Seanet High Intertidal

Home
High Intertidal Mid Intertidal Low Intertidal    Rocky Shore Taxonomic Subtidal Taxonomic    Rocky Shore by Pictures Subtidal by Pictures

Balanus glandula Darwin, 1854
Phylum Arthropoda, Subph. Crustacea, Class Thecostraca, Subcl. Cirripedia, Order Thoracica, Family Balanidae

Acorn barnacle; white to gray, to 22 mm diameter; 6 unequal-size shell plates, ribbed to smooth depending on location; with calcareous basal plate.

Very abundant, high to mid-intertidal zones, exposed outer coast to protected bays.

Geo Range:  Aleutian Islands to northern Baja
Synonyms:
Similar species: 
Chthamalus is smaller & junction of its opercular plates appears more regular; Semibalanus cariosus is larger, has a thatched appearance & usually occurs lower on shore.

Image:
smaller brownish-gray barnacles (left of center & lower left) are Chthamalus.

SEANET DESKTOP