Differs from Heterocentrotus Brandt, 1835, in possessing finer spines and a distinct marginal frill of longer subambital spines. Its secondary spines are not reduced to peg-like structures. Also may differ from Heterocentrotus and Podophora in orientation of the major axis of its test. In Zenocentrotus, according to Clark, the major axis passes through Amb. IV - Iamb. 1, whereas in Heterocentrotus and Podophora the major axis is through Amb. II - Iamb. 4. However, the orientation of the major axis in these taxa can be difficult to measure precisely, and there may be some intraspecific variation. In other respects the test architecture appears identical. Forms a clade with Heterocentrotus, Podophora and Colobocentrotus.
Clark, A. H. 1931. Echinoderms from the Islands of Niuafoou and Nukualofa, Tonga Archipelago. Proceedings of the U.S. National Museum 80(5), 1-12, pls 1-8.
G. Philip (1965 The Tertiary echinoids of south-eastern Australia III Stirodonta, Aulodonta, and Camarodonta (1). Proceedings of the Royal Society of Victoria 78, 181-196) described a possible fossil recpresentative of this genus based on spines and test fragments.