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Similar to Spongodiscus resurgens, except for the presence of spines on the surfaces and/or on the margins of the disc (lentelliptical shell 2). Can have an inconspicuous pylome. Diameter of disc (without spines): 100-500 µm.

Ref.: Riedel (1958), Petrushevskaya (1967).

Spongotrochus glacialis