Distinguished from Calocidaris by having denser coalesced cortical hairs forming a smooth surface to its primary spines. Its ambulacral spines are also more adpressed and it has two distinct forms of tridentate pedicellaria. See Coppard & van Noordenburg (2007) for a full discussion of this genus.
Coppard, S. E. & van Noordenburg, H. 2007. A new species of Lissocidaris (Echinodermatat: Echinoidea: Cidaridae) from the Philippines: convergent evolution among smooth-spined cidaroids. Zootaxa 1493, 53-65.
Mortensen, T. 1928. A monograph of the Echinoidea. 1, Cidaroidea. C. A. Reitzel, Copenhagen.