All About Nature: Animals to Paint Online

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Some major groups of invertebrates include: Porifera (sponges), jellyfish, corals, tapeworms, flukes, insects, arachnids, crustaceans, mollusks, echinoderms, etc.
Some invertebrates include:

Ant Ants are social insects.

Arachnids Arachnids have eight jointed legs, an exoskeleton, and a two-part body. Spiders, scorpions, and ticks are arachnids.

Arthropods Invertebrates with an exoskeleton, a segmented body, and jointed legs.

Assassin Bug Assassin bugs are insects that eat other insects.

Bee Bees are flying, social insects that live in a hive.

Bivalves Bivalves are soft-bodied animals that are protected by two hard shells, hinged together.

Black Widow Spider A very poisonous spider with a distinctive red hourglass marking.

Blue Morpho Butterfly A brilliant blue butterfly from rainforests of South and Central America.

Blue Ring Octopus A small but very venomous octopus from warm reefs in Australia and nearby regions.

Brittle Star A bottom-dwelling marine invertebrate with long, spiny arms.

Butterflies and Moths Printouts about these beautiful flying insects.

Butterfly Life Cycle See how a butterfly starts out as an egg, hatches into a caterpillar, becomes a pupa, then emerges as a fully-grown adult.

Centipede Fast-moving venomous predators with many legs.

Cephalopod Cephalopods are fast-swiming mollusks.

Clam Burrowing bivalves with a soft body.

Conch A marine invertebrate with a large, beautiful shell.

Copepod Copepods are tiny crustaceans from fresh and salt water.

Coral Coral is a tiny marine animal that often lives in colonies. Huge colonies of hard corals form coral reefs.

Crab A crab is an animal with a shell. It has eyes on stalks on its head.

Crayfish Freshwater crustaceans with four pairs of walking legs.

Crustaceans Crustaceans are animals with a hard exoskeleton, jointed legs, and a segmented body.

Cuttlefish Cuttlefish are cephalopods with relatively short legs, a fin along the entire mantle, and an internal cuttlebone.

Dragonfly The dragonfly is a flying insect with a long abdomen.

Earthworm An earthworm is a little animal with a long, soft body and no legs.

Echinoderms Spiny-skinned, bottom-dwelling marine invertebrates with five-fold symmetry.

Gastropods Gastropods are a class of mollusk with a single (or absent) shell and a muscular foot.

Giant Squid Giant Squid swim deep in the oceans. They have ten arms and their eyes are the size of basketballs.

Grasshopper Grasshoppers are insects that can hop, walk, and fly. There are about 10,000 different species of grasshoppers.

Harlequin Bug This small agricultural pest is brightly-colored.

Hermit Crab Hermit crabs are crabs that lack a hard shell; they use a discarded shell for protection.

Horseshoe Crab The horseshoe crab is a hard-shelled animal that lives in warm coastal waters on the sea floor.

Insects Insects have a hard exoskeleton, a three-part body, and six legs.

Jellyfish Jellyfish are soft-bodied animals that have stinging tentacles.

Jumping Bean Moth A brown moth that spends its larval stage inside a plant's seed pod.

Krill Small crustaceans that are eaten by many animals, including baleen whales.

Ladybug Tiny flying insects that eat garden pests.

Limpet The limpet is a marine invertebrate (a gastropod) with a flattened, cone-shaped shell.

Lobster A hard-shelled marine invertebrate with 10 jointed legs.

Luna Moth A green moth with long hindwing tails and distinctive eyespots.

Man-of-War The Portuguese man-of-war is a floating colony of animals that has very long, stinging tentacles. It lives in warm ocean waters.

Mollusks Mollusks are soft-bodied invertebrates. Some mollusks include the octopus, squid, clam, snail, slug, and tusk shells.

Mosquito A small flying insect that is a carrier of disease.

Octopus Octopi have eight arms and live on the sea floor.

Oregon Silverspot Butterfly A brown and orange butterfly that lives in humid coastal salt-spray meadows and fields in the Pacific Northwest of the USA.

Oyster The oyster is a bivalve, a soft-bodied marine animal that is protected by two hard shells.

Painted Lady Butterfly A widespread and common butterfly.

Painted Lady Butterfly Life Cycle The life cycle of this common butterfly.

Plankton Plankton are tiny organisms that float in the seas and other bodies of water.

Pond Skater A bug that walks on water. It is also called the water strider.

Purple Sea Urchin A spiny, globular animal that lives on the ocean floor off the western coast of North America.

Queen Alexandra's Birdwing Butterfly Queen Alexandra's Birdwing is the biggest butterfly in the world. Its wingspan is about 1 foot (30 cm) wide.

Sand Dollar Sand Dollars are echinoderms, disk-shaped spiny-skinned sea bed animals that have 5-part radial symmetry.

Scallop Scallops are bivalves, shelled animals that live on the ocean floor.

Scorpion A venomous arachnid with a large stinger on its tail.

Sea Anemone Predatory animals that look like flowers and live on the ocean floor.

Sea Star Sea stars, another name for starfish, are animals that live on the ocean floor.

Sea Urchin A spiny, globular animal that lives on the ocean floor.

Shrimp Shrimp are small, bottom-dwelling crustaceans with a translucent exoskeleton.

Silkworm The silkworm moth is an insect (not a worm) that produces a silken cocoon. This cocoon is harvested to make silk thread.

Snail A soft-bodied animal with a hard, protective shell.

Spider Spiders are arachnids; they have eight legs.

Squid The squid is a fast-swimming invertebrate with ten arms.

Starfish Sea stars, another name for starfish, are animals that live on the ocean floor.

Tarantula A tarantula is a large, hairy spider.

Trilobite Trilobites are extinct marine arthropods that lived from about 540 to 245 million years ago.

Ulysses Butterfly The Ulysses is a spectacular swallowtail butterfly from Australia.

Uniramians Uniramians are a group that include insects, centipedes, millipedes, and their relatives.

Viceroy Butterfly The Viceroy is an orange and black butterfly from North America.

Vinegarroon A whip scorpion, an arachnid that emits a vinegar-like mist.

Walkingstick The Walkingstick (also called the laboratory stick insect) is a long, slow-moving, plant-eating insect that looks like a twig.

Wasp Wasps are insects with 2 pairs of wings and strong jaws. Many wasps sting.

Water Strider A bug that walks on water.

Whelk Whelks are marine invertebrates with a spiral shell.

Worm Worms are little animals with a long, soft body and no legs. Earthworms are worms that benefit the soil.

Yellow Jacket A yellow jacket is a type of social wasp, a flying, stinging insect.

Zebra Longwing Butterfly The Zebra Longwing is a small, black-and-yellow striped butterfly from warm areas.

Zebra Swallowtail Butterfly The Zebra Swallowtail butterfly is a common butterfly with distinctive black and white markings.

Zooplankton Zooplankton are tiny animals that float in the seas and other bodies of water.

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