Acorn barnacle

Acorn Barnacle Semibalanus balanoides
Like all adult barnacles, the adult acorn barnacle remains fixed in one place once it has anchored itself to a site.

Acorn barnacles, related to shrimp, hide their identity in snail-like shells. But they begin life as free swimming larvae.

Acorn barnacle (Semibalanus balanoides)
Barnacles are well-known intertidal organisms. They were not firmly accepted to be crustaceans until the 1830s; before this time, the... More 7 Images 0 videos ...

Balanus is an acorn barnacle commonly found on rocks; it has a thick conical shell attached at its wide base, with an opening at the top.

Balanus glandula (Acorn Barnacle)
Description: White to grey. Cone-shaped.
Range: Aleutian Islands, Alaska to southern California.
Habitat: On rocks and shelled animals. High to mid intertidal.

Acorn Barnacle
Acorn Barnacle
Acorn Urn
Acquisition and movement of volcanic glass in the Primorye Region of Far Eastern Russia
Acute and recurrent skin ulceration after spider bite ...

The vernacular name barnacle, traceable to the fable of pedunculate cirripedes hatching out into bernicle geese, has also been transferred to the sessile cirripedes, which are popularly known as acorn barnacles.

B. bairdii have natural parasites such as ship barnacles, acorn barnacles, and whale lice. Oval sucker scars caused by parasite crustaceans (Livoneca ravnaudi) can be seen on many individuals. They are sometimes found stranded (Watson, L. 1981).

See also: Shell, Lobster, Shrimp, Crustacean, Diver