Sessilia

Sessilia is an unranked clade of barnacles, comprising the barnacles without stalks, or acorn barnacles. They form a monophyletic group and are probably derived from stalked or goose barnacles.^[3] Sessilia is divided into two orders. The Verrucomorpha contain two families, Verrucidae and Neoverrucidae, and the remaining 14 families are in the order Balanomorpha.^[4][2][5]

Sessilia
Semibalanus balanoides
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Thecostraca
Subclass:	Cirripedia
Superorder:	Thoracicalcarea
(unranked):	Sessilia Lamarck, 1818[1]
Orders[2]
Balanomorpha Verrucomorpha