Entomologist's Monthly Magazine
The Meloidae and Rhipiphoridae are related families of parasitic beetles and exhibit larval heteromorphosis, in which successive larval instars are adapted for different modes of life and differ greatly in form. The first instar, known as a triungulin, is a planidium, which is active and free-living and often reaches its feeding site by phoresy on the adult of the host insect. After the food source is found active life ceases and the subsequent instars become stout and grub-like.
Callan, E. McC., "Notes on Meloidae and Rhipiphoridae (Col.) from Trinidad" (1977). Bu. Paper 84.
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