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itis.gov
Echinoidea, [w:] Integrated Taxonomic Information System(ang.).
Nicolás MongiardinoN.M.KochNicolás MongiardinoN.M. i inni, A phylogenomic resolution of the sea urchin tree of life, „BMC Evol Biol”, 18, 2018, s. 189, DOI: 10.1186/s12862-018-1300-4, PMID: 30545284(ang.).
Maximilian J.M.J.TelfordMaximilian J.M.J. i inni, Phylogenomic analysis of echinoderm class relationships supports Asterozoa, „Proceedings of the Royal Society B: Biological Sciences”, 281 (1786), 2014, s. 20140479, DOI: 10.1098/rspb.2014.0479, PMID: 24850925(ang.).