Differs from Echinothuriinae in lacking membranous gaps between interambulacral plates and in having the three pore-pairs not forming three series in each half-ambulacrum. Differs from the fossil Echinothuria in having pore-pairs uniserial across the oral surface with accessory plates reaching the adradial suture.
Mooi et al (2004) provide a cladistic analysis of this genus and its species.
Mooi, R., Constable, H., Lockhart, S. & Pearse, J. 2004. Echinothurioid phylogeny and the phylogenetic significance of Kamptosoma (Echinoidea: Echinodermata). Deep Sea Research II 51, 1903-1919.
Mortensen, T. 1903. The Danish Ingolf-Expedition 1895-1896. Vol. 4, No. 2. Echinoidea, pt. 1, 198 pp., 21 pls. Bianco Luno, Copenhagen.
Mortensen, T. 1935. A monograph of the Echinoidea. Volume 2, Bothriocidaroida, Melonechinoida, Lepidocentroida and Stirodonta. C.A. Reitzel, Copenhagen.