Elementary entomology elementaryentomo00sand Year: [c1912] ELEMENTARY ENTOMOLOGY The Invertebrata are divided into several branches, or phyla (sin- gular, phylum), which divisions are based on fundamental differences in the body structure of the animals in these groups. Of these phyla there are two which have the body made up of a series of segments and were at one time classed together as the Articulata. FIG. 3. A lobster; a typical crustacean The first of these two phyla, the Vermes, or worms, has no jointed appendages, while the second, the Arthropoda, is characterized by having jointe
Elementary entomology elementaryentomo00sand Year: [c1912] ELEMENTARY ENTOMOLOGY The Invertebrata are divided into several branches, or phyla (sin- gular, phylum), which divisions are based on fundamental differences in the body structure of the animals in these groups. Of these phyla there are two which have the body made up of a series of segments and were at one time classed together as the Articulata. FIG. 3. A lobster; a typical crustacean The first of these two phyla, the Vermes, or worms, has no jointed appendages, while the second, the Arthropoda, is characterized by having jointed appendages on either several or all segments of the body, from which the term 'Arthropoda,' from art/iron (joint) and pous (foot), is derived. The Arthropoda include the insects, spiders, myriapods, and crustaceans, all of which are related by the possession of these jointed appendages. The distinctions between
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