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Acorn barnacle and acorn shell are vernacular names for certain types of stalkless barnacles, generally excluding stalked or gooseneck barnacles. As adults they are typically cone-shaped, symmetrical, and attached to rocks or other fixed objects in the ocean.
Semibalanus balanoides (common barnacle, common rock barnacle, or northern rock barnacle) is a common and widespread boreo-arctic species of acorn barnacle. It is common on rocks and other substrates in the intertidal zone of north-western Europe and both coasts of North America .
Calanticidae is a family of acorn barnacles in the order Calanticomorpha. There are about 12 genera and more than 60 described species in Calanticidae. There are about 12 genera and more than 60 described species in Calanticidae.
This acorn barnacle is a moderate-sized one with a diameter of up to 22 mm (0.9 in). [1] The shell is formed by overlapping plates and has a calcareous basis. It has more the shape of a cylinder than the shape of a cone. The white operculum has heavily ridged walls. [1] It can live up to ten years. [1]
Most barnacles are encrusters, attaching themselves to a hard substrate such as a rock, the shell of a mollusc, or a ship; or to an animal such as a whale (whale barnacles). The most common form, acorn barnacles, are sessile, growing their shells directly onto the substrate, whereas goose barnacles attach themselves by means of a stalk. [8]
Semibalanus balanoides (Linnaeus, 1767) (northern acorn barnacle) Semibalanus cariosus (Pallas, 1788) (thatched barnacle) Semibalanus madrasensis (Daniel, 1958)
A. amphitrite and Balanus eburneus (ivory acorn barnacles), Cayo Costa State Park, Florida. Amphibalanus amphitrite is a species of acorn barnacle in the Balanidae family. Its common names include the striped barnacle, the purple acorn barnacle and Amphitrite's rock barnacle. It is found in warm and temperate waters worldwide.
Balanidae Leach, 1817 (acorn barnacles) Bathylasmatidae Newman & Ross, 1971; Catophragmidae Utinomi, 1968; Chelonibiidae Pilsbry, 1916 (turtle barnacles) Chionelasmatidae Buckeridge, 1983; Chthamalidae Darwin, 1854 (star barnacles) Coronulidae Leach, 1817 (whale barnacles) Elminiidae Foster, 1982 [4] Pachylasmatidae Utinomi, 1968; Pyrgomatidae ...