WoRMS note details

Heliometrinae with centrodorsal subconical to almost hemispherical, commonly low or with an aboral depression. Longest cirrals may be more than twice as long as wide. Brachials typically spinose.
Hess H, Messing CG (2011) Comatulida. In: Hess H, Messing CG, Ausich WI. Treatise on Invertebrate Paleontology, Part T, Echinodermata 2 Revised, Crinoidea, vol. 3. University of Kansas Press, Lawrence, Kansas, pp. 70–146.