Easily differentiated from all other echinothurioids by its crenulate tuberculation, the alternating primary and demi-plates throughout most of the ambulacra, and the presence of 10 large buccal plates on the peristome. The presence of buccal plates and the crenulate tubercles are characters Kamptosoma shares with diadematoids.
Although Fell (1966) placed Kamptosoma in the Diadematoida, Mortensen (1935) and Mironov (1972) both preferred to retain it in the Echinothurioida.
Mironov, A. N. 1972. On relationship of the group of flexible urchins and systematic status of the genus Kamptosoma Mortensen (Echinoidea, Echinothuriina). Zoologiske Zhurnal 51, 381-387 [in Russian].
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. II. Bothriocidaroida, Melonechinoida, Lepidocentroida, and Stirodonta. C. A. Reitzel, Copenhagen, 647 pp.
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.