Nudibranch (Phyllidia varicosa) - Kenting (24-25Jul10) C 214.jpg
Kenting, Taiwan -- Close-up of the tubercles of Phyllidia varicosa.
Members of the Phyllidiidae family have relatively tough body tissue. The primary gills are absent and secondary respiratory structures are located underneath the mantle structure.
Many species have a characteristic odor derived from sesquiterpene isocyanides, which the nudibranch obtains from their prey and stores in its mantle for defense. These phyllidiid chemicals are extremely toxic.
Phyllidia varicosa is rather large (up to 115 mm) and considered the most common and widespread species of Phyllidia.