goose barnacle
A stalked barnacle of the genus Lepas, often found attached to driftwood or floating objects. The name comes from its resemblance to an eboshi (traditional Japanese hat).
Many goose barnacles were attached to the driftwood that washed ashore.
Goose barnacles can attach to ship bottoms and slow the vessel down.
フジツボ (acorn barnacle) is a sessile barnacle that attaches directly to rocks, while 烏帽子貝 is a stalked barnacle often found on floating objects.
Standard kanji spelling for this marine organism.
Katakana spelling is common in biological contexts.
From 烏帽子 (eboshi, a traditional black-lacquered hat) + 貝 (kai, shellfish), referring to the shape of the barnacle's shell.