After Chen et al., 1995, Lundberg, 1995-1997, Shu et al., 1996 and Shu et al., 1999

<==o Cephalochordata Owen, 1846 [Leptocardia; Acrania] (lancelets; kallottomat selkäjänteiset)
   |?- †Metaspriggina sp. Simonetta & Insom, 1993
   |-- †Cathaymyrus diadexus Shu, Conway Morris & Zhang, 1996
   |-- †Pikaia gracilens Walcott, 1911 [= Pikeia gracilens lapsus calami]
   `--o Acrania (suikulaiset)
      |?- †Paleobranchiostoma hamatotergum Oelofsen & Loock, 1981
      `--o Amphioxiformes (suikulaiset)
         |--o Branchiostomidae Bonaparte, 1841 [incl.? Assymmetronidae]
         |  `--o Branchiostoma Costa, 1834 [Brachiostomus; Amphioxus Yarrell, 1836; Dolichorhynchus] [ITIS report: 21sp + 2ssp]
         |     |?- B. asymmetron [?]
         |     |-- B. africae Hubbs, in Monod, 1927
         |     |-- B. arabiae Webb, 1957
         |     |--o B. belcheri (Gray, 1847) [Amphioxus belcheri Gray, 1847]
         |     |  |-- B. b. belcheri (Willey, 1897) [Amphioxus belcheri japonica Willey, 1897]
         |     |  `-- B. b. tsingtauense Tchang-Si & Kwang-Chung Koo, 1936
         |     |-- B. bennetti Boschung & Gunther, 1966
         |     |-- B. bermudae Hubbs, 1922
         |     |-- B. californiense Andrews, 1893 [B. californiensis Andrews, 1893] (Californian lancelet)
         |     |-- B. capense Gilchrist, 1902
         |     |-- B. caribaeum Sundevall, 1853 (Caribbean lancelet)
         |     |-- B. elongatum (Sundevall, 1852) [Amphioxus elongatus Sundevall, 1852]
         |     |-- B. floridae Hubbs, 1922 [non B. floridae Boschung & Mallory, 1956] (Florida lancelet)
         |     |-- B. gambiense Webb, 1958
         |     |-- B. indicum (Willey, 1901) [Dolichorhynchus indicum Willey, 1901]
         |     |-- B. lanceolatum (Pallas, 1774) [Limax lanceolatus Pallas, 1774; Amphioxus lanceolatus (Pallas, 1774); Branchiostoma lubricum Costa, 1834; non B. lanceolatum Fitzinger, 1862] (suikulainen; common lancelet)
         |     |-- B. leonense Webb, 1956
         |     |-- B. longirostrum Boschung, 1983
         |     |-- B. malayanum Webb, 1956
         |     |?- B. moretonensis Kelly, 1966
         |     |-- B. nigeriense Webb, 1955
         |     |-- B. platae Hubbs, 1922
         |     |-- B. senegalense Webb, 1955
         |     |-- B. tattersalli Hubbs, 1922
         |     `-- B. virginiae Hubbs, 1922
         `--o Asymmetrontidae [Epigonichthyidae, synonym of Branchiostomidae Bonaparte, 1841?] (toispuolissuikulaiset)
            `--o Epigonichthys Peters, 1876 [Asymmetron Andrews, 1893; Heteropleuron Kirkaldy, 1894; Amphioxides Gill, 1895] (toispuolissuikulaiset) [ITIS report: 7sp]
               |-- E. australis (Raff, 1912) [Asymmetron australis Raff, 1912]
               |-- E. bassanus (Günther, 1884) [Branchiostoma bassanum Günther, 1884; non E. bassanum]
               |-- E. cingalensis (Kirkaldy, 1894) [Heteropleuron cingalense Kirkaldy, 1894]
               |-- E. cultellus Peters, 1877 [Branchiostoma cultellus (Peters, 1877)]
               |-- E. hectori (Benham, 1901) [Heteropleuron hectori Benham, 1901]
               |-- E. lucayanus (Andrews, 1893) [Asymmetron lucayanum Andrews, 1893, non E. lucayanum]
               `-- E. maldivensis (Foster Cooper, 1903) [Asymmetron maldiviense Foster Cooper, 1903, non E. Maldiuense; Amphioxides valdiviae Goldschmidt, 1905; Branchiostoma valdiviae (Goldschmidt, 1905); Heteropleuron agassizii Parker, 1904]

Reference(s):

Special thanks to:

Jos H. M. Dols, for gathering additional information and species of these animals.

Web-links of cephalochordates:

http://www.google.com

http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=159679

http://www.ucmp.berkeley.edu/chordata/cephalo.html

http://www.ncbi.nlm.nih.gov/htbin-post/Taxonomy/wgetorg?mode=Undef&id=7737&lvl=3&keep= 1&srchmode=1&unlock

http://www.as.ua.edu/biology/uaic/history6.html

http://www.epa.gov/emap/maia/html/data/estuary/9798/ben_taxa.txt

http://www.seto.kyoto-u.ac.jp/publication/publication_26.htm

http://www.fauna-iberica.mncn.csic.es/htmlfauna/faunibe/zoolist/ chordata/cephalochordata.html

http://www.glomis.com/reference/T8.html

http://ww.seto.kyoto-u.ac.jp/publication/publication_25.htm

http://www.uni-hohenheim.de/~bahagish/Cephalocordata.htm