After Parker, 1982 and “The CAS Echinoderm webpage”, 1998
<==o Echinoidea (sea urchins; merisiilit) |--o Perischoechinoidea | `--o Cidariida [Cidaroida] | |-- Cidaridae | `-- Psychocidaridae `--o Euechinoidea ()? [paraphyletic?] |-- Gnathostomata [non Gnathostomata (jawed vertebrates) (ICZN rules; article 1b4)] `-- Atelostomata
Reference(s):
- Anonymous, 1998: The CAS Echinoderm webpage.
–iNet: California Academy of Sciences: http://www.calacademy.org/research/izg/echinoderm/classify.htm [visited: 2002-5 October] - Parker, S. P. (ed.), 1982: Synopsis and classification of living organisms. Vols. 1 & 2
–McGrew-Hill Book Company