The Oldest Animals Species Living on Earth

Oldest Animals Species Living on Earth

Earth, over its 4.5-billion-year history, has gone through five significant extinctions. You’ve most likely learned of at least one: The Crustaceous Extinction, the 5th and most recent (relatively) event, which wiped out more than half of life on earth, including the dinosaurs.

And yet, regardless of such biological tumult, some species have proven especially adept at weathering anything the world throws– not simply the Crustaceous Extinction (65 million years ago), but the Triassic Extinction (210 million) and the Permian Extinction (250 million), too. When digging down the history of Earth, we can see some animal forms handle to thrive upon the different geological time span of Earth, developed millions of years ago. Here you will read about a few of those animals.

1.Cyanobacteria– 2.8 billion years old

Cyanobacteria are the earliest known living system in the world. They originated 2.8 billion years ago and the first-ever microbe to produce oxygen through photosynthesis.


Because way they became a part of transforming Earth’s environment into an oxidizing one. Cyanobacteria are also known as green-blue bacteria. The unicellular cyanobacteria reproduce through micro fission.

2.Ctenophores (Comb Jellies) — 700 million years old

They possibly came 700 million years ago in the Cambrian period. Up until a few years back, sponges were believed to be the first animals on the evolutionary tree. However, a newer research study recommends that ctenophores (comb jellies) are the first real animals, not sponges.

Further Reading:  Most Beautiful Insects in the World


Researchers initially sequenced the genome of the earliest comb jelly, the sea walnut (Mnemiopsis leidyi), and compared it to several other types of comb jellies to figure out that they split from the animal kingdom’s common forefather prior to sponges.

3.Sponge– 580 million years old

Sponges are a unique kind of marine animal that looks like a plant. They appeared on world oceans 580 million years ago. There are 5000 various species of sponges in the world. They live in nests in different depths of the oceans. Sponges do not have any internal organs, arms, or head.


They have a special ability to restore the lost body part and the new sponge will grow from the old one. The body of sponges consists of many canals, ends up being a shelter for lots of little water animal species.

4.Jellyfish– 600 million years old

Jellyfish are the earliest multi-organ animal on the planet and have actually existed in some form for a minimum of 500 million years. The earliest recognized definitive jellyfish fossil dates back to 500 million years. Research on the fossil was released in 2007 and specifies that it is over 200 million years older than the previously oldest jellyfish fossils.

New research from around 2011, has actually exposed that jellyfish are more intricate than formerly believed. One marine biologist contested the conventional wisdom that jellyfish lack a central nervous system. He stated that the nerve system of jellyfish might not be as obvious as it is in animals with a brain connected to a spine, but it stands out in its own way.

Further Reading:  Carnivorous Plants- The Flesh Eaters
5.Nautilus– 500 million years old

Nautilus is a marine mollusk that came from 500 million years ago. That is long before Dinosaurs strolling in the world.


It is estimated that Nautilus is the only making it through a member of the big group of shellfish. Nautilus is discovered in the tropical water of Andaman, Fiji and the Great Barrier Reef, The live under the depth of 2200 feet of ocean. Nautilus also described as the living fossil.

6.Velour Worms– 500 million years old

Onychophora, typically known as velvet worms, are wormlike animals with a velour texture, hence the nickname. They are ancient animals carefully related to arthropods (such as millipedes and centipedes).


Unlike arthropods, velvet worms don’t have a hard exoskeleton and their silky skin is water repellent. In addition to their unique velvety texture, velvet worms are known for having lots of stubby feet– between 13 and 43 sets of feet– which all have a connected claw.

Fossil records of lobopodians going back to the Cambrian era bear a close similarity to modern terrestrial velvet worms. Since velvet worms have soft bodies that don’t fossilize well, it is not clear when their forefathers moved onto land. They may have made the shift about 490– 430 million years back.

7.Horseshoe Crab– 445 million years old

Horseshoe crabs came into the world 445 million years. They live in shallow ocean waters across the world. Horseshoe crabs have a hard exoskeleton, long tail, and spinal columns.


They have 9 eyes in total, found throughout the body. Out of nine two large eyes are primarily used by horseshoe crabs and others are light receptors to control the motions. They likewise can notice extremely violet rays.

8.Coelacanth– 360 million years old

Up until a live specimen was discovered in 1938, the coelacanth was thought to have actually gone extinct about 65 million years ago, in addition to the dinosaurs. Coelacanths have lots of distinct attributes, including their 4 fins that extend far from their body like legs.

Further Reading:  The Most Venomous Spiders on the Planet


These fins also move in a rotating pattern, similar to other four-legged animals, such as a trotting horse. They also have a joint in their skulls which lets them open their mouths large enough to fit bigger prey; and thick scales that do not exist in any other known living fish.

9.Horseshoe Shrimp– 200 million years old

Horseshoe Shrimps were evolved in the world at the same time as that Dinosaurs develop, around 200 million years earlier.


Horseshoe shrimp are tiny (2 to 4 millimeters in length). The ability to make it through in any condition of weather and geological variations is the main quality of Horseshoe Shrimps. Scientists found this amazing marine species in 1955. The scientists likewise succeed to discover the growth of horseshoe shrimp by re-wetting the eggs which have a number of years of age.

10.Martialis Heureka-120 million years old

Martialis is the earliest ant species discovered from the Amazon tropical rain forest. The word Martialis huereka indicates ‘ants from Mars,’ because this species has different habits than other recorded ant species on earth. It is estimated that this specific type of ant species was evolved on Earth 120 million years ago. The discovery of Martialis Huereka helps the biologist to make in-depth study about other ant species.