Mollusks & Crustaceans
Mollusks and echinoderms, crustaceans and other marine arthropods.
Confused? See below.
Atlantic Ghost Crab (Ocypode quadrata). This is the only species of ghost crab on the East Coast. It makes little burrows in the sand to hide. Florida Keys, Florida. Jan, 2011.
Land Hermit Crab (Coenobita clypeatus). This hermit crab lives in a variety of shells and may be seen walking beaches and climbing trees. Florida Keys, Florida. Jan, 2011.
Atlantic Horseshoe Crab (Limulus polyphemus). The horseshoe crab is more closely related to arachnids than crabs. It also has remained essentially unchanged for 450 million years. They also have blue, copper-based blood. Rehoboth Beach, Delaware. Aug, 2010.
Turkey Wing Arc Clam (Arca zebra). One of the more eye-catching clams. Florida Keys, Florida. Jan, 2011.
Banana Slug (Ariolimax columbianus). One of three banana slug species on the west coast of North America. This terrestrial mollusk is very slow moving, but fascinating in form and function. Seen here on a fern–side fringes are normally smooth. Olympic National Park, Washington. September, 2011.
Crustaceans: includes crabs, lobsters, shrimp, crayfish, barnacles, and others. Crustaceans have an exoskeleton and usually three body segments. Crustaceans are arthropods related to spiders and insects.
Other Arthropods: such as the horseshoe crab. Included also are some insects and arachnids that are strictly marine. Other insects and arachnids can be found here: Insects & Arachnids.
Mollusks: includes squids, octopus, snails, slugs, mussels, clams, oysters, and others. Mollusks are anatomically diverse, but usually have a shell or mantle, a foot, and a visceral mass containing body organs. Mollusks are mostly aquatic, though some are terrestrial.
Echinoderms: includes starfish, sea urchins, sea cucumbers, sand dollars, and others. Echinoderms are all marine organisms–none are terrestrial and none live in freshwater. Echinoderms have a radial symmetry unusual to bilateral symmetry in most animals.