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Ding ding! Vincent got it! As carapids mature they lose the head filament (known as a vexillum) and long tail filament. Many species live out their adulthood in the anuses of echinoderms. Many even parasitize their hosts' gonads!
Let's try another one. You will probably be familiar with the adult version of this:
View attachment 211146
If anyone is still listening, the last one was a yellow tang larva (Zebrasoma flavescens) somewhere around or after day 40. I am told that the pigment sash over its eye is a form of mimicry that looks like a smaller fish pointing up. Nature is weird.