Fig. 2

Rami from adult barnacle A. amphitrite highlighting the setae in pre- and post-molt stages. a-b) Images of several setae from barnacles collected in pre-molt (proecdysis) stage. Black arrows indicate the presence of new setae development prior to molting, and white arrows indicate invaginations of the newly developing setae. c-d) Images of setae from barnacles collected in post-molt stages as indicated by the absence of new setae or invaginations and an expanded setal matrix