Diadema antillarum
Long-spined Sea Urchin
Maximum Size:
3 in (7.5 cm) in diameter, excluding spines.
Longevity:
Up to 5 years.
Typical depth:
0–1312 ft (0–400 m)
Behavior:
Long-spined sea urchins eat algae and detritus (dead and decaying matter). They are most active at night when they move around the reef using a combination of spines and tube feet (known as podia). During the day, they hide in reef cracks and crevices.
Predators:
Crabs, starfish, but also Queen triggerfish and Spanish hogfish.
Did you know?
Long-spined sea urchins help control algae growth on Caribbean coral reefs, which in turn promotes coral growth. They were one of the greatest consumers of algae on Caribbean coral reefs until a pathogen killed off 95 per cent of the population in 1984. As a result, algae cover has more than doubled across the region since then, negatively impacting corals.
WARNING!
Sea urchin spines break off easily upon contact and can become embedded in the skin. They also secrete a mild toxin that can make such an injury very painful.
TREATMENT
If you accidentally brush up against an urchin, exit the water as soon as possible. Use tweezers to remove any spines that protrude from the skin. A mild acid, such as lemon juice or vinegar, may also bring relief from the toxin. Seek medical attention for severe injury.
MEDICAL DISCLAIMER
The treatment advice contained in this book is meant for informational purposes only and is not intended to be a substitute for professional medical advice, either in terms of diagnosis or treatment. Always seek the advice of your physician or other qualified health provider if you are injured by a marine organism. Never disregard professional medical advice or delay seeking it because of something you have read in this book.
