| Class | CIRRIPEDIA (barnacles) |
| Subphylum | CRUSTACEA (crustaceans) |
| Phylum | ARTHROPODA (arthropods) |
| Superphylum | ECDYSOZOA (skin shedders) |
| Clade | Bilateria (bilaterally symmetrical animals) |
| Subkingdom | EUMETAZOA (metazoans) |
| Kingdom | ANIMALIA (animals) |
| Domain | Eukaryota (eukaryotes) |
| Life | BIOTA (living things) |
| Author | Year | Title | Source | |
|---|---|---|---|---|
 ( ) |
Conway, D.V.P. | 2012 | Marine Zooplankton of southern Britain. Part 2: Arachnida, Pycnogonida, Cladocera, Facetotecta, Cirripedia and Copepoda | Occasional Publications, No. 25, 163pp, Marine Biological Association |
| de Kluijver, M.J. & S.S. Ingalsuo, S.S. | Crustacea | wbd.etibioinformatics.nl/bis/crustacea.php |
CIRRIPEDIA (barnacles) may also be included in identification literature listed under the following higher taxa:
 NBN (data.nbn.org.uk)
has a distribution map for CIRRIPEDIA (barnacles)
|
 BioInfo (www.bioinfo.org.uk)
has 5 host/parasite/foodplant and/or other relationships for CIRRIPEDIA (barnacles)
|
The number of wall plates (4 or 6) is an important diagnostic feature for identifying acorn barnacle. Unfortunately in many species they fuse together, or merge with neighbours as the barnacle grows. These can be assumed to have 6 plates as in those with 4 (Elminius & Verruca) the plates generally remain disitnct.
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Photographs from other photographers are used with permission but not included under the above CC licence.