![]() It allows them to move in a very specific and coordinated way. Lower invertebrates have a segmented body. Many characteristics of lower invertebrates make them unique and interesting creatures. The Characteristics of Lower Invertebrates These animals share a common ancestry with the higher vertebrates (mammals, reptiles, birds and fishes) but diverged from this lineage early in evolutionary history. The lower invertebrates include all invertebrate animals except the protostomes (which include insects, crustaceans, myriapods, molluscs, annelids and arthropods). And still, others are important food sources for other animals. Other invertebrates help control populations of pests and disease-carrying organisms. Many invertebrates are essential for decomposing dead plants and animals, which recycle nutrients into the soil. Invertebrates are an extremely diverse group of animals, and they play important roles in nearly every ecosystem. Invertebrates can be found on every continent and in almost every environment, from the coldest polar regions to the hottest deserts. There are several thousand known species of invertebrates, making up most of the animal kingdom. "invertebrate" comes from the Latin word vertebra, which means "a joint in the back." Invertebrates include terrestrial and aquatic animals, coming in all shapes and sizes. The Characteristics of Lower Invertebrates. ![]()
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