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to the others. The primary tubercles form an alternate series down the perradius. These traits distinguish this genus from Plesiodiadema and Gymnotiara...3 KB (217 words) - 10:52, 27 January 2024
- perradius (plural perradii) Any of the primary rays of a medusa
- the left in the plane of an interradius, to the right in the plane of a perradius. SU, Subumbrella. Ma, Manubrium. EAx, Axial enteron. Gh and Fg, Gastral