair
on interstrial rows. The anterior margin of the compound eye is emarginated. The scapescape:
the first and basal segment of the insect's antennae
is longer than the 5-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
(last four segments are almost fused and are hard to distinguish). The clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
is obliquely truncateobliquely truncate:
pertaining to a structure abruptly and concavely cut
and has a single recurvedrecurved:
bent backward or downward as a smiley face
suture on its posterior faceposterior face:
the side not visible when the club is elevated against the head or visible when the club is down and sensing a surface; it usually has no sutures
. The procoxaeprocoxae:
extra segment occasionally preceding coxa (hip joint) of the first or anterior pair of legs of arthropods
are contiguouscontiguous:
sharing an edge or boundary; touching
.

Distribution

Asia; Introduced to Australia, Pacific Islands, Hawaii, Panama, and eastern United States

World fauna

Number of species: 53, Native species: 0, Introduced species: 2

Established exotic species

Euwallacea fornicatus is present in California and Florida.

Euwallacea validus is present in New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, West Virginia, North Carolina, and Louisiana.

Hosts

Albizia, Camellia, Hevea, Populus, Robinia, Shorea, Theobroma, Persea, Citrus, Punica