SEM of two feeding stages of Symbion pandora on a Nephrops norvegicus seta; individual on left is in feeding position

Scanning electron microscopy of two feeding stages of Symbion pandora on a seta form a Norwegian Lobster (Nephrops norvegicus). The individual on the right has a closed mouth ring; the one on the left has the mouth ring everted in the typical feeding position with the cilia exposed.