Like Lenita in having a distinct bilateral symmetry to its oral tuberculation but differing from that genus in having an oral rather than aboral periproct. Leniechinus differs from Lenicyamidia in having radial partitions developed internally. The apical disc was originally shown as tetrabasal, but Philip (1966) pointed out that this was wrong and that the disc was monobasal. The bare sagittal zone on the oral surface distinguishes this genus from all other Fibulariidae.
Brunnschweiler, R. O. 1962. On echinoids in the Tertiary of western Australia with a description of two new Eocene Fibulariidae. Journal of the Geological Society of Australia 18, 159-169.
Philip, G. M. 1966. Notes on three recently proposed Australian Tertiary echinoid genera. Proceedings of the Linnean Society of New South Wales 91, 114-117.