Corthylus

Type species

Bostrichus compressicornis Fabricius

Adapted from Wood 1982, p. 1270-1310

Diagnosis

Species in the genus Corthylus can be distinguished from other members of the subtribe Corthylina by the single segmented antennal funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
, the clubbed-shaped and asymmetricalasymmetrical:
not identical on both sides of a central line
club, and also by the subtriangularsubtriangular:
nearly or almost triangular in shape
scapescape:
the first and basal segment of the insect's antennae
.

Description

Species in this genus range from 1.2 to 4.3 mm in length and are approximately 2.0 to 2.5 times as long as wide. Their color ranges from yellowish brown to black, and several species out of the region are bicolored. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
appears as long as wide, although it is actually either slightly wider or longer; its anterior margin usually has serrationsserrations:
a series or set of saw-like teeth or notches
in females, or one pair of median serrationsserrations:
a series or set of saw-like teeth or notches
in males. The scutellumscutellum:
a shield-like bony plate or scale, as on the thorax of some insects
is large and flush with the elytraelytra:
the two external and hardened or sclerotized forewings of adult Coleoptera, often appearing leather-like in texture
surface. The declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
varies from convex to concave. 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
, usually on the declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
. The metepisternummetepisternum:
the sclerite between the first and second lateral thoracic sutures
is only visible anteriorly. In females, the fronsfrons:
the upper anterior portion of the head capsule
can be elaborately ornamentedornamented:
having markings or structures on the esclerotized regions of the integument, such as setae, tubercles, or granules
by a long tuft of hair not present in species north of Mexico. 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 single segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
. The clubbed to oval-shaped clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
is sexually dimorphicdimorphic:
a structure that occurs in two different forms, such as color, shape, or size
but in both sexes is large and asymmetricalasymmetrical:
not identical on both sides of a central line
with one to three procurvedprocurved:
pertaining to structure (antennae, setae) which is basally perpendicular to the body and whose apical part is curved anteriorly
sutures usually present, the first usually septateseptate:
having a septum or septa
. In some females, there is thin stalk of long setaesetae:
a hollow, often slender and hair-like cuticular projection
called the cirrus on the lateral margin of the 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
of the clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
(only present in C. spinifer in North America north of Mexico). 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 Argentina

World fauna

Number of species: 117 Native species: 4, Introduced species: 0

Hosts

Acer, Alnus, Castanea, Cecropia, Clusia, Conostegia, Ficus, Liriodendron, Miconia, Myrica, Ochroma, Persea, Phoebe, Platanus, Quercus, Salix, Solanum, Spondias, Theobroma, Ulmus