sessilida
Sessilida is a taxonomic group within the order Decapoda, specifically referring to crustaceans that are sessile in their adult stage. This means they are permanently attached to a substrate, unlike their motile larval forms or other decapod crustaceans that can move freely. The most well-known examples of sessilida are barnacles, which belong to the infraorder Cirripedia. These animals cement themselves to various surfaces, including rocks, ship hulls, whales, and even other marine invertebrates.
The sessilida lifestyle involves a significant metamorphosis from a free-swimming larval stage to a permanently attached