After Parker, 1981 and Martin & Davis, 2001
<==o Cirripedia Burmeister, 1834
|--o Acrothoracica Gruvel, 1905
| |-- Trypetesidae Stebbing, 1910 [Apygophora Berndt, 1907]
| `--o Pygophora Berndt, 1907
| |-- Cryptophyalidae Gerstaecker, 1866
| `-- Lithoglyptidae Aurivillius, 1892
|--o Rhizocephala Müller, 1862 (juuripäiset)
| |--o Kentrogonida Delage, 1884
| | |-- Peltogastridae Lilljeborg, 1860 non Boschma
| | |-- Sacculinidae Lilljeborg, 1860 non Boschma (pussiäyriäiset)
| | `-- Lernaeodiscidae Boschma, 1928
| `--o Akentrogonida Häfele, 1911
| |?- Akentrogonidae Häfele, 1911 [not recognized by Martin & Davis, 2001]
| |-- Chthamalophilidae Bocquet-Védrine, 1961
| |-- Clistosaccidae Boschma, 1928 [incl. Sylonidae]
| |-- Duplorbidae Høeg & Rybakov, 1992
| |-- Mycetomorphidae Høeg & Rybakov, 1992
| |-- Polysaccidae Lützen & Takahashi, 1996
| `-- Thompsoniidae Høeg & Rybakov, 1992
`--o Thoracida Darwin, 1854 (varsinaiset siimajalkaiset)
|--o Pedunculata Lamarck, 1818 (hanhenkaulamaiset siimajalkaiset)
| |--o Heteralepadomorpha Newman, 1987
| | |-- Anelasmatidae Gruvel, 1905
| | |-- Heteralepadidae Nilsson-Cantell, 1921
| | |-- Koleolepadidae Hiro, 1933
| | |-- Malacolepadidae Hiro, 1937
| | |-- Microlepadidae Zevina, 1980
| | `-- Rhizolepatidae Zevina, 1980
| |--o Iblomorpha Newman, 1987
| | `-- Iblidae Leach, 1825
| |--o Lepadomorpha Pilsbry, 1916
| | |-- Lepadidae Darwin, 1852 (hanhenkaulat)
| | |-- Oxynaspididae Gruvel, 1905
| | `-- Poecilasmatidae Annandale, 1909
| `--o Scalpellomorpha Newman, 1987
| |-- Calanticidae Zevina, 1978
| |-- Lithotryidae Gruvel, 1905
| |-- Pollicipedidae Leach, 1817
| `-- Scalpellidae Pilsbry, 1907
`--o Sessilia Lamarck, 1818
|--o Brachylepadomorpha Withers, 1923
| `-- Neobrachylepadidae Newman & Yamaguchi, 1995
|--o Verrucomorpha Pilsbry, 1916
| |-- Neoverrucidae Newman, 1989
| `-- Verrucidae Darwin, 1854
`--o Balanomorpha Pilsbry, 1916 (merirokkomaiset siimajalkaiset)
|--o Chionelasmatoidae Buckeridge, 1983
| `-- Chionelasmatidae Buckeridge, 1983
|--o Pachylasmatoidea Utinomi, 1968
| `-- Pachylasmatidae Utinomi, 1968
|--o Chthamaloidea Darwin, 1854
| |-- Catophragmidae Utinomi, 1968
| `-- Chthamalidae Darwin, 1854
|--o Coronuloidea Leach, 1817
| |-- Chelonibiidae Pilsbry, 1916
| |-- Coronulidae Leach, 1817
| `-- Platylepadidae Newman & Ross, 1976
|--o Tetraclitoidea Gruvel, 1903
| |-- Bathylasmatidae Newman & Ross, 1976
| `-- Tetraclitidae Gruvel, 1903
`--o Balanoidea Leach, 1817 (merirokonsukuiset siimajalkaiset)
|-- Archaeobalanidae Newman & Ross, 1976
|-- Balanidae Leach, 1817 (merirokot)
`-- Pyrgomatidae Gray, 1825
Reference(s):
- Hou X. & Bergström, J., 1997: Arthropods of the Lower Cambrian Chengjiang fauna, southwest China.
–Fossils & Strata, Number 45, 22nd December 1997, pp. 1-116
- Lahti, S., Malmström, K. K., Koli, L., Leikola, A., Syrjämäki, J. & Lahti, J., 1980: Zoo, Suuri Eläinkirja 6: Selkärangattomat.
–Werner Söderström Osakeyhtiö, Porvoo-Helsinki-Juva, 1980.
Original work [in French]: Beaut, Du Monde Animal XI & XII Invertébrés.
–Rizzoli Editore, Milano, 1968.
- Martin, J. W. & Davis, G. E., 2001: An Updated Classification of the Recent Crustacea.
–Natural History Museum of Los Angeles County, Science Series: Vol. #39, pp. vii-124
- Parker, S. P. (ed.), 1982: Synopsis and classification of living organisms. Vols. 1 & 2
–McGrew-Hill Book Company