Mollusca
Chordata
Echinodermata
Arthropoda
Cnidaria
100

Shelled gastropods found both on land and in the sea, coming in varieties such as cone, tower, and moon

What are snails?

100

Predatory fishes characterized by cartilaginous skeletons, a streamlined shape, and many, many rows of teeth

What are sharks?

100

Many-armed marine invertebrates known for their ability to regenerate lost limbs

What are sea stars?

100

These ten-limbed crustaceans have large claws, a carapace of chitin and calcium carbonate and long, muscular tails

What are lobsters?

100

These gelatinous swimming invertebrates possess stinging tentacles, no central nervous system, and a complex multi-stage life cycle

What are sea jellies?

200

Eight-armed, two-tentacled predatory cephalopods that swim with high-speed jet propulsion

What are squids?

200

Flightless, aquatic predators highly adapted for high-speed agile swimming, notable for their countershading

What are penguins?

200

Spiny, spherical marine invertebrates known for their lantern-like five-pointed mouths

What are sea urchins?

200

Teeny-tiny floating crustaceans that are an important food source for baleen whales

What are krill?

200

Named for a type of flower due to their appearance, these tentacled cnidarians make a great home for many species of clownfish

What are sea anemones?

300

Laterally compressed aquatic mollusks that live in a hinged shell

What are bivalves? (Clams, mussels, oysters, scallops, etc. acceptable)

300

Vulnerable marine reptiles whose hatchlings often have to make a perilous trek from the beach to the sea

What are sea turtles?

300

Flat, burrowing echinoderms known for their coin-like tests, which you've likely found washed up on the beach

What are sand dollars?

300

Sessile, filter-feeding crustaceans, you'd be forgiven for not knowing these animals found stuck to whales and ships are close relatives of crabs

What are barnacles?

300

Slow-growing and reef-forming, many of these diverse cnidarians get their array of colors from symbiotic algae called zooxanthellae

What are corals?

400

Colorful, often poisonous gastropods, whose flamboyant and striking appearance often lends them nicknames such as 'clowns' or 'dragons'

What are nudibranchs (sea slugs)?

400

Specialized arctic predators famed for a single elongated canine tooth in males

What are narwhals?

400

Soft, squishy invertebrates who scavenge for food in benthic marine sediments, some of whom can literally spill their guts as a defense mechanism

What are sea cucumbers?

400

Named for their shape, these ancient marine arthropods, despite their name, are more closely related to arachnids than to crustaceans

What are horseshoe crabs?

400

Gelatinous, often deadly, always excruciatingly painful, these cnidarians are named for the cubelike shape of their bells

What are box jellies?

500

Ancient, shelled cephalopods that emerged in the late Cambrian, with only one surviving family

What are nautiloids?

500

Large, slow-going, herbivores whose closest living relatives are the elephants

What are sirenians (manatees and dugongs?)

500

Looking more like plants than animals, these ancient echinoderms attach themselves to their substrate with a stalk and use feathery feeding arms to eat

What are crinoids (sea lilies)?

500

Found in an enormous variety of both sizes and environments, these crustaceans can be deep-sea giants or found in your backyard

What are isopods?

500

These cnidarians may look like one organism, but are actually communal superorganisms, some made of hundreds of small individuals, each specialized for different jobs

What are siphonophores?

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