What is "cerata"

n. (plural of ceras English)

''The tortrix moth genus Cerata is considered a junior synonym of '' Cydia.

Ceras, plural Cerata, are anatomical structures found externally in nudibranch sea slugs, especially in aeolid nudibranchs, marine opisthobranch gastropod mollusks in the clade Aeolidida. The singular of cerata is ceras, which comes from the Greek word "κέρας", meaning "horn", a reference to the shape of these structures.

Cerata are dorsal and lateral outgrowths on the upper surfaces of the body of these nudibranchs.