23. How are the main classes
of arthropods classified
according to the presence of
larval stage in their embryonic
development?

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In crustaceans there species with
direct others with indirect
. In insects there
species without larval (ametabolic
insects),others undergoing
development beginning with egg
stage followed a nymph stage
( insects) and others
indirect development beginning the
larval stage ( insects).
The transformation a larva into
adult individual is metamorphosis.
Hemimetabolic insects
incomplete metamorphosis while
insects undergo complete
.