Chaetophloeus

Type species

Chaetophloeus hystrix LeConte

Adapted from Wood 1982, p. 348-363

Diagnosis

Chaetophloeus are similar to Liparthrum Wollaston but are distinct in having a 5-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
and also by the elevated crenulationscrenulations:
structures on the surface of the integument an having irregular, wavy, or serrate outline
on the anterior margin of the elytraelytra:
the two external and hardened or sclerotized forewings of adult Coleoptera, often appearing leather-like in texture
, which are higher near the suturalsutural:
pertaining to a suture such as the elytral suture or midline between the two wings
area, and by the groups of asperitiesasperities:
pertaining to surface roughenings or dot-like elevations that are not pointed
in the anterolateral area of the pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
.

Description

Species in this genus range from 1.1 to 2.5 mm in length and are approximately 1.4 to 2.1 times as long as wide. Their color ranges from brown to black. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is wider than long and armedarmed:
having a sclerotized surface structure, giving a rough texture; may serve as defense
by two or three paired clusters of asperitiesasperities:
pertaining to surface roughenings or dot-like elevations that are not pointed
in the anterolateral area of the discdisc:
the central upper surface of any anatomical structure or body part
. The scutellumscutellum:
a shield-like bony plate or scale, as on the thorax of some insects
is not visible. The elytral bases are armedarmed:
having a sclerotized surface structure, giving a rough texture; may serve as defense
from the suture to striaestriae:
longitudinally arranged lines often impressed or marked by punctures that are located between the interstriae on the Coleopteran elytron
4 by elevated crenulationscrenulations:
structures on the surface of the integument an having irregular, wavy, or serrate outline
. The declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
is usually convex with one North American species having it sulcatesulcate:
having narrow, deep furrows or grooves
(concave); unarmedunarmed:
having no granules, teeth, tubercles, spines, or other protective structures
except in C. hystrix which has tuberclestubercles:
stiff, pointed, tapered processes on the surface of the integument, usually shorter than a spine
. The vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
consists of scale-like setaescale-like setae:
setae that are wider than hair
, often in patterns of dark and light colors, but not as contrasting as in Hylesinus Fabricius or Pseudohylesinus Hopkins. The fronsfrons:
the upper anterior portion of the head capsule
is sexually dimorphicdimorphic:
a structure that occurs in two different forms, such as color, shape, or size
, with a conspicuous epistomalepistomal:
pertaining to the epistoma
brush. The anterior margin of the compound eye is sinuatesinuate:
descriptive of a narrow and winding thin structure or margin of a feature
to emarginateemarginate:
notched or indented
. The scapescape:
the first and basal segment of the insect's antennae
is shorter than the 5-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 oval and is usually marked by three straight-transverse suturessutures:
a seam or seam-like line of contact between two sclerites or hardened body parts immovably connected
, rarely slightly procurvedprocurved:
pertaining to structure (antennae, setae) which is basally perpendicular to the body and whose apical part is curved anteriorly
. 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 to Brazil

World fauna

Number of species: 24, Native species: 9, Introduced species: 0

Hosts

Acras, Amelanchier, Cercidium, Cercocarpus, Cowania, Encelia, Eysenhardtia, Peraphyllum, Phoradendron, Prunus, Pyrus, Ribes, Rhus, Struthanthus