Diadema setosum - Black Longspine Urchin
Family - Temnopleuridae
Order - Temnopleuroida
Length - Up to 14 inches
Recognition - Long black spines with a fake eye on the body.
Habitat - Tropical saltwater bodies
Behavior - Herbivore
Residency - Warm parts of the ocean
Life Span - Up to 5 years
Of Special Note - The black longspine urchin is a very interesting addition to any aquarium. Unlike other urchins, this species has very long spines with a tiny body in the middle. It is a bit clumsy and can knock over rockwork and coral while moving around.
This species is a herbivore and feeds on algae that lives on the rock in the aquarium. It is venomous and you should take care not to be jabbed by its spines. If you are accidentally stabbed, attempt to extract the spines from the site of injury. You can apply a mild acid in the form of vinegar or even urine to help dissolve the barbs and reduce the stinging sensation. Despite the danger of its venom, the species is quite docile and will normally not attack other creatures except in defense.
It should be noted that this creature can grow very large and can sometimes outgrow a 75 gallon tank. As a result, you should account for the possibility of having to sell it to a friend or fish shop if it becomes too large.
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