Acorn barnacle

PHYLUM ARTHROPOD SUBPHYLUM CRUSTACEA acorn barnacles

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An Acorn barnacle Semibalanus balanoides

Photo posted on 2014-07-08. Shot taken with NIKON D5000.

Northern Acorn Barnacle (Balanus cariosus)

Megabalanus coccopoma Titan Acorn Barnacle

Titan acorn barnacles (Megabalanus coccopoma).

acorn barnacles

Alyson • romantheocean on Instagram: "The first time I found a “Titan Acorn Barnacle,” my jaw dropped. 😱 It was HUGE compared to all the tiny ones I have found on various beaches over the years. I collected these along Amelia Island this past winter after a storm. 🚨 Nerd Alert: They are considered an aggressive species and ecological threat due to their expansive settlement, rapid growth, and large size as they are able to out compete native barnacles for habitat and food sources. Their…

Object Type: Manuscript Title: Monograph on the Sub-Class Cirripedia, 1851–54, vol.1 Maker: Charles Darwin Date: 1851-54 Medium: Color plate in printed book, Plate No.1 Dimensions: 9 x 6 x 2 1/4; x 12 in. open; Plate 8 3/4 x 5 1/2 in. Significance: zoology

Acorn Barnacles

Although it may not look like it, the acorn barnacle is a type of crustacean related to shrimp, crabs, and lobsters. Learn more.

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The common "acorn" barnacle are found on nearly all humpback whales. Worldwide distribution. The barnacles settle on the edge of the pectoral flippers, the flukes and the chin and genital areas. The accepted scientific wisdom at the moment is that these barnacles have a one year life cycle, attaching themselves to the whale on the warm water wintering grounds, growing in the cold feeding grounds, then falling off when the whales return to the warm wintering grounds. These examples are fairly…

acorn barnacle

Acorn Barnacles

Acorn Barnacle · University of Puget Sound

Semibalanus balanoides

Description based on Mohr et al. (2004): thallus immersed; perithecia 0.10–0.24 mm. diameter, black, flattened to moderately convex, immersed in pits in shells and softer rocks. Common on rocky shores, on chalk, limestone or on shells of molluscs and barnacles, evidently contributing to weakening and erosion of shells as indicated in the photograph below.