Figure 4From: Comparative morphology of the axial complex and interdependence of internal organ systems in sea urchins (Echinodermata: Echinoidea)Schematic representation of the axial complex in selected echinoid taxa. The drawings concentrate on the gross morphology of the axial complex. All other internal organs are omitted, the ring canal is depicted in part only, and the anus is not shown. The legend indicates every structure shown.Back to article page