File: <conio1.ima.htm> [For educational purposes only] Terminology Glossary <Principal Natural
Enemy Groups > <Citations> |
Immature Stages
of Coniopterygidae
Both adults and immatures feed on
small, relatively inactive prey such as coccids, mites and aphids. They are mainly found on shrubs and trees,
although some species seem to be confined to low vegetation. Eggs are laid singly on infested
foliage. They are oval in outline,
flattened dorsoventrally, and slightly pointed at the micropylar end. The chorion surface bears reticulate
markings. Eggs of C. hageni Banks are yellowish-pink, although some may have an
orange tint (Quayle 1913). Conwentzia psociformis lays a total of ca. 200 eggs. The number of larval instars was
noted as 4 for C. hageni (Quayle 1913). Larvae of this species feed on all stages
of red mites, the body contents being entirely sucked out from a single
puncture. One larva consumed 226 red
mites during its feeding period. The
oval, flattened cocoons of Conwentzia
are usually found on the underside of leaves or on bark. They consist of a double layer of silk
with loosely woven margins. Cocoons
of Semidalis aleyrodiformis Steph. do not
have a clear double layer of silk.
Withycombe (1923, 1924a) found that the pupal skin is often left
within the cocoon rather than discarded after adult emergence. The life cycle of C. hageni is 37-43 days in summer, of which the egg, larval
and cocoon stages cover 6-8, 18-22 and 13 days, respectively. Semidalis
aleyrodiformis overwinters
as mature larvae within the cocoon, while a portion of the adults of the
first brood of C. psociformis persist in
sheltered spots until the following springtime (Clausen 1940/62).
References: Please
refer to <biology.ref.htm>,
[Additional references may be
found at: MELVYL Library ] |