Sponges and Bryozoans Sponges are animals that live attached to the ocean floor. Click on image for a larger view Moss Animal - Heterotrypa Ordovician to Silurian Periods 408 to 505 million years ago Corals Corals are animals that live only in warm oceans. Like sponges, they are attached to the ocean floor. Kentucky Arthropods Arthropods are animals with hard, segmented shells. Insects, spiders, centipedes, crabs, lobsters, and crayfish are living examples.
Trilobites are arthropods that no longer live anywhere on earth.
They are extinct. Millard County, Utah Brachiopods Brachiopods remind us of clams, but they are not closely related. Some of the cephalapods remind us of snails, but they are actually more closely related to the octopus and squid. Late Creataceous Period - 66 to 90 million years ago England, United Kingdom Echinoderms Echinoderms are relatives of the modern starfish, sand dollars, and sea urchins. Crinoids look like flowers when they are alive, but are animals, not plants.