ZOO506 Midterm Merged PPT

Among the larger groups of animals now recognize~ by science, the one known as the Chordata is naturally the most familiar

Including the mammals, birds, reptiles and fishes, besides numerous forms less well known Another group, also familiar, called the Mollusca, includes the snails, clams, etc The starfish and sea urchin, often seen at the seashore, belong with other similar animals to a third group called the Echinodermata A multitude of tiny beings, almost all too small to be seen without the aid of a microscope, are included 'in the group Protozoa A fifth large group is composed mainly of soft, jelly-like animals, the more common larger members being called jellyfish, and to this group the name Coelenterata is applied. Several other groups including various kinds of worms and less familiar forms are also known The largest group of all, however, is the Arthropoda

Its members found in the seas, in fresh water, on land or even flying freely A group with remarkable differences of structure, and so abundant that all the other animals taken together are less than one-sixth as many as the arthropods