SCRATCHnDENT Semibalanus Balanoides - Acorn Barnacle Cluster #91201
RocknReefs Inc.

SCRATCHnDENT Semibalanus Balanoides - Acorn Barnacle Cluster #91201

Sale price $ 2.50 Regular price $ 10.33



By placing your order for these items, you acknowledge the below conditions. 

These corals have flaws that may include but are not limited to the below conditions. All Corals are aquarium safe and have been used in commercial and retail quarantine systems to brighten up displays and add habitat. These corals are subject to excessive flashing, air bubbles, pulled or rolled edges/tips, short pours and/or color variances. Some corals my float and will require a weighted base. Some corals may arrive drilled with a mounting peg installed. Some may be drilled with no peg installed and just the hole. We will provide mounting pegs and mounting instructions if requested. 

4 x 3 x 1

Semibalanus balanoides 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.

Adult S. balanoides grow up to 15 millimetres (0.6 in) in diameter, and are sessile, living attached to rocks and other solid substrates. They have six grayish wall plates surrounding a diamond-shaped operculum. The base of the shell is membranous in Semibalanus, unlike other barnacles which have calcified bases. When the tide rises to cover the barnacles, the operculum opens, and feathery cirri (modified thoracic appendages)are extended into the water to filter food from the seawater. When the tide falls, the operculum closes again to prevent desiccation; the reduction from the primitive condition of eight wall plates to six is believed to decrease water loss even further by reducing the number of sutures through which water can escape. 


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