Diagnosis
provided by World Register of Marine Species
Members of Lanthonia possess diagnostic features of the family Mellitidae, but are distinguished from members of Mellita by the presence of very narrow ambulacral regions between the food grooves and the ambulacral lunules on the oral surface, and by the structure of the bidentate pedicellariae which have simple valves (with no projecting stereom within the blades of the valves) and small peripheral teeth present along the edge of the blade.
Coppard, S. E. (2016). A new genus of mellitid sand dollar (Echinoidea: Mellitidae) from the eastern Pacific coast of the Americas. Zootaxa. 4111(2): 158-166.
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