Invertebrate

An invertebrate (in contrast to a vertebrate), is an animal with no spine.^[1]

Most living animals are invertebrates, including arthropods, molluscs, and annelids.

The phyla contained in Invertebrata are:

• Protozoa - Mostly simple, single-celled organisms
• Porifera - Sponges
• Coelenterata - Hydra, jellyfish, anemones and corals
• Echinoderma - Starfish, sea urchins and sea cucumbers
• Annelida - Worms
• Brachiopoda - Bivalves, such as mussels and clams
• Polyzoa - Single celled critters that usually form colonies
• Mullusca - Whelks, ammonites, cuttlefish, squids, snails, etc.
• Arthropoda - Crustaceans, insects, arachnids, trilobites, etc.^[2]

References[edit]

1. ↑ Wile, Dr. Jay L. Exploring Creation With Biology. Apologia Educational Ministries, Inc. 1998
2. ↑ Invertebrate Paleontology, Henry Woods, Cambridge University Press, 8th Edition (1946)