In their planidial form, many species do not feed; they first molt into a form suited to eating rather than seeking out food. The second instar is completely different in appearance and behavior, often becoming grub- or maggot-like in the instars before pupation. As a rule, the instars after the first ecdysis are of more or less constant form and not highly mobile, being specialised for feeding and growth until the final larval instar metamorphoses into the pupal form.
In their planidial form, many species do not feed; they f,irst molt into a form suited to eating rather than seeking out food The second instar is completely different in appearance and behavior often becoming grub- or maggot-like in the instars before pupation. As a rule the instars after .the first ecdysis are of more or less constant form and not highly mobi,le, being specialised for feeding and growth until the final larval instar metamorphoses into the pupal form.