Arthropods are the group of animals that have jointed appendages. They are distinguished from other animals by their external skeletons and segmented bodies. Arthropods include beetles, spiders, crabs, scorpions and centipedes.Know More
All arthropods are made up of segments, and each segment contains a pair of appendages, even if the segments have become fused together to form what looks like a single mass. The appendages themselves are segmented. Some are uniramous, meaning that the segments do not branch, while other are biramous, meaning that the appendage contains branches.
The segments of an arthropod function as the bones do in a human or other similar creature. They are made up of chitin, a tough fibrous substance that is flexible yet strong. The muscles that power each appendage attach to the inner wall of the segments, a situation exactly opposite to that seen in humans, where the muscles lie on top of rather than inside of the structures to which they attach.
The appendages of arthropods include but are not confined to legs. The antennae or feelers present on many insects and crustaceans are actually modified appendages, and so are the spinnerets of spiders. Maxillae, which resemble jaws, and mandibles, which resemble large fangs, are appendages modified for chewing and biting. Some arthropods have appendages that function as reproductive organs.Learn more about Zoology
Insects belong to the largest phylum of the animal kingdom and are called arthropods. According to the Encyclopaedia Britannica, insects are members of the Arthropoda phylum and make up 84 percent of all the known animals on Earth.Full Answer >
Animals are an integral part of the Earth's ecosystem. Each organism in the ecosystem plays a role in supporting the ecological community, which means that animals play a vital role as well. Each organism in the ecosystem depends on the other organisms in the system to play its role. Without animals, there would be dysfunction within the system and human life would be disrupted.Full Answer >
There are many species of animals on Earth that spend the majority of their lives alone, including species of reptiles, amphibians, mammals, fish, insects and arachnids. Solitude is common in the animal world, and it may be only during the mating season that individual members of a species interact with each other.Full Answer >
Bears, deer and wolves are examples of omnivores, herbivores and carnivores respectively. Many animals that are considered carnivores, such as foxes, actually eat plants as well. Not only do red foxes eat fruit, but they sometimes eat carrion.Full Answer >