Comment, Like, & Favorite
Photograph - Photo
Sea urchins are the Class Echinoidea of the Phylum Echinodermata. Like the rest of the Echinoderms, literally "spike-skinned", they are entirely marine. They are usually globe-shaped, and protected by calcareous plates and spines.p65 Urchin is an old word for hedgehog, and in many foreign languages these animals are called as "sea hedgehogs".
Like other echinoderms they have five-fold symmetry (called pentamerism) and move by means of hundreds of tiny, transparent, adhesive 'tube feet'. The symmetry is not obvious in the living animal, but is easily visible in the dried test.
Sea urchins mostly feed on algae and small animals. They have a special chewing apparatus called Aristotle's lantern, after the Greek philosopher Aristotle who was fascinated by sea urchins. With this apparatus they can scrape organisms stuck to the surface over which the urchin is moving.
Sea Urchin, a prickly-looking marine animal, spherical in shape and covered with long movable spines. It somewhat resembles a hedgehog and is sometimes called the “hedgehog of the sea.” Sea urchins are found on the ocean bottom, usually near rocky shores. Sea urchins may be brown, black, purple, green, white, or red. Most are about two to four inches (5 to 10 cm) in diameter, including the spines.
In addition to its spines, the sea urchin also has pedicellariae (three-jawed pincers atop slender stalks) and tiny tube feet projecting from its body surface. The movable spines (which in some species are solid and in others hollow and filled with poison) are used for locomotion and protection. The pedicellariae (which in some species contain poison glands) are used for defense and for cleaning the body by removing larval animals and small crustaceans. The tube feet are hollow, muscular projections ending in suckers. They are flexible and can be extended beyond the spines to grip objects on the ocean floor.
March 18th, 2013
Viewed 96 Times - Last Visitor from New York, NY on 06/24/2014 at 11:44 PM
copy and paste to your website / blog - preview
maco framed prints, shells framed prints, sea shells framed prints, echinoidea framed prints, seashell framed prints, echinodermata framed prints, saltwater spike-skinned framed prints, marine framed prints, sea hedgehogs framed prints, sand dollars framed prints, sensational framed prints, spectacular framed prints, awesome framed prints, magnificent framed prints, peaceful framed prints, inspirational framed prints, haybales framed prints, canon shooter framed prints, panoramic framed prints, wow framed prints, stupendous framed prints, superb framed prints, tranquil framed prints, marine framed prints, low tide framed prints, maco greeting cards, shells greeting cards, sea shells greeting cards, echinoidea greeting cards, seashell greeting cards, echinodermata greeting cards, saltwater spike-skinned greeting cards, marine greeting cards, sea hedgehogs greeting cards, sand dollars greeting cards, sensational greeting cards, spectacular greeting cards, awesome greeting cards, magnificent greeting cards, peaceful greeting cards, inspirational greeting cards, haybales greeting cards, canon shooter greeting cards, panoramic greeting cards, wow greeting cards, stupendous greeting cards, superb greeting cards, tranquil greeting cards, marine greeting cards, low tide greeting cards, maco prints, shells prints, sea shells prints, echinoidea prints, seashell prints, echinodermata prints, saltwater spike-skinned prints, marine prints, sea hedgehogs prints, sand dollars prints, sensational prints, spectacular prints, awesome prints, magnificent prints, peaceful prints, inspirational prints, haybales prints, canon shooter prints, panoramic prints, wow prints, stupendous prints, superb prints, tranquil prints, marine prints, low tide prints, maco posters, shells posters, sea shells posters, echinoidea posters, seashell posters, echinodermata posters, saltwater spike-skinned posters, marine posters, sea hedgehogs posters, sand dollars posters, sensational posters, spectacular posters, awesome posters, magnificent posters, peaceful posters, inspirational posters, haybales posters, canon shooter posters, panoramic posters, wow posters, stupendous posters, superb posters, tranquil posters, marine posters, low tide posters