Key to Infraclass Cirripedia, Superorder Thoracica (Barnacles)

Adapted from  Kozloff, 1987, 1996  p. 314 (Copyright 1987, 1996, University of Washington Press.  Used in this web page by permission of University of Washington Press)

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Taxonomic levels as specified in Martin and Davis, 2001

Note:  The barnacles in the key below belong to the superorder Thoracica (acorn and goose barnacles), to which the large majority of local barnacle species belong. 
 

1a	Parasitic, not recognizable as a barnacle as an adult but has a cypris larva	Infraclass Ascothoracida, Superorders Rhizocephala and Acrothoracica
1b	Mostly freeliving and a few parasitic barnacles, but still recognizable as a barnacle	2
2a	Attached to the substratum by a somewhat flexible stalk	Suborders Lepadomorpha and Scapellomorpha
2b	Not attached by a stalk	Suborder Balanomorpha