The superfamilies Gorgoncephalidea and Euryalidea proposed by Okanishi & Fujita (2013) were not supported by O'Hara et al. (2017, 2018) and are thus currently not included, awaiting further clarification.
Okanishi, M. & Fujita, T. 2013. Molecular phylogeny based on increased number of species and genes revealed more robust family-level systematics of the order Euryalida (Echinodermata: Ophiuroidea). Molecular Phylogenetics and Evolution 69: 566-580.
O'Hara, T. D.; Hugall, A. F.; Thuy, B.; Stöhr, S.; Martynov, A. V. (2017). Restructuring higher taxonomy using broad-scale phylogenomics: The living Ophiuroidea. <em>Molecular Phylogenetics and Evolution.</em> 107: 415-430.
O'Hara, T. D.; Stöhr, S.; Hugall, A. F.; Thuy, B.; Martynov, A. (2018). Morphological diagnoses of higher taxa in Ophiuroidea (Echinodermata) in support of a new classification. <em>European Journal of Taxonomy.</em> (416).