A stunning microscopic video of a juvenile black sea urchin, *Arbacia lixula*, navigating a bed of red algae has secured fifth place in the prestigious 2025 Nikon Small World in Motion competition. The footage was captured by zoologist Alvaro Migotto of the University of São Paulo, highlighting the intricate details of the marine invertebrate's delicate tube feet as they move across the algae.
The award underscores the vital role of microscopy in revealing the hidden wonders of marine biodiversity. Migotto's discovery was serendipitous, occurring while he was examining debris near the Center for Marine Biology. The video offers an intimate perspective on the sea urchin's natural behaviors, emphasizing the complexity found within even the smallest organisms.
The *Arbacia lixula*, commonly known as the black sea urchin, is found along the coasts of the Mediterranean Sea, Macaronesian Islands, and parts of Western Africa and Brazil. These urchins typically inhabit shallow, rocky waters, preferring depths from the intertidal zone down to approximately 30 meters. While adults are characteristically black, juveniles often display a reddish hue.
The Nikon Small World in Motion competition celebrates advanced imaging in scientific exploration. This recognition for Migotto's work not only highlights a moment of natural beauty captured through a scientific lens but also emphasizes the importance of continued research and exploration into marine ecosystems, revealing the intricate universes within our oceans.