As of today, allow me to unveil to you unevolved creatures (Living Fossils), and plants with unchanged and mysterious evolution characteristics. For one thing, these 12 mysterious creatures (Living Fossils) still exist today. More or less unevolved from the forms they had hundreds of millions of years ago.
By definition, a fossil is the naturally preserved remains or traces of animals or plants that lived in the geologic past. Notably, some fossils preserve original features in exquisite detail, while others are much cruder remnants.
In general, fossils provide us with information about the shapes, sizes, and appearances of organisms that lived in a given time period. They can also provide us with information on how the organisms used to roam the land or bodies of water.
As well as other characteristics of their lifestyles, like how they nursed their young.
READ MORE: About The Evolution of Fossils
What are Fossils?
Which are some Examples of Living Fossils?
1. Ginkgo Biloba
While the fossil form of the ginkgo tree is identified by a different scientific name than the modern Ginkgo biloba, most researchers studying the tree consider them to be identical. If that weren’t enough to qualify the tree as a living fossil, consider that it is not just the only surviving member.
Especially, of its genus, family, and order, but that it is unique through to its phylum classification. Having such a lone spot on a taxonomy makes identifying the tree’s relatives especially difficult. On top of that, the ginkgo may be functionally extinct in the wild.
While it is widely cultivated around the world (and can be found lining the streets of many American cities) it’s only known by wild populations in China. In fact, very old stands planted and tended to for many hundreds of years by Chinese monks.
2. Frilled Shark
In the first place, the frilled shark made headlines in early 2007 when a living specimen surfaced off the coast of Japan. Secondly, it was assumed the fish was sick because it otherwise would have been loath to leave its natural habitat at depths approaching 3,000 feet.
It died after only a few hours, having been transferred to a nearby marine park, but the brief time it was observed alive was exceptionally valuable to researchers because it is such a rare being. The frilled shark is perhaps the most primitive shark known to exist. It looks very unlike a shark, with an eel-like body and proportionally small fins.
Teeth in the fossil record have shown the modern frilled shark to be strikingly similar to its forebears. That’s again the result of living in an environment with little changing competition. It has had no need to evolve over the past 100 million years and so has largely remained the same.
READ MORE: About Coelacanths
The recent decoding of the platypus‘s genome confirms what we already knew: the platypus is one of the strangest creatures on Earth. It’s technically a mammal because it is covered in fur and produces milk. But, it comes up short on the requirement that its young be born live (it is one of two mammals which lays eggs).
It’s also a part bird, having a sophisticated duck-like bill capable of electrosensory, underwater food detection, and part reptile. Equally, the male has a spur on its hind legs that delivers a potent venom. Quite possibly one of the earliest offshoots of the mammalian line.
Having diverged from reptiles 166 million years ago, the platypus lives as an important marker in the study of evolutionary biology.
READ MORE: 10 Curious Facts About the Platypus
4. Vampire Squid
Just as the horseshoe crab is not actually a crab, the vampire squid is not a squid. But, a distant cousin descended from a cephalopod no longer with us, so that it occupies its own taxonomic order. And as the fossil record for coelacanths is spotty because of their deep habitat, so too is the record for the vampire squid.
After all, which makes it home at nearly 3,000 feet under the sea, a depth at which the concentration of oxygen hovers around 3 percent, the absolute limit for aerobic metabolism. Unlike squids and octopuses, it has no ink sac. But rather, the ability to eject a bioluminescent mucus meant to distract predators in the near-absolute darkness of its habitat.
Because it lives at such extreme depths, it has evolved to survive through the least possible expenditure of energies. Whereas an octopus would ink a predator and jet away quickly, the vampire squid prefers to slink off just out of view.
5. Virginia Opossum
The only marsupial in North America, the opossum as we know it is, in fact, one of the most recent marsupials to evolve. Above all, which would seem to disqualify it from this list. But, as far as the living-fossil moniker is concerned, the opossum can be included under its umbrella.
Simply, because it has retained many of the features of the earliest known marsupials and so bears a close relation. What is most curious about the animal—and is the source of the phrase “playing possum”—is its involuntary reaction. Especially, when it’s threatened to a significant degree.
The animal literally forces itself to the edge of a coma from which it is unable to awake for hours. Meanwhile, emitting a foul smell to discourage predators hunting for live prey.
The fossil record for the Nautiloidea (Nautilus) subclass is rich with a diversity of shell shapes and forms. To date, nearly 2500 species have been identified as having once flourished. Today, the only surviving members of the family are the six modern species of nautilus. Then again, which together have remained nearly unchanged since they first appeared.
