Arachnoididae Duncan, 1889 accepted as Arachnoidinae Duncan, 1889 (original description)
Arachnoidinae Duncan, 1889 (original description)
Cardiaster (Infulaster) Desor, 1858 † accepted as Infulaster Desor, 1858 † (basis of record)
Encope stokesii L. Agassiz, 1841 accepted as Mellitella stokesii (L. Agassiz, 1841) (status source)
Eodiadema Duncan, 1889 † accepted as Glyptodiadema Pomel, 1883 † (original description)
Goniopneustes Duncan, 1889 (original description)
Hagenowia Duncan, 1889 † (original description)
Infulaster rostratus (Forbes, 1852) † accepted as Hagenowia rostrata (Forbes, 1852) † (status source)
Mellitella Duncan, 1889 (original description)
Mellitella stokesii (L. Agassiz, 1841) (new combination reference)
Pseudasterostoma Duncan, 1889 † accepted as Prosostoma Pomel, 1883 † accepted as Paleopneustes A. Agassiz, 1873 (original description)

 Authority

 for Spatangus (Loncophorus) Studer, 1881

Originally attributed to Laube (1868) by Studer, but no mention of that name has been found in the cited work, nor ... [details]

 Diagnosis

 for Mellitella Duncan, 1889

All the ambulacral lunules as open slits in the margin. Genital pores four in number. Peristome and apical system ... [details]