Named for their siliceous skeletons, glass sponges lack an outer layer, and have spicules (tiny 'needle-like' structures) that support the body’s shape and that form a latticework. They are usually cylindrical, or funnel-shaped. Most species live in deep waters and are common in Antarctic waters.
Porifera (sponges), class: Hexactinellida
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Photo by Mark Salotti