Crypturgus

Type species

Bostrichus pusillus Gyllenhal

Adapted from Wood 1982, p. 740-743

Diagnosis

Crypturgus can be distinguished from Dolurgus Eichhoff by their smaller size, the 2-segmented antennal funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
which often appears as being only one, the clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
with a partial septumseptum:
a wall, partition, or internal projection within a cavity or hollow organ
in place of the first suture, and an indistinct suture near the apex.

Description

Species in this genus range from 1.0 to 1.2 mm in length and are approximately 2.8 times as long as wide. Their color varies from dark brown to black. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is longer than wide. The scutellumscutellum:
a shield-like bony plate or scale, as on the thorax of some insects
is small. The declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
is convex and has a vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
of recumbentrecumbent:
applied to setae which lay in the surface of the body
long bristles, the same as in the rest of the body; the females of two native species have a spongy area at the apex. The anterior margin of the compound eye is emarginateemarginate:
notched or indented
. The scapescape:
the first and basal segment of the insect's antennae
is longer than the 2-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
, which often looks like a single segment. 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 asymmetricalasymmetrical:
not identical on both sides of a central line
and club-shaped (rhomboid) with only an indistinct procurvedprocurved:
pertaining to structure (antennae, setae) which is basally perpendicular to the body and whose apical part is curved anteriorly
suture at its apex. 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

Canada and the United States, Europe, northern Asia, and North Africa

World fauna

Number of species: 17, Native species: 3, Introduced species: 1

Established exotic species

Crypturgus pusillus is present in Maine, New Hampshire, Massachusetts, Connecticut, Rhode Island, New York, New Jersey, and Pennsylvania.

Hosts

Abies, Cedrus, Larix, Picea, Pinus