A-z - Animals


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oyster 1

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Oysters consist of a large number of saltwater bivalve molluscs.

Oysters are marine animals that usually live in saltwater habitats. They are very irregular in shape and some valves are highly calcified. They belong to the phylum Mollusca.

Oysters are animals that feed on algae and other food particles that are usually attracted to their gills. They are known to reproduce by broadcasting spawning in warmer waters and are also able to change sex. Each oyster is capable of producing at least one pearl during its life cycle.

Incredible Oyster Facts!

Animals with Exoskeletons - Oysters
Humans have been eating and farming oysters for thousands of years.

© wasanajai/Shutterstock.com

  • CAN FILTER WATER: These sea animals can filter up to 1.3 gallons of water per hour.
  • Ancient Creatures : Oysters have been eaten and eaten by humans for thousands of years.
  • Too many eyes : Oysters are full-bodied animals. These eyes help them escape from predators.
  • Shell Concealment : These creatures have been known to hide in their shells when they sense danger. The shells then close tightly to protect them.
  • No Central Nervous System : These animals do not have a central nervous system. Therefore, they cannot feel pain like humans.

You can check out more incredible facts about oysters.

evolution and origin

According to zoologists, the first oyster species arose more than 200 million years ago during the Triassic era, when dinosaurs prevailed on Earth. Based on fossil evidence, oysters date back to about 145 million years ago. It can be deduced from this that oysters have existed since the beginning of human civilization.

Researchers may have discovered the earliest individual to eat shellfish. While digging a cave in South Africa, scientists have found signs of shellfish dating back 164,000 years.

In addition, to be able to reproduce, oysters produce larvae, which float for two to three weeks. During this time, large numbers of them are eaten by small predators or die from other causes, while those that survive settle on the surface.

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They are best off anchoring themselves on a mature oyster reef where they will spend the rest of their lives. Once attached to any surface, the larvae are called "eggs".

Different types

  • Oyster
  • Chilean Oysters
  • Akoya pearl oyster
  • Oriental Oysters
  • Windowpane Oysters
  • Big pearl oyster
  • mother-of-pearl
  • Glomerola
  • Oyster
  • Bamboo
  • Oyster
  • Oyster
  • Sumie Oysters
  • Portuguese oysters
  • Oyster
  • White Pearl Oyster
  • Echinacea
  • Sanming wood
  • Oyster
  • Black mother-of-pearl
  • swordfish
  • Osmanthus leaves
  • Squamovertebrae
  • daffodils
  • trifoliate fern
  • Oyster
  • Caterpillar

taxonomic name


© Anthere/Creative Commons

The scientific name of these animals is Ostreidae and they belong to the subclasses Bivalvia and Pteroptera. They belong to the kingdom Animalia and the phylum Mollusca.

The scientific name Ostreidae is a combination of two words – Ostrea and the suffix -idae. This suffix is fairly common among sea creatures and comes from the ancient Greek word eîdos, meaning "look" or "likeness." In this case, the suffix refers to the Latin word for oyster ("Ostrea").

Ostrea can be traced back to the ancient Greek word "ὀστέον", meaning "bone". The name may be a reference to the distinctively shaped shell.


There are about 200 species of oysters worldwide. Oysters form a large family of bivalve molluscs. In the United States, only five species are typically sold to consumers as food. These species include Pacific oysters, Atlantic oysters, Kumamoto oysters, Olympia oysters and European oysters.

Many species can change their sex at some point. While some people may only switch genders once or twice, the process can be repeated many times.


Many oysters have irregular shapes with oval and/or pear-shaped shells. The shell is usually off-white, and the inside of the shell is usually white.

These animals are known to have very strong adductor muscles that help them close their shells when they sense danger hiding inside. They are usually 62 to 64mm long and a medium sized oyster usually weighs around 50g.

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Open oysters at a market in Lyon
Open oysters at a market in Lyon

©Chris 73/Wikimedia Commons/Creative Commons

Distribution, Population and Habitat

These sea creatures are commonly found in brackish waters off the coast of the United States. They are usually found in clusters and are often found on shells, rocks or any other hard surface.

These clusters often fuse together, eventually forming rocky reefs that eventually also serve as habitats for many other marine animals.
Their total global population is unknown. However, bivalve molluscs are abundant in water bodies around the world and these marine organisms are not yet threatened or endangered.

predator and prey

Oysters and Mussels
They may not have brains, but the oyster's ability to make pearls is remarkable.

©Pix Box/Shutterstock.com

Like almost every other living animal, they are an integral part of the environmental food chain and are eaten by other organisms. Key predators of oysters include crabs, starfish, humans and seabirds due to their high supply of protein and other nutrients.

Not all predators hunt these creatures for their meat. Boring sponges, for example, seep into their shells to kill animals and take them over as their homes. Oyster flatworms (also known as oyster leeches) chase small oysters as they feed, diving into their shells. After the flatworm has eaten the meat, it uses the shell to protect the eggs.

At the same time, these sea creatures are not known to feed on other animals, and have been known to often eat algae and other food particles as water rushes over them.

Reproduction and Lifespan

These animals are known to reproduce by broadcast spawning, which means that females and males release their eggs and sperm into warm waters, which is where they hatch. The gestation period lasts about 7 to 10 days before the live oysters are released.

In captivity, these animals have a typical lifespan of 20 years but require proper care. They are not currently considered an endangered species, but much of the impact on their lifespan in the wild has to do with fishing these animals.

fishing and cooking

Oysters are easy to catch and cook. In fact, they are widely eaten all over the world. However, they can make you sick if not cooked properly. Cooking them kills unwanted bacteria and also eliminates the risk of infection. When properly prepared, these animals can provide an excellent source of protein and vitamins.

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Distinguishing between species is crucial because they all have different flavors and methods of preparation. Eastern U.S. oysters, for example, are much saltier than Pacific oysters, but the latter have a saltier flavor for complex palates.

Oysters are a very flexible dish as they can be steamed, pan-fried, boiled, smoked, fried or prepared in almost any way. They can even be baked. Best of all, their flavor can make them a great aphrodisiac for a romantic dinner for two.

Some vegetarians also choose to eat oysters. Although oysters are living things, they do not have a central nervous system. Without these nerve endings, they cannot feel pain and cannot move.

See all 65 animals that start with O

Oysters are found primarily in brackish and brackish waters off the coast of the United States.

Yes, these sea creatures have eyes all over their bodies that allow them to escape predators.

Yes, you can have oysters. However, if not cooked properly, they can make you sick.

Seabirds, starfish, humans and crabs are the main predators of oysters.

Oysters feed on algae and other food particles that are attracted to their gills.

Yes, each oyster is capable of producing at least one pearl.

Oysters belong to the animal kingdom.

Oysters belong to the bivalve class.

Oysters belong to the phylum Molluscs.

Oysters belong to the Oyster family.

Oysters belong to the order Ostreoida.

Oysters are covered in shells.

The average number of babies in an oyster is 1,000,000.

The scientific name of oysters is Oysteraceae.

Oysters have shells.

There are 200 kinds of oysters.

The biggest threats to oysters are crabs, seabirds, humans and starfish.

The population of oysters is unknown.

Oysters spawn.

There are many differences between oysters and mussels, including their size. Oysters are larger than mussels and have much thicker shells. Mussels are also found in saltwater and freshwater, while oysters only live in saltwater.