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Meoma Ventricosa
''Meoma ventricosa'', known by the common names cake urchin and red heart urchin, is a large species of sea urchin which lives in shallow waters in the Caribbean. It may reach a diameter of twenty centimeters and is covered in reddish-brown spines. It has both pentagonal radial symmetry and bilateral symmetry, giving it a sand-dollar appearance; however, two of its five sections are merged more closely than the others. Subspecies There are two subspecies: *''Meoma ventricosa grandis'' Gray, 1851 *''Meoma ventricosa ventricosa'' (Lamarck, 1816) Description The red heart urchin has a somewhat flattened, heart-shaped test made of closely fitting, calcium carbonate plates. These are covered by short, dense, moveable spines situated on small tubercles. The test is a dark reddish-brown colour and the spines a little paler. Although it has pentagonal radial symmetry, it also has some degree of bilateral symmetry as one of the Ambulacral, interambulacral areas is undeveloped and only fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animalia
Animals are multicellular, eukaryotic organisms in the Biology, biological Kingdom (biology), kingdom Animalia (). With few exceptions, animals heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, have myocytes and are motility, able to move, can reproduce sexually, and grow from a hollow sphere of Cell (biology), cells, the blastula, during embryonic development. Animals form a clade, meaning that they arose from a single common ancestor. Over 1.5 million extant taxon, living animal species have been species description, described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from to . They have complex ecologies and biological interaction, interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