And while they lack many of the more advanced traits found in modern cephalopods, they have recently been discovered to have the capability for long-term memory. Despite never having evolved the necessary brain structures.
How it is that the animal developed similar neural pathways to the cephalopods’ without the same brain physiology is a mystery still to be solved. Researchers studying the puzzle hope the nautilus will answer other questions. In particular, about how the more sophisticated modern cephalopod brains came to be.
Alligators and crocodiles are perhaps the most obvious candidates for a family tree with short branches leading back to the long-dead. They are birds’ nearest living relatives, who are the most direct descendants of dinosaurs.
While their basic body shape has stayed virtually unchanged over millions of years, their skulls and vertebrae have evolved. Making them stronger and more agile in their present-day form. Today, there are 23 species of alligators and crocodiles.
So, they can hardly be held to a strict interpretation of the living fossil ideal. They are instead included because they are the only reptilian survivors of the Archosauria group. Not forgetting, home to the dinosaurs.
READ MORE: Crocodile 5 Simplified Facts You Should Know
Before the close of this century, the tuatara may lose the first half of its topical designation and become, simply, a fossil. Climate change will be responsible for raising the soil temperature in its remaining island habitats around New Zealand to the point at which female hatchlings cannot survive.
After the introduction of rats to the mainland by early explorers, the tuatara’s population was set on a course toward extinction. Now its only remaining members there are in a fenced wildlife sanctuary. This cousin of both lizards and snakes is the only remaining member of an order of reptiles stretching back 200 million years.
It is perhaps most curiously known for the third eye set on top of its skull. Obviously, the exact function of which is largely speculative. While it is connected to the brain by a dedicated nerve, the parietal eye is covered with scales. And is hidden from view soon after birth, leading some to believe it is responsible for maintaining circadian rhythms.
The coelacanth is the most famous and widely recognized species of “living fossil.” Both because it was discovered in 1938 after having been thought to have been long extinct. And also, because it is one of the earliest relatives of the fleshy-finned fish. Ultimately, which evolved to become the first land-dwelling vertebrates.
Somewhere between the coelacanth and us is the fabled missing link which dragged itself out of the ocean to walk on land. Unlike lampreys and horseshoe crabs, early coelacanths are notably different. Particularly, from the few specimens found by fishermen in recent years.
However, their exact lineage is difficult to map because of the relative scarcity of deepwater living fossils.
The okapi is a solitary animal that exclusively populates the rainforests of the Congo. At first glance, it looks to be a cross between a zebra and a donkey. But it’s presently categorized as the closest living relative of the giraffe. While its body structure, apart from its short neck, appears to bear this out.
As a matter of fact, chromosomal data has shown that it may, in fact, be more closely related to an antelope native to India. Here, then, is an example of an animal with no good fossil record (the giraffe is equally sparse). And of course, which has assumed the role of “living fossil” largely. Simply, because of the information necessary to prove the case otherwise does not exist.
It has, however, evolved one trait in common with the giraffe—a tremendously long and flexible tongue. Not forgetting, another important point, it’s one of the few mammals with the ability to lick its own ears.
11. Horseshoe Crab
Not to be outdone by the lamprey, the horseshoe crab is a marine creature which may have had an even longer stretch of non-adaptive time in the ocean. While undoubtedly less “primitive” than the lamprey, having compound eyes and limbs. Nonetheless, it has followed a similar path in that it evolved 445 million years ago. Basically, the same point at which we see it today.
It has no close relatives—many hundreds of millions of years-long branch on the evolutionary tree will do that to you. But, is more connected to spiders and scorpions in its distant past than it is to crabs.
While the animal is by no means endangered, its populations have been in decline since the 1970s. And thereby, conservation efforts are at work along the Atlantic coast to stave off that eventuality.
12. Sea Lamprey
Just two years ago, a Sea Lamprey fossil was discovered, which extended the animal’s reach back through 360 million years on Earth. What is most impressive about the Lamprey—and perhaps most fitting, as it is certainly the most primitive vertebrate we know of. So to say, it managed to specialize very early on in its existence.
Specializing so well that it needed very few adaptations through the four major extinction events it has so far survived. It is one of only two vertebrates to remain jawless; it never evolved fins, scales, true teeth, or limbs.
And while today’s lampreys are slightly longer than those from hundreds of millions of years ago. Again, they are very much alike in almost every other respect.
I hope you loved reading, learning and understanding more about the Charles Darwin theory of Living Fossils. However, if you’ll have more additions, contributions, suggestions or even questions, please let us know how we could help! Therefore, Contact Us or even leave your queries in the comments box below this post.
You must log in to post a comment.