We as humans are among the millions and billions of other living creatures on earth , all of these living creature share many common features despite the huge differences in shapes and sizes , Living creatures regardless to their sizes and shapes need food , air and water to sustain, they are able to reproduce directly or indirectly and adapt to the surrounding circumstances , living creature also are able to react to changes , grow and depend on themselves no matter what their shape or size is , our planet is a home for a huge variety of living creatures some of them are too small that can not be even seen by a naked eye and some are so huge ,However on this list we will mention to you the Top Ten Smallest Creatures On Earth By Size .
10- SEA URCHIN .
This creature lives at about 2000 meters deep in the oceans , they look round and have a shell , they can be found in many different colors such as blue , green , brown , olive and purple , about 950 different species of Urchins present in the ocean with varying shell sizes of 3 to 10 CM but the smallest species that was found had a shell of almost 6 mm and it is called Echinocyamus scaber which is our number 10 on the list .
Starfishes or also known as sea stars are easily found in all oceans all around the world at a depth of almost 6000 meters , they have five arms or sometimes more than five arms and they are shaped like a star , starfishes are found with different colors such as red , orange , brown or grey , they feed on particular prey , and have the ability to regenerate arms , Starfishes exist with varying sizes but the smallest that come as our 9th spot on the list is Patiriella Parvivipara.
8- SEA CUCUMBER.
Sea Cucumbers exist in all oceans around the world but mostly in the Asian Pacific Ocean , they have single or branched sex gland , they communicate with each other by sending hormonal signals and they have a body that feels like leather , they exist with various sizes but the smallest that was found is Psammothuria ganapatii with almost 4 mm length and it is out 8th spot on the list .
This creature live under insects and can adapt to almost any conditions except the coldness , they are able to feed on anything plants , flesh , insects anything , there are more than 40,000 species of this creature with varying sizes but the smallest and that come as the 7th spot on the list is Scydosella musawasensis with a 44 micrometer length .
This creature is a plant parasite that live on plants and can cause a serious damage to the plant tissue , they usually spread and reach to plants by the wind , they exist in different colors like pink , purple and yellow , more than 3.600 species of this creature was found so far with varying sizes of 125 to 250 micrometers .
5- CRUSTACEAN .
This tiny creature is a free living creature that can be aquatic or terrestrial or parasitic , they are considered an important member of the food chain and they are sometimes consumed by humans , there was about 67.000 species of Crustaceans found with varying sizes but the smallest that come as our 5th spot on the list is Stygotantulus stocki which is 94 micrometers long .
These creatures are enclosed with a membrane which can include different kinds of plants , animals or fungus , they exist with many varying sizes and shapes but the smallest that come as our 4th spot on the list is Prasinophytes with a 0.8 micrometer length .
This is a type of microbe that need high temperatures to survive and grow which is almost near to the boiling temperature of water , for this microbe to survive it need to live on the body of its hosting creature , they have a circular bodies with a protective layer , they are sized approximately 400 nm which is considered the 3rd smallest creature on earth .
2- MYCOPLASMA GENITALIUM .
this is a parasitical bacteria that is able to reproduce and grow , it cause genital diseases and can be transmitted between partners by unprotected sexual contact , it can be treated though by antibiotics , they are the second smallest creatures on earth with varying sizes of 200 to 300 NM.
NANOBES are much smaller than bacteria and considered as the smallest living creature on earth , scientists before were confused whether Nanobes are actually a living creature or not but it was evident that this creature contain DNA and they can reproduce , they are about 20 nanometer in size which make them the smallest creature on earth .