Trischidias

Type species

Trischidias georgiae Hopkins

Adapted from Wood 1982, p. 872-874

Diagnosis

Trischidias is distinguished from related genera by the character combination of an entire anterior margin of the compound eye, a three segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
, and a sub-circular clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
bearing three straight suturessutures:
a seam or seam-like line of contact between two sclerites or hardened body parts immovably connected
. The scale-like setaescale-like setae:
setae that are wider than hair
are peculiar as they widen toward the tip.

Description

Species in this genus range from 0.65 to 1.10 mm and are approximately 2.0 to 2.3 times as long as wide. Their color varies from brown to dark brown. The pronotumpronotum:
the upper or dorsal surface of the first thoracic segment
is wider than long with lateral margins raised in a fine line and asperateasperate:
of a surface or texture which is rough
anteriorly with the anterior margin armedarmed:
having a sclerotized surface structure, giving a rough texture; may serve as defense
by two to four teeth. The scutellumscutellum:
a shield-like bony plate or scale, as on the thorax of some insects
is small. The convex declivitydeclivity:
the apical portion of the beetle elytra that slopes downward
has a vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
consisting of strial rows of recumbentrecumbent:
applied to setae which lay in the surface of the body
hair-like setaehair-like setae:
setae that are thin and similar to a hair
and interstrial rows of scale-like setaescale-like setae:
setae that are wider than hair
which are wider at the tip; this vestiturevestiture:
a surface covering of scales or setae on the body, wing, or other appendage
is thinner and less abundant in the rest of the body. 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 3-segmented funiclefunicle:
the antennal segments located between the scape and the club in some Coleoptera
, which sometimes has a fourth and difficult-to-see suture fused to the clubclub:
the apical segment of the insect antennae that is enlarged or thickened such that it is anatomically differentiated from the preceding segments
. 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 near-circular with 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

Most of eastern USA and south to Texas, Mexico, Brazil and Africa

World fauna

Number of species: 8, Native species: 4, Introduced species: 0

Hosts

Acer, Asimina, Carya, Castanea, Quercus, Rhizophora, Rhododendron, Rhus, Robinia, Salix, Ulmus