Trypophloeus

Type species

Bostrichus binodulus Ratzeburg

Adapted from Wood 1982, p. 850-854

Diagnosis

Trypophloeus is distinguished from other Cryphalina by the 5-segmented antennal funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
, the ovateovate:
egg shaped, with the narrow end apically
and often pointed clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
which has three straight suturessutures:
a seam or seam-like line of contact between two sclerites or hardened body parts immovably connected
, and by the absence of erect thick long bristles that occur in some of the other genera in the subtribe.

Description

Species on this genus range from 1.5 to 2.1 mm in length and are approximately 2.3 to 2.5 times as long as wide. Their color ranges from dark brown to black. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is usually wider than long, with the anterior half asperateasperate:
of a surface or texture which is rough
, and the anterior margin armedarmed:
having a sclerotized surface structure, giving a rough texture; may serve as defense
; their lateral margins are not marked by a raised line. The scutellumscutellum:
a shield-like bony plate or scale, as on the thorax of some insects
is small and flush with the elytraelytra:
the two external and hardened or sclerotized forewings of adult Coleoptera, often appearing leather-like in texture
. 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
. The vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
consists of abundant, short ground cover of scales and/ or hair and interstrial rows of short erect bristles. The anterior margin of the compound eye is entire. The scapescape:
the first and basal segment of the insect's antennae
is usually as long as 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 ovateovate:
egg shaped, with the narrow end apically
, apically pointed, and has three 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

Northern areas of North America, Europe, and Asia

World fauna

Number of species: 15, Native species: 4, Introduced species: 0

Hosts

Alnus, Salix, Populus