95% of People Can't Identify All of These Mollusks and Crustaceans. Can You?

By: Chelsea
Image: Shutterstock

About This Quiz

Do you live for all-you-can-eat crab and seafood? There's more than just oysters and mussels to the crustacean and mollusk families. Take this quiz to see how much you know about these sea critters!

With around 250 recognized species, these small creatures are frequently found in inland aquatic areas, rarely oceans.

The robber crab, formally known as the coconut crab, is a species of the terrestrial hermit crab and the only species of the genus Birgus.

Scientifically known as Haplotrema concavum, this large snail acquired its nickname due to cannibalistic behavior and glossy, flat shell.

The Asiatic clam, formally known as Corbicula fluminea, is easily recognized by its yellow-green shell with concentric rings.

Slug is the collective name used for terrestrial gastropod mollusks with no shells, a small internal shell, or a reduced shell.

Also known as procambium clarkia, this species of crayfish is indigenous to northern Mexico and the south and southeastern United States.

Found on the shores of sandy beaches, sand-hoppers are very small crustaceans that feed on rotting seaweed. They are close relatives of the shrimp.

Best known as being the producer of pearls, oysters, believed to be one of the oldest marine animals, inhabit the salt waters of temperate regions.

A popular delicacy, shrimp are semi-transparent, flexible decapods found worldwide in oceans and lakes.

Found on land and in water, crabs have thick exoskeletons and one pair of claws. They are only able to move sideways.

The term mussels is commonly used to refer to the members of bivalve mollusks. They include clams with oblong and asymmetrical shells found in freshwater and saltwater habitats.

Found in the sand of the ocean floor, clams are mollusks with perfectly symmetrical shells. They feed by filtering out nutrients from their water intake.

A pricey form of seafood, lobsters are large crustaceans with strong tails and three pairs of claws, the largest being the first pair. They are found on the ocean floor.

Inhabiting most of the world's oceans, scallops are small, clam-like crustaceans which spend most of their lives attached to substrates such as grass or rocks. Their shells are one of the most common found on seashores.

Found on the rocks of intertidal zones and native to the north-eastern shores of the Atlantic Ocean, the common periwinkle is an edible sea snail.

A class of mollusks, the term gastropods refers to snails (with shells into which they can retreat) and slugs. They inhabit the land, fresh water, and oceans.

Octopuses, characterized by their eight arms, are soft-bodied mollusks of the Octopoda order, which comprises of around 300 species.

This cephalopod, of which there are around 304 species, is part of the Teuthida order and is identified by its distinct head shape, bilateral symmetry, and eight arms.

Despite its name, this marine animal is not a fish but a mollusk and part of the order Sepiida.

Due to their wide distribution, these mollusks are able to survive in most temperatures and sea levels.

These extinct mollusks are recognized by the distinct spiral shape of their shells and are closely related to octopuses, squid, and cuttlefish.

Whelks is the general name given to a variety of sea snails, many of which are part of the Buccinidae family (true whelks).

Wentletraps, also called staircase shells and ladder shells, are known as such due to their intricate geometric shell architecture.

Gaper clams are a species of marine saltwater clams of the Tresus genus, which is also part of the Mactridae family.

These marine bivalve mollusks are noted for their rounded, bilateral symmetrical shells that are able to close completely.

Coquina clams, scientifically known as Donax, is a genus of small, edible saltwater clams, of which there are about 52 species.

Ten genera and over 200 species make up this family of saltwater clams, which comes in a variety of shapes and sizes.

This species of freshwater mussels owes its nickname to the striped patterns on its shell, which may not always be visible.

The Geoduck, a species of the Hiatellidae family, is noted for its long siphon and large shell, and as such is the largest burrowing clam in the world.

Quahogs are a species of the Mercenaria genus native to North America and Central America.

These saltwater clams are known as "termites of the sea" due to their tendency to bore into wood that has been immersed in water.

This name is commonly applied to a number of species of the Ensis, Siliqua, Solecurtus, and Solen genera.

Prawn is the collective name for small aquatic creatures of the Decapoda order that are characterized by their exoskeleton and ten legs.

This deep-ocean-dwelling squid is a member of the Architheuthidae family and can measure up to 13 feet in length.

Bubble shells is the general name used for over 600 species which are scientifically known as Cephalaspidea.

A sea hare has a soft body with an internal shell. These herbivores are also hermaphroditic and are typically found resting on seaweed in shallow waters. When feeling threatened or disturbed, the sea hare will release a toxic ink from its glands that is sometimes white, purple or red.

These are marine snails with a shell that has an open spiral layout. These edible mollusks are widely consumed, cooked or raw, by various cultures. The inner layer of the Abalones' shell has an iridescent color.

A conch has a noticeable spiral-shaped shell and comes in various sizes. The meaty inside of the conch is eaten raw or can be cooked. The shell of the conch is cut in the spire near the apex and can be used as a wind instrument.

The attack mechanism used by the cone shells to capture prey is a powerful sting. Cone shells prey on worms, mollusks, and small fish. Once the cone shell's prey is paralyzed by the venom from its sting, it extends a harpoon tip which allows it to draw the animal into its mouth.

Limpets have a conical disk-shaped shell and over 100 rows of teeth. However, these gastropods only utilize the ten outermost rows for feeding. These aquatic snails use their strong muscular foot to form a solid bond to rocks, making it difficult for predators to attack or pry them off.

Barnacles are closely related to crabs and lobsters and attach themselves to a hard surface permanently. These hermaphroditic creatures survive on a diet of plankton and detritus, which they draw in using their feather-like appendages.

Found in freshwaters, these crustaceans closely resemble tiny lobsters. Craw are widely known by other names, including crayfish, mudbugs, crawdads, and yabbies. Craw are consumed worldwide and can be boiled or put into soups.

Hermit Crabs hide their soft curved abdomens in scavenged mollusk shells. The most common shell used by hermit crabs are from sea snails. There are two types of hermit crabs -- marine hermit crabs, found in freshwater and saltwater, and land hermit crabs.

These small crustaceans are found at the bottom of the food chain and play a major role in converting plankton and zooplankton into a viable form that larger animals can consume. These filter-feeding creatures comb through waters to find food. They are the main prey of the baleen and blue whale.

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