Sea Urchin (specifically, likely a Green Sea Urchin or similar temperate species based on appearance)
Scientific Name: There are many species of sea urchins. Without more specific visual information or location, a single scientific name is difficult to assign. Common examples that match the appearance include Strongylocentrotus droebachiensis (Green sea urchin) or Arbacia punctulata (Atlantic purple sea urchin), but it could be any of numerous species depending on geographic origin.
Order & Family: Class: Echinoidea (This is equivalent to 'Order and Family' for invertebrates like sea urchins where the class is more defining than a specific order/family without further identification)
Size: Typically, the spherical body (test) of sea urchins ranges from 3 to 10 cm (1 to 4 inches) in diameter, with spines adding a few more centimeters to the overall size. The one pictured appears to be approximately 5-7 cm in diameter.
Natural Habitat
Sea urchins are found in marine environments worldwide, from tidal pools to deep ocean floors. They prefer rocky substrates, coral reefs, and kelp forests, where they can find abundant food and shelter. They typically live attached to surfaces or nestled in crevices.
Diet & Feeding
Sea urchins are primarily herbivores. Their diet consists mainly of algae (especially kelp and other seaweeds), but they will also consume detritus, plankton, and sessile invertebrates. They use a complex chewing apparatus called Aristotle's lantern to scrape food from surfaces.
Behavior Patterns
Sea urchins move slowly using their tube feet or spines. They are primarily nocturnal grazers, preferring to feed during the night to avoid predators. Some species can burrow into soft substrates or rock to hide or create depressions for stability. They play a crucial role in maintaining the balance of marine ecosystems by grazing on algae and detritus.
Risks & Benefits
Risks: The primary risk to humans is injury from their sharp spines, which can cause puncture wounds, pain, and sometimes introduce toxins or pathogens, leading to infection or allergic reactions. Benefits: Sea urchins are vital components of marine ecosystems. They control algal growth, preventing overgrowth that can smother corals and other marine life. They are also a food source for various marine animals, including sea otters, fish, and crabs. Some species are harvested for their gonads (roe), which are considered a delicacy in certain cuisines.
Identified on: 7/4/2025