The clear silica shell likely acts as a solar greenhouse in the cold ocean waters.

Field Notes: May 16, 2026
Location: Cabo Polonio, Rocha, Uruguay
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Encounter Summary:
The evening tide was gently receding along the rugged coast of Cabo Polonio, leaving behind a mirror of wet sand reflecting the pastel sunset. I was walking the shoreline with a local fisherman named Mateo when he pointed toward a tiny, slow-moving shape near the water's edge. At first glance, it appeared to be nothing more than a polished piece of sea glass catching the fading light.
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As I knelt on the damp sand to investigate, the shape revealed itself to be a hermit crab. But its shell was entirely transparent, a flawless, glass-like spiral that offered a completely unobstructed view of the creature's coiled, pale orange abdomen inside. The setting sun illuminated it from behind, turning the entire creature into a glowing, amber jewel against the dark beach. Another common crab scurried past, highlighting the sheer anomaly of this clear specimen.
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Mateo smiled and called them cangrejos de cristal, or glass crabs, explaining the local belief that they are born from the solidified tears of the ocean itself. I propose the classification Pagurus vitrum for this mesmerizing crustacean. Biologically, I hypothesize that instead of scavenging discarded shells, this species secretes a highly specialized, silica-based resin to construct its own housing. This transparent structure likely acts as a miniature greenhouse in the cold Atlantic waters, trapping solar radiation during the day to keep the crab warm. Furthermore, the lack of pigmentation renders it almost invisible against the wet, shimmering sand, confusing aerial predators.
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Видео The clear silica shell likely acts as a solar greenhouse in the cold ocean waters. канала Oleg Pars