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Two concentric shells. Medullary shell composed of a loose network of thin anastomosing bars. Outer shell similar to that of Heliaster hexagonium, except for the presence of many (>6) long, 3-bladed primary spines. Outer shell diameter without spines: ca. 160 µm.

Ref.: Hollande and Enjumet (1960).

Heliosoma echinaster