Agriculture Reference
In-Depth Information
Fig. 66 Antenna of a clavicornid beetle - family
Nitidulidae.
Fig. 67 Pronotum of a flat bark beetle - family
Cucujidae.
in northern Europe found only in imported
grain.
EXAMPLE: Rhyzopertha dominica (larva =
lesser grain borer).
the last one to two abdominal tergites exposed;
usually five (rarely four) tarsal segments on each
leg (i.e. tarsal formula 5-5-5; rarely 4-4-4).
Larvae usually cylindrical, with well-developed
thoracic legs.
EXAMPLE: Meligethes spp. (pollen beetles).
Superfamily CLEROIDEA
11. Family TROGOSSITIDAE
A mainly tropical family of often predatory
beetles; antennae clubbed; tarsi 5-segmented,
the basal segment small, the apical segment
relatively long and bearing a small lobe, visible
ventrally between the claws. The European
fauna includes a minor pest of stored food prod-
ucts, which is also partly predacious on other
pests.
EXAMPLE: Tenebroides mauritanicus (cadelle
beetle).
13. Family CUCUJIDAE (flat bark beetles)
Small, flattened beetles with the lateral margins
of the thorax often dentate (Fig. 67); antennae
indistinctly clubbed and often filiform. Often
predatory but some species associated with
stored farm products.
EXAMPLE: Cryptolestes spp. (grain beetles).
Superfamily
CUCUJOIDEA
14. Family SILVANIDAE
(flat grain beetles)
A varied grouping, often subdivided into the
Clavicornia (antennae distinctly clubbed. Fig. 66;
tarsal formula 3 of female never 5-5-4) and the
Heteromera (antennae weakly clubbed; tarsal
formula of female 5-5-4); abdomen with five vis-
ible sternites. The following families (except the
Tenebrionidae) all belong to the Clavicornia.
Essentially similar to members of the family
Cucujidae but antennae clubbed and the third
tarsal segment lobed beneath.
EXAMPLES: Ahasverus advena (foreign grain
beetle);
Oryzaephilus surinamensis
(saw-
toothed grain beetle).
12. Family NITIDULIDAE (p. 134 et seq.)
15. Family CRYPTOPHAGIDAE
(mould beetles) (p. 135 et seq.)
A large and varied family of mainly small bee-
tles; elytra typically shorter than abdomen, with
A rather indistinct family of small beetles
with distinctly clubbed antennae; elytra rela-
tively hairy; tarsal formula of males normally
5-5-4. Many species are fungal feeders, several
are associated with damp stored food pro-
5 The number of tarsal segments on the foreleg, mid-
leg and hindleg, respectively. Beetles with an unequal
number of tarsal segments on the three pairs of legs
are often described as 'heteromerous'.
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