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A typical sea anemone is a sessile polyp attached at the base to the surface beneath it by an adhesive foot, called a basal or pedal disc, with a column-shaped body topped by an oral disc. Most are from 1 to 5 cm (0.4 to 2.0 in) in diameter and 1.5 to 10 cm (0.6 to 3.9 in) in length, but they are inflatable and vary greatly in dimensions.
The starlet sea anemone is used as a model organism in research. [34] It is easy to care for in the laboratory and a protocol has been developed which can yield large numbers of embryos on a daily basis. [35] There is a remarkable degree of similarity in the gene sequence conservation and complexity between the sea anemone and vertebrates. [35]
The name urchin is an old word for hedgehog, which sea urchins resemble; they have archaically been called sea hedgehogs. [ 6 ] [ 7 ] The name is derived from the Old French herichun , from Latin ericius ('hedgehog').
Diadema antillarum, also known as the lime urchin, black sea urchin, or the long-spined sea urchin, [2] is a species of sea urchin in the family Diadematidae. This sea urchin is characterized by its exceptionally long black spines. It is the most abundant and important herbivore on the coral reefs of the western Atlantic and Caribbean basin.
If the sea urchin comes into contact with the tentacles of the sea anemone, it may be unable to tear itself free, however, if it is swathed in seaweed fragments or concealed among the seaweed fronds, the sea anemone's tentacles may adhere to the algal material, enabling the sea urchin to make good its escape. [5]
Urticina eques in a Channel Islands sea bottom rich in marine life. Also seen are a purple sea urchin, a chestnut cowrie, and many strawberry anemones. Urticina eques is dioecious. In California, female ripeness occurs in December as the sea temperature begins to fall.
For marine scientists, it was deja vu: Another die-off swept through the region in the 1980s and slashed sea urchin populations by around 98%. Last year, sea urchins in the Caribbean started ...
Toxopneustes pileolus, commonly known as the flower urchin, is a widespread and commonly encountered species of sea urchin from the Indo-West Pacific. It is considered highly dangerous, as it is capable of delivering extremely painful and medically significant stings when touched.