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This is intended to be a complete list of the properties and districts on the National Register of Historic Places in San Diego County, California, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in an online map.
Diadema antillarum (Philippi, 1845) Gulf of Mexico Diadema ascensionis (Mortensen, 1909) Central tropical Atlantic Diadema mexicanum (Agassiz, 1863) West coast of tropical Americas Diadema palmeri (Baker, 1967) South-west Pacific, especially New Zealand Diadema paucispinum (Agassiz, 1863) Central Pacific, and possibly North Indian Ocean and ...
Diadema savignyi is a species of long-spined sea urchin belonging to the family Diadematidae. Common names include long-spined sea urchin , black longspine urchin and the banded diadem . It is native to the east coast of Africa, the Red Sea, the Indian Ocean and western Pacific Ocean.
Diadema antillarum has a "shell," similar to most other sea urchins. What distinguishes the Diadema is the length of its spines. Most sea urchin spines are 1–3 cm, but the spines in this species are usually 10–12 cm in length, and can grow as long as 30 cm in very large individuals.
Expert warns urchins vital to coral reef ecosystems now ‘functionally extinct’ in Red Sea Mysterious plague is wiping out sea urchins across the globe, scientists say Skip to main content
In 1982–1983, 50 to 90% of the corals in the region were lost. A large increase in the population of Diadema mexicanum resulted and there was an increase in damage to the reefs caused by their spines. [2] Diadema mexicanum is a herbivore and an important member of the reef community and plays a significant role in controlling algal growth. By ...
Pages in category "Diadema (sea urchin)" ... Diadema setosum This page was last edited on 11 May 2021, at 03:36 (UTC). Text is available under ...
Diadema paucispinum is a small sea urchin with very long, moveable spines which are slender and sharply pointed. They can be up to 25 cm (10 in) long and about four times the diameter of the test. The primary spines are bluish-black in colour, often with pale bands in younger individuals.