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any animal lacking a backbone, including all species not classified as vertebrates.
-Of the million or more animal species in the world, more than 99% are invertebrates.
-Invertebrates don't have an internal skeleton made of bone.
-Many invertebrates have fluid-filled, hydrostatic skeleton, like jellyfish and worms.
-Others have hard, outer shells, like insects and crustaceans
-Arthropods include insects,crustaceans, and arachnids.
Invertebrates are the most abundant creatures on Earth, crawling, flying, floating, or swimming in virtually all of Earth's habitat from townhouses to tropical rainforest.
*Aside from having no backbones or spinal columns, characteristics of invertebrates differ from group to group. Squids and spiders, for example, are going to differ greatly, even though they are in the same main animal group.
The following article provides an overview of characteristics of invertebrates relating to their particular species and classifications. Please note that with over 30 phylum and 2 million different species of invertebrates, this article can only touch the very tip of the world of invertebrates
any invertebrate of the phylum Arthropoda, having a segmented body, jointed limbs, and usually a chitinous shell that under goes molting, including the insects, spiders and other arachnids, crustaceans, and myriapods.
Head
–eyes, mouth, antennae etc.
Thorax
–mid-section has fused appendages.
Abdomen
–innards, genitalia, etc.
-1000 known species.
-Has 6 or more jointed legs.
-More than 3 out of 4 of animals are arthropods.
- Largest animal group on Earth.
-Spiders, Scorpions, and ticks hatch from eggs and change rapidly over time.
-Grow harder shell to protect themselves from predators.
-The time period between growing a new outer shell, the arthropods can be attacked.
Arthropods are found everywhere: on land, on trees, in freshwater and saltwater, and even underground! Arthropods are generally small. Most are sometimes less than 1 cm long. Some arthropods are quite large though. The giant king crab measures over 3.2m from the tip of one outstretched leg to the other! Insects are one of the many types of Arthropods. They have six legs and they are the only Arthropods capable of flight. Some can fly at speeds over 64 kph!
The image on the far right shows stamps with pictures of insects, such as the butterfly, dung beetle, and the grasshopper!
-lack body segments, and in most adult forms he external parts of the animal radiate from the center like spokes of a wheel.
Top left corner: Starfish, Top right corner: Sea brittle
Bottom left corner: Sea urchin, Bottom right corner: Sea anemone
-Most have a rough and spiny surface. (echinoderms=prickly skin)
-7000 known species
-Most variety
-There are 6 classes
-Cannot be found on land or fresh water.
-All echinoderms have one thing in common: radial symmetry. This means that the creatures have appendages (or body construction) which point outward from the center of the body.
-All echinoderms have a water vascular system which is a system these animals use to flex their muscles through pumping water in and out of their feet or arms.
any animal lacking a backbone, including all species not classified as vertebrates. 
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