12 Sea Animals With Shells (+Pictures)

Sea animals come in all shapes and sizes. Some are big, some are small, some are even tiny.

What sea animal has a shell?

Sea creatures are amazing. They live in water, breathe air, eat food, and move around. Many species have shells or other protective structures. These include clams, crabs, snails, starfish, octopuses, jellyfish, and turtles.

Sea Animals With Shells : 

Sand dollar

What is a sand dollar? What does it look like? How big is it? And why should I care?

A sand dollar is a type of sea urchin found along the coastlines of Australia and New Zealand. They are also known as “sea biscuits” or “sea eggs” because they resemble little pillows. Sand dollars are often mistaken for mussels, but they are actually marine invertebrates.

The average size of a sand dollar is only about 2 cm (0.8 inches) across.  In addition to being a delicacy, these animals are also highly sought after by collectors. Their value has increased over time due to their rarity and beauty.

chambered nautilus

What is a chambered nautilus? This shellfish has become a symbol of New Zealand. The natural habitat of these creatures is found in deep water. They live in colonies and feed off of tiny crustaceans called krill.

Chambered Nautiluses are large marine animals that belong to the mollusk family. These sea snails are often seen swimming near the surface of the ocean. 

Their shells are unique because they contain chambers inside them.The chambers are filled with gas and air pockets. The gas helps the animal control its buoyancy. The nautilus also uses its shell to create a hydrostatic skeleton.

Chambered Nautsiluses are large marine animals that look similar to giant squid. Their shells are composed of calcium carbonate and are usually between 30 and 50 centimeters long.


Turtles are known for their ability to live in extreme conditions. They can survive in water temperatures ranging from -4°C to 50°C. The turtle shell is a unique feature that protects them from predators and other dangers. 

This shell also helps regulate body temperature. A turtle’s shell consists of two layers of calcium carbonate plates. These plates are secreted by special cells called osteoblasts. When they come together, they form a solid structure.

Turtles are amazing creatures. They can survive in water for over 100 years and they even have shells. They are reptiles that belong to the order Testudines (meaning “hard skin”). There are two main groups of turtles: sea turtles and land turtles. Sea turtles spend their whole lives at sea, whereas land turtles spend most of their life on land.

There are several reasons why turtles can live for such a long time. First, they don’t eat much food. Second, they have a slow metabolism. Third, their bodies produce less waste. And fourth, they don’t age as quickly as other animals.


Do you ever wonder why tortoise shells are so expensive? Well, they are very rare and only found in certain areas of the world. The price of these beautiful shells varies from $1,000 to over $2000. What makes them so valuable?

Tortoise shells are considered a symbol of good luck and wealth. They are also believed to bring protection and longevity. In Chinese culture, tortoise shells are associated with the element wood.

They are highly sought after because of their rarity and beauty. There are even websites where you can purchase tortoise shells for a fraction of the cost.

The lifespan of a tortoise depends on its species. Some live up to 100 years, while others only reach 50 or 60 years old. For example, the Aldabra giant tortoise lives for over 150 years.


Bivalves are mollusks (mammals), such as clams, oysters, mussels, scallops, etc. They are also known as bivalve molluscs or shellfish.

Bivalves are characterized by having two shells, each containing a single opening called a siphon. This type of animal has a soft body covered by a thin skin.

They live in both saltwater and freshwater environments. There are over 2,500 species of bivalves around the world. Some of them are edible, some are used for food production, and some are used for human consumption.

roman snail

The roman snail (Helix pomatia) is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Helicidae. This species is native to Europe, Asia, North Africa, and parts of northern Africa.

This snail is also known as the garden snail or common house snail. They are often found in gardens and they eat slugs and snails. They have a long life span and reproduce every year.

Read More : Animals That Live In Water !

Sea Urchins

Sea urchins are a type of echinoderm (a group of animals related to sea stars, crinoids, and brittle stars). They are found worldwide in shallow coastal waters. The spines on their bodies are called tube feet. These creatures are known for their ability to regenerate themselves after being cut into pieces.

Sea urchins belong to the phylum Echinodermata, class Asteroidea, order Spatangoida, family Strongylocentrotidae, genus Diadema. They are also known as sand dollars or sea biscuits.

They  are often confused with starfish because they look similar. While both are edible, sea urchins contain toxins that can cause severe allergic reactions.

Sea urchin roe contains high amounts of heavy metals such as mercury and cadmium. These toxins can cause serious health problems, especially for pregnant women or children. Although sea urchins are delicious, they also pose a danger to human health. They contain high levels of toxins, and some species are known to carry diseases.

longhorn cowfish

The longhorn cowfish (Dolichopteryx longipes) is a species of fish native to Australia. They live in rivers, lakes, and estuaries, where they feed on algae and detritus. This species has a unique lifestyle, spending its entire life cycle in freshwater.

While some people may view the longhorn cowfish as a nuisance, these fish play an important role in maintaining water quality. Their presence helps prevent the growth of harmful algal blooms and reduces nutrient pollution.

This fish has a unique appearance because its body is covered with large spines. These spines are called tubercles. They are located on the head, back, sides, fins, and tail.

king crab

King crabs are some of the largest crustaceans in the world. They can weigh over 100 pounds and live for over 30 years. How did they get such big sizes? What makes them so special?

King crabs are found worldwide in tropical waters. The species that lives in Japan is called the Japanese king crab (also known as the giant king crab). This species has become famous because of its large size.

King crab is one of the most expensive seafood items around the globe. How much does it cost? The meat of these crabs has a sweet taste and is considered a delicacy.

King crab is sold fresh and frozen. Fresh king crabs are usually caught within 24 hours of being harvested. Frozen king crabs are often kept frozen for several months before they are shipped out.

pond slider

A pond slider lays about 100 eggs per year. This means that each egg has a 50% chance of hatching into a baby pond slider. If all the eggs hatch, then you should be able to raise about 500 baby pond sliders.

Yes, they do! Pond sliders are carnivorous reptiles that feed primarily on fish and frogs. They also eat small invertebrates such as insects and worms. They are found throughout North America, Europe, Asia, and Australia.

Do pond slider turtles have shells? Yes, they do! However, turtles don’t need shells because they live in water. They use their tails for swimming and their claws for digging up food.


What is a cockle animal?

Cockles are molluscs (shellfish) found along the coastlines of the UK and Ireland. They are also known as sea slugs or sea snails. The name cockle comes from their shell shape, which resembles a cockerel’s head.

Cockles are usually eaten raw, boiled, steamed or fried. They are very nutritious and contain high levels of protein, calcium and iron.

Cockles are a type of shellfish found along the coastlines of Britain and Ireland. They are also known as sea biscuits or whelks. Cockles are delicious and nutritious, but they can be tricky to cook. What does cockle mean?

Cockles are usually eaten with vinegar and butter, or sometimes with lemon juice. The shells are removed before cooking, and then the meat is cleaned and cooked.

radiated tortoise

Radiated tortoises are reptiles that live in Australia. They are also known as the “world’s longest living reptile”.

Radiated tortoises live for up to 40 years, and they are found only in Madagascar. They are also known as “Madagascan giant tortoises” because they grow to be about 2 meters long. The largest species of tortoise is the Aldabra giant tortoise, which grows to be about 4 meters long.

They can survive without water or food for several months. Their lifespan depends on their age, gender, health condition, and environmental conditions.