A close-up of the icicle-like matrix of glass sponge spicules with a shrimp perched inside.
Glass Sponge Spicules
Image courtesy of the NOAA Office of Ocean Exploration and Research, Discovering the Deep: Exploring Remote Pacific MPAs. Download larger version (jpg, 1.5 MB).

A close-up of the icicle-like matrix of glass sponge spicules with a shrimp perched inside.

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