(Coleoptera: Chrysomelidae: Alticinae)
Chaetocnema Stephens
Chaetocnema aridula |
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Chaetocnema aridula |
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Distribution: Widely distributed throughout the world.
Statistics: More than 70 species in Palearctic, more
than 300 species worldwide.
Host Plants: Agropyrum,
Atriplex, Arrhenatherum, Beta, Calamagrostis, Carex,
Chenopodium, Eleocharis, Juncus, Polygonum, Rumex,
Salix (Medvedev & Roginskaya 1988).
Comments: The name Tlanoma is considered here as
a synonym of Chaetocnema based on the fact that these
subgenera have the same type species (C. concinna). For
the former members of Chaetocnema s. str. we propose using
the name Udorpes properly established by Motschulsky
(1845) (Konstantinov & Vandenberg, manuscript). White (1996)
erroneously attributed designation of the type species of
Plectroscelis to Monros & Bechyne (1956). The type species
was designated in 1845 by Chevrolat.
Diagnosis:
Body small to medium sized, elongate-ovate, convex to flat
from lateral view. Color yellow, brown, dark brown or
black, with or without metallic lustre; sometimes elytron and
pronotum differently colored.
Head small, hypo-prognathous, broadly oval, convex
from lateral view. Frontal ridge usually short, wide and flat
(subgenus Chaetocnema s. str.) or narrow more or less
acute (subgenus Tlanoma Motschulsky). Antennal calli
absent. Orbital line and frontal suture present. Eye small.
Clypeus and labrum short. Interantennal space wider or equal to
diameter of antennal socket. Antenna 11-segmented, filiform.
Pronotum usually convex, narrowly explanate
laterally, without furrow and impressions. Procoxal cavity closed
behind. Intercoxal prosternal process narrow, broadly explanate
posteriorly. Mesosternum wide.
Elytra oval, convex, with or without humeral calli.
Punctation arranged in striae. Striae regular in Tlanoma;
irregular in Chaetocnema s. str., especially on disk .
Epipleuron sub
horizontal, almost reaching posterolateral elytral margin.
Metafemur swollen. Meso- and metatibiae with obtuse
tooth beyond middle, followed by excavation having marginal row
of stiff bristles. Metatibial spine inserted medially. First
metatarsal segment almost as long as following three combined.
