Key to Infraclass Cirripedia, Superorder Thoracica (Barnacles)

Phylum Arthropoda
 Subphylum Crustacea
  Class Maxillopoda

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

Taxonomic Levels Represented in This Key:
Infraclass Ascothoracida
Superorder Acrothoracica
Superorder Rhizocephala
Superorder Thoracica
 Order Pedunculata
  Suborder Lepadomorpha
 Order Sessilia
  Suborder Balanomorpha
Order Rhizocephala
 Suborder Kentrogonida
  Family Sacculinidae

Page created by Melissa McFadden, 7-2002
Edited by Hans Helmstetler 10-2002, Dave Cowles 2005, 2008