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2008-10-02 03:00:25

By Alvarado, Juan Jose Abstract: Between October 2003 and July 2005, aggregation behavior of the sea urchin Astropyga pulvinta Lamarck was studied in Bahia Culebra, Costa Rica. This sea urchin forms aggregations during part of the year and then disappears. I quantified the number of individuals present in a defined area each month, their aggregation behavior between day and night, and their size. Also, temperature and nutrient concentrations of the water were sampled. There were...


Latest Diadema Reference Libraries

Diadema setosum
2013-11-21 12:27:30

Diadema setosum is a species of long-spined sea urchin in the family Diadematidae. It’s a typical sea urchin, which exceptionally long and hollow spines that are mildly venomous. D. setosum is different from other Diadema with five distinctive white colored dots that can be found on its body. The species is located throughout the Indo-Pacific region, from Australia and Africa to Japan and the Red Sea. Although it is capable of painful stings when stepped upon, the urchin is only somewhat...

Red Urchin, Astropyga radiata
2013-11-14 12:40:05

The Red Urchin, False Fire Urchin, Fire Urchin or Blue Spotted Urchin (Astropyga radiata) is a species of sea urchin belonging to the family Diadematidae. It’s a large species with long spines and is found within the tropical Indo-Pacific region. It was initially described in 1778 by the German naturalist Nathaniel Gottfried Leske. This species is a large urchin with a test diameter of up to 8 inches, flattened or slightly concave on the aboral, meaning upper, side. The spines are up to...

Hatpin Urchin, Centrostephanus longispinus
2013-11-14 12:05:28

The Hatpin Urchin (Centrostephanus longispinus) is a species of sea urchin belonging to the family Diadematidae. There are two subspecies, Centrostephanus l. longispinus, found in the eastern Atlantic and Mediterranean Sea and Centrostephanus I. rubricingulus, found in the western Atlantic. In the year 1940, Mortenson believed that C. longispinus and C. rubricingulus were closely related species but that they could be distinguished due to the fact that C. longispinus has smaller and fewer...

Black Sea Urchin, Diadema antillarum
2013-11-06 11:22:21

Diadema antillarum, known also as the Lime Urchin, the Long-Spined Sea Urchin, or the Black Sea Urchin, is a species of sea urchin belonging to the family Diadematidae. It is characterized by its extremely long black spines. This species is the most plentiful and significant herbivore on the coral reefs of the western Atlantic and Caribbean basin. Then the population of these sea urchins is at a healthy level, they’re the main grazers which prevent algae overgrowth of the reef....

Diadema setosum
2013-04-30 15:23:43

Diadema setosum is a species of sea urchin that can be found in Indo-Pacific waters. Its range extends from the Red Sea to coasts of Australia in the east, and from Japan in the north to the east coast of Africa in the south. There have been a few individuals found outside of this natural range, leading experts to believe that it was introduced by natural or manmade causes. Two individuals were found off the coast of the Kaş peninsula in Turkey in 2006. These individuals represent the first...

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Word of the Day
holluschickie
  • A 'bachelor seal'; a young male seal which is prevented from mating by its herd's older males (mated bulls defending their territory).
This comes from the Russian word for 'bachelors.'
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