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Harp sponge (Chondrocladia lyra). The newly described invertebrate isn't so benign. Rather than filtering the water for bacteria and other single-celled organisms like most sponges do, the harp sponge employs Velcro-like barbs on its vertical branches to snag tiny crustaceans called copepods as they swim past. Then, cells specialized for digesting prey surround the captured swimmer and slowly start to digest it.
Diatoms are microscopic algae composed of separate halves, with delicate siliceous cell walls. They're usually single-celled organisms, though some live colonially. They inhabit fresh and salt waters and are among the most abundant of all phytoplankton.
Diatoms are microscopic algae. They inhabit fresh and salt waters and are among the most abundant of all phytoplankton. An example of diatom art—practiced since Victorian times—of arranging diatoms pleasingly. Thanks, freaky Victorians!