Morphology of the stem in Cambrocrinus regularis Orlowski 1968 from the early Late Cambrian of the Holy Cross Mts, with only one type of columnals in its proximal conical part but with well developed marginal fulcra connecting them
alternately in pairs, places it in between the Middle Cambrian Acadocrinus and Late Cambrian Ridersia. In the presence of thecal ribbing with ribs radiating toward plate comers, which is definitely not homologous to the ribbing of Ridersia,
Macrocystella, and later cystoids, it departs from the main eocrinoid lineage leading to the rhombiferans. A new family Cambrocrinidae is therefore proposed to include Cambrocrinus and Eocystites