| +-- Heliasteridae (p. 474). | +-- Zoroasteridae (p. 474). | +-- Stichasteridae (p. 474). | +-- Pedicellasteridae (p. 474). | +-- Brisingidae (p. 474). +-- OPHIUROIDEA (pp. 431, 477) | +-- STREPTOPHIURAE (p. 494) | +-- ZYGOPHIURAE (pp. 494, 495) | | +-- Ophiolepididae (p. 495). | | +-- Amphiuridae (p. 497). | | +-- Ophiocomidae (p. 499). | | +-- Ophiothricidae (p. 499). | +-- CLADOPHIURAE (pp. 494, 500) | +-- Astroschemidae (p. 501). | +-- Trichasteridae (p. 501). | +-- Euryalidae (p. 501). +-- ECHINOIDEA (pp. 431, 503) | +-- ENDOCYCLICA (pp. 529, 530) | | +-- Cidaridae (p. 533). | | +-- Echinothuriidae (p. 535). | | +-- Saleniidae (p. 537). | | +-- Arbaciidae (p. 538). | | +-- Diadematidae (p. 538). | | +-- Echinidae (p. 539) | | +-- Temnopleurinae (p. 539). | | +-- Echininae (p. 539). | +-- CLYPEASTROIDEA (pp. 529, 542) | +-- Protoclypeastroidea (p. 548). | +-- Euclypeastroidea (p. 549) | +-- Fibularidae (p. 549). | +-- Echinanthidae | | = Clypeastridae (p. 549). | +-- Laganidae (p. 549). | +-- Scutellidae (p. 549). +-- SPATANGOIDEA (pp. 529, 549) | | Asternata (p. 554). | +-- Echinonidae (p. 553) ------+ | +-- Nucleolidae (p. 554) ------+ | +-- Cassidulidae (p. 554) -----+ | | Sternata (p. 554). | +-- Ananchytidae (p. 554) -----+ | +-- Palaeostomatidae (p. 554) -+ | +-- Spatangidae (p. 554) ------+ | +-- Brissidae (p. 556) --------+ | +-- _Archaeocidaridae_ (p. 557). | +-- _Melonitidae_ (p. 557). | +-- _Tiarechinidae_ (p. 557). | +-- _Holectypoidea_ (p. 558).