Hylurgus

Type species

Bostrichus ligniperda Fabricius

Adapted from Lombardero 1994, p. 150-150

Diagnosis

Among the Tomicina, Hylurgus only shares the 6-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
with Pseudohylesinus Swaine, and it can be easily distinguished from it by the unicolored vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
. It also resembles the genus Dendroctonus Erichson, which differs in having a 7-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
.

Description

Species in this genus range from 2.0 to 5.7 mm in length. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is longer than wide. The declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
is convex and unarmedunarmed:
having no granules, teeth, tubercles, spines, or other protective structures
; sexual dimorphismdimorphism:
a genetically controlled condition in which individuals of a species are characterized by distinct patterns of color, size, or shape
is presented in this genus by the second declivital interstriaeinterstriae:
longitudinally arranged lines, often flat or raised, often having setae, and located between the striae on the elytron
of females which are more clearly impressed than in males. The vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
consists of hair-like setaehair-like setae:
setae that are thin and similar to a hair
. The fronsfrons:
the upper anterior portion of the head capsule
is transversely impressed. The anterior margin of the compound eye is entire. The scapescape:
the first and basal segment of the insect's antennae
is longer than the 6-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
. 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 ovateovate:
egg shaped, with the narrow end apically
with 3 straight suturessutures:
a seam or seam-like line of contact between two sclerites or hardened body parts immovably connected
. 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

Europe, Africa, and Asia

World fauna

Number of species: 3, Native species: 0, Introduced species: 1

Established exotic species

Hylurgus ligniperda is present in New York and California.

Hosts

Pinus