Differs from Araeosoma in having primary tubercles absent from perradial and interradial zones, leaving broad naked bands and in having highly derived dactylous pedicellariae. It also has ambulacral plates continuing onto the peristome as a single series in each half ambulacrum in contrast to the double series seen in Calveriosoma and Araeosoma. However, the species included in this genus are relatively small.
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.
Shigei, M. 1986. The sea urchins of Sagami Bay. Maruzen Co., Tokyo.