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Barnacle adults are sessile; most are suspension feeders with hard calcareous shells, but the Rhizocephala are specialized parasites of other crustaceans, with reduced bodies. Barnacles have existed since at least the mid-Carboniferous, some 325 million years ago. In folklore, barnacle geese were once held to emerge fully formed from goose ...
Megabalanus stultus is one of three species of barnacle that live on fire corals (the genus Millepora). Savignium milleporae lives in the Indo-Pacific and lives on 9 species of Millepora ; Megabalanus ajax lives in the western Pacific and lives on Millepora platyphylla ; Me. stultus lives in the western Atlantic, and lives on Mi. alcicornis and ...
Cryptophialus minutus is a small (2 mm) cirripede that has no shell. It mechanically burrows into the shell of host organisms such as Concholepas peruviana. [2] Unlike many barnacle species, C. minutus is not hermaphroditic.
Like other acorn barnacles, S. cariosus is a filter feeder; when it is under water, the moveable terga at the apex part, and the cirri are extended to feed. When above water, the terga shut tightly for protection and to prevent desiccation. Small barnacles are sometimes "bulldozed" off the rock by the limpet Lottia digitalis while it is grazing ...
Megabalanus coccopoma, the titan acorn barnacle, is a tropical species of barnacle first described by Charles Darwin in 1854. Its native range is the Pacific coasts ...
Megabalanus californicus is a large acorn barnacle with a diameter of up to 30 mm (1.2 in). The steep-sided shell is formed of six plates finely striped vertically with reddish-purple and white. There are relatively wide, reddish radii between the plates where they fuse.
Thoracica is an infraclass 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. [2]
Rhizocephala are derived barnacles that are parasitic castrators. Their hosts are mostly decapod crustaceans, but include Peracarida, mantis shrimps and thoracican barnacles. Their habitats range from the deep ocean to freshwater. [1] [2] Together with their sister groups Thoracica and Acrothoracica, they make up the subclass Cirripedia. [3]