Subterclass
Thoracica (Normal barnacles)
Balanus crenatus. Photo: (c) Lily M, some rights reserved (CC BY-NC)
Thoracica is a superorder of crustaceans which contains the most familiar species of barnacles found on rocky coasts, such as Semibalanus balanoides and Chthamalus stellatus. They have six well-developed limbs, and may be either stalked or sessile. The carapace is heavily calcified. The group includes free-living and commensal species.
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