My Deep-sea Fishery

But this Nautilus does not.

Its shell is a round plate, which is exactly the same as the chrysanthemum, but it is much smaller than the ordinary chrysanthemum, and it is a bit like a miniature chrysanthemum.

Xiang Yang felt a little suspicious in his heart, "Could it be an atavism phenomenon?"

Xiang Yang doesn't believe in anything, this is a real chrysanthemum fossil, because it's impossible.

Ammonites have been extinct quite early, and it is impossible for them to exist alive. Modern humans simply cannot see them with their own eyes.

Xiang Yang thought about it carefully, and it is said that there is a species of nautilus that looks very similar to the chrysanthemum fossil.

This kind of nautilus itself evolved from ammonites. Although the two creatures have developed for tens of millions of years after evolution, the appearance of the two creatures is very similar, and the fossils of the two creatures are even placed Together, many cannot tell.

It's just that the number of this kind of nautilus is extremely rare, and many people have only heard of it, but have never seen it.

Xiang Yang guessed that this nautilus should be the legendary nautilus.

At this time, the little nautilus poked its head out of its shell, and carefully explored the surrounding area. When it saw Xiang Yang standing in front of it, it immediately retracted its head, and then lay straight on the ground to start Play dead.

Xiang Yang smiled heartily, thinking that most of the sea creatures have become stronger and stronger after endless years of evolution.

But this nautilus is becoming weaker and weaker as it evolves.

Even today, they no longer have the means of attack at all, and they can only lie on the ground and pretend to be dead when they are in danger.

Back in ancient times, the Nautilus family had a glorious past.

Not to mention the straight-shelled nautilus that once dominated the ocean.

As for the ammonite fossil, as far as Xiang Yang knows, an ammonite fossil of an unidentified species with a diameter of more than 2.3 meters has been found in Colombia.

Once the ammonite fossil is confirmed, it will be the largest ammonite fossil known so far.

These ammonite fossils are not only for viewing in the eyes of scholars. Because the ammonites have existed for a long period of time and are widely distributed in the sea, megaliths are the most useful for geologists to estimate the age of rocks. Fossils, so scholars can easily deduce the age of rocks only by analyzing ammonites.

Of course, nautilus is always the most valuable conch, more valuable than chrysanthemum fossils.

Because nautilus fossils are very rare, the price is very high, and many fossil players even use ammonite fossils to fake nautilus fossils to sell.

Of course, this kind of deception cannot deceive those professional people.

Although Xiang Yang is not a professional, he also knows several ways to distinguish chrysanthemum fossils from nautilus shells.

Among them, the simplest identification method that Xiang Yang knows is that the most obvious difference between chrysanthemum fossils and nautilus is the difference in shell seams and textures.

Even if it is complex and has multiple folds, the nautilus is a simple curve. If it is the kind of half-dissected fossil, you only need to remember that the next door of the ammonite bends outward, and the nautilus is inward. Just remember These two identification methods will basically not be deceived.

Xiang Yang flicked the little nautilus, which was pretending to be dead, with his fingers. Speaking of which, the nautilus has a relationship with humans. There are many air chambers in this creature. When the nautilus is about to sink in the sea, it will Fill the air chamber with water to add weight.

The ascent, however, is the opposite, inflating the chamber to save weight.

Human beings used the diving principle of this creature to invent the first nuclear-powered submarine, the Nautilus.

The difference between the modern and prehistoric creatures of the nautilus is really very big.

The current body length of nautilus is generally no more than 20 centimeters, but in prehistoric times, nautilus, like ammonites, had a variety of shapes in prehistoric times.

Among them, the straight-shell nautilus that Xiang Yang once discovered can grow to a length of 12.5 meters.

That kind of body was a very huge creature even at that time, and the huge shell of the straight-shelled nautilus is not just a fancy but useless.

In fact, they are very strong, dozens of times stronger than the shell of a conch today.

If this nautilus, its ancestor, the straight-shelled nautilus, was hit by someone like this, it might turn around and rise up to attack Xiang Yang.

But today, the Nautilus has obviously completely lost its ability to attack. When Xiang Yang flicked it, it just tightened its shell and continued to play dead.

Xiang Yang sighed suddenly, thinking back to ancient times, in the prehistoric ocean at that time, most creatures could not bite through the shell of the straight-shelled nautilus. For this reason, this creature once dominated the ocean in the Ordovician period. , and even the prehistoric trilobites at that time, in order to avoid being eaten to extinction by this giant creature, also evolved long and hard needles to resist the hunting of the straight-shelled nautilus, which shows how powerful the ancestor of the nautilus is.

On the other hand, the current nautilus is not big, and it is not at the top of the food chain. Coupled with the massive hunting and killing of humans, it is even facing the danger of extinction. It is really not as good as it used to be.

Xiang Yang teased the nautilus for a while, but the nautilus kept its head tight, gradually Xiang Yang also lost interest in it.

"Forget it, I won't scare you." Xiang Yang stood up and continued to look at other sea creatures around him.

A giant-sized sea cucumber and a nearly extinct living nautilus were found in this sea area one after another. Xiang Yang's interest in this sea area is getting bigger and bigger now.

Although Xiang Yang couldn't catch the nautilus because of the protection of animals, after this trip, Xiang Yang was not without gains, because he found a sea area that seemed to be rich in rare fish.

After Xiang Yang got up, the nautilus poked its head out cautiously, and then slowly crawled forward for a while.

Seeing that Xiang Yang didn't pay attention to it, the nautilus immediately became happy. It swung its body quickly, then floated in the sea water and swam away quickly.

Of course Xiang Yang saw the nautilus running away, but he couldn't catch it, and approaching would scare the nautilus, so Xiang Yang didn't pay attention to the fleeing nautilus.

This seabed is a vast expanse of whiteness. Most of the fishes, snails and shells that live in this sea area are also white, so even Xiang Yang has excellent eyesight. It is difficult to find any valuable seafood in the vast expanse of whiteness.

This feeling is like looking for a little white rabbit in the ice and snow. Even if it is lying in front of people, it is difficult to find it if you don't look carefully.

Of course, Xiang Yang is not in a hurry, he has already harvested a lot from this trip, and he is not in a hurry to catch more valuable seafood, he has plenty of time to look for it slowly.