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AMPHIBIANS
EXPLORE > ANIMALS
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Invertebrates make up 97% of all animals on Earth. Invertebrates lack backbones and therefore the category includes all animals that are not vertebrates.
ARTHROPODS (Arthropoda): 
Arthropods are animals with an external skeleton called an exoskeleton, a segmented boys and paired jointed appendages. The hard exterior is made of chitin, a material similar to that of your fingernails, which they will periodically moult. This phylum includes insects, arachnids (spiders), myriapods (millipedes, centipedes, etc.) and crustaceans.
Bathypalaemonella
Caddisfly
Great Basin spadefoot toad
Helmet crab
Leaf barnacle
Red rock crab
Squat lobster
Bay ghost shrimp
California mussel
Giant acorn barnacle
Hobo spider
Oregon pink shrimp
Seaside hoary elfin butterfly
Yellow sac spiders
Black widow spider
Dragonfly
Giant acorn barnacle
Horseshoe crab
Oregon silverspot butterfly
Sharp-nosed crab
Box crab
Dungeness crab
Hairy hermit crab
Japanese spider crab
Seaside hoary elfin butterfly
Spot prawn
CHORDATES:
A chordate is an invertebrate which possesses a notochord, a cartilaginous skeletal rod which supports its body during some phase of its lifecycle. Their body structure includes filter feeder organs (similar to a mouth) at one end and an anus at the other.
Stalked tunicates
CNIDARIANS:
This phylum contains over 10,000 aquatic (freshwater and marine) species. Distinguishing features of these animals are specialized cells called cnidocytes which are used for stinging or capturing prey. Their bodies consists of a jelly-like substances (thus, many in this phylum are referred to as "jellies") with outer layers of connective tissue. These animals may swim freely or be attached to the ocean floor or other substrates. Their mouths are surrounded by tentacles. 
Bamboo coral
Lophelia pertusa
Lion's Mane Jelly
Moon jelly
By the wind sailor
Sea pen
Lion's Mane Jelly
Lion's Mane Jelly
ENCHINODERMS:
This phylum consists of marine invertebrates such as sea stars, sea urchins, or sea cucumbers. The adults are recognizable by their (usually five-point) radial symmetry. There are approximately 7,000 known species in this phylum and they can be found at every ocean depth from tide pools to trenches. There are no known examples of freshwater or terrestrial echinoderms. 
Bat star
Christmas anemone
Plumose Anemone
Sand dollar
Blood star
Giant green anemone
Proliferating anemone
Strawberry anemone
Burrowing Sea Cucumber
Leather star
Purple sea urchin
Sunflower star
California Sea Cucumber
Ochre star
Red sea urchin
Venus flytrap anemone
MOLLUSKS:
This is the second largest phylum of invertebrate animals with around 85,000 known species. About a quarter of all known marine organisms are mollusks with many more residing in both freshwater and terrestrial ecosystems. As a group, they are highly diverse in size, anatomical structure, behavior and habitat. Cephalopod mollusks, such as squid, cuttlefish and octopus, are neurologically advanced and highly intelligent.
Common garden snail
Giant rock scallop
Lewis's Moon Snail
Pacific sideband snail
Cuttlefish
Giant squid
Pacific sideband snail
Lewis's Moon Snail
Gumboot chiton
Red octopus
Giant Pacific octopus
Great blue heron
Sea lemon
SPONGES:
Also known as Poriferans, these are sessile (they do not move) multicellular organisms which can be found in both marine and freshwater environments. Their bodies are cylindrical, asymmetrical or have a radial symmetry. They have a unique feeding strategy for animals in that sponges do not have mouths. Rather they raw in and filter nutrients out of the water through tiny pores on their outer walls. Water is then expelled, along with wastes, through larger pores. Sponges are one of the oldest marine species on earth.
Red octopus
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