''Lissodiadema'' is the only

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

in the family Lissodiadematidae.

References

Diadematoida Taxa named by Ole Theodor Jensen Mortensen {{Echinoidea-stub