My Deep-sea Fishery

Everyone stared blankly at Xiang Yang.

Fang Youqun even teased directly: "Brother Yang, have you watched too many sci-fi movies? A conch several meters long? How could there be such a big conch in this world."

The other crew members were not as "upright" as Fang Youqun, but they were all whispering.

Even Chen Qingsheng twitched at the corner of his mouth, apparently not believing what Xiang Yang said.

No wonder people don't believe it.

Among the people present, which one didn't often see things like conch?

Because of the frequent contact, everyone is familiar with the creature conch, so everyone thinks that it is impossible for the conch to grow so big.

No.

Not everyone feels the same way.

"A conch several meters long..." An old scientific researcher murmured a few words in a low voice, his face suddenly changed, and he looked at Professor Chen Yu in surprise and said, "President Chen, I know a kind of conch, very It fits the kind of conch that Comrade Xiang Yang said."

Chen Yu's voice trembled, "Coincidentally, I also know a kind of conch, which looks very similar to the conch that Xiang Yang mentioned."

"What kind of conch are you thinking of?" The two said in unison.

Professor Chen Yu stared at the old researcher.

one second.

two seconds.

three seconds.

Suddenly, the two gasped in unison.

"Hiss, straight-shelled nautilus!"

"Is it really a straight-shelled nautilus?" Professor Chen Yu looked at Xiang Yang, his voice trembling with excitement.

"Straight-shelled nautilus?" Xiang Yang pretended to be puzzled.

The rest of the people also pricked up their ears and listened attentively.

Everyone knows Nautilus.

The scientific name of Nautilus is Nautiloidea, which is a general term for marine molluscs of Cephalopoda and Nautilus.

There are 2 genera and 6 species of nautilus.

As one of the four famous snails, the Nautilus is really famous.

Almost everyone on board knows that the nautilus has a curly pearl-like shell, and the largest shell is only 26.8 cm, but the adult nautilus generally does not exceed 20 cm. How many meters is the nautilus? You know it's fake.

In fact, the real name of the nautilus known to everyone is the nautilus nautilus.

The big navel is Nautilus. Although the name has big characters, it is not big at all.

Not only is it not big, the nautilus is actually the smallest genus in the entire Nautilus family, generally only 16 cm.

The shell of the umbilical nautilus consists of many chambers, the mantle is located inside the shell, and the chambers are separated by diaphragms.

The living Nautilus nautilus has two pairs of gills and 63-94 arms. Its shape is somewhat similar to that of an octopus with a shell on its back, but it has no suckers and more tentacles.

All nautiluses have simple eyes, except for the straight-shelled nautilus, which is indeterminate.

Some nautilus eyes don't even have lenses.

Most of the nautilus shells are thin and light, coiled in a spiral shape, the surface of the shell is white or milky white, and the growth lines radiate from the navel of the shell, smooth and dense, mostly reddish brown. The entire spiral shell is as smooth as a disc, shaped like a parrot's beak, hence the name "Nautilus".

Because of the thinness of the shell, very few shells survive the death of a nautilus, so its price is generally very expensive.

The nautilus is basically a benthic animal, and usually crawls slowly with its wrists at the bottom of 100 meters deep water. It can also use the secretions of the wrist to attach to rocks or coral reefs. Most scientists believe that nautilus cannot swim, but many diving enthusiasts have photographed nautilus swimming on the seabed Image, they can suspend themselves in the sea water, flickering, floating forward like a hot air balloon.

Nautiluses are well-known nocturnal creatures. They are usually more active at night than during the day. Most nautilus forage for food at night, and rest on the ocean bottom during the day, holding on to the bottom rocks with their tentacles.

It is worth mentioning that there are traces of nautilus from the surface of the ocean to the deep sea of ​​thousands of meters. Nautilus can adapt to the pressure of different depths.

All nautiluses are carnivores, and their food is mainly small fish, molluscs, and benthic crustaceans, especially small crabs, which are the main food of nautiluses.

The nautilus has undergone hundreds of millions of years of evolution on the earth, but its appearance and habits have changed very little. It is called the "living fossil" in the ocean and is of high value in the study of biological evolution and paleontology. It also has a place in bionic science. In 1954, the world's first nuclear submarine "Nautilus" developed by the United States was developed by imitating Nautilus.

Most of the people on the knowledge ship basically know it.

The name of Nautilus is well known to almost everyone.

It was precisely because of the thunderous sound that they all paid special attention when Professor Chen Yu's words touched their blind spots in knowledge.

"Professor Chen, is the straight-shelled nautilus you mentioned also a nautilus? Why have I never heard of this kind of nautilus, let alone such a large snail. There are no conch snails, let alone snails." Fang Youqun excitedly said .

"Don't worry." Professor Chen Yu raised his hand and pushed the gold-rimmed glasses on the bridge of his nose, and after pondering for a while, he said: "You haven't heard of a sea creature like a straight-shelled nautilus, it's so normal. Because of the rarity of this creature, it even exceeds Tyrannosaurus rex."

"It is more rare than Tyrannosaurus rex? Tyrannosaurus rex has long been extinct. Could it be that this straight-shelled nautilus is also extinct?" someone asked.

"Extinct, extinct for a long time, before the appearance of Tyrannosaurus rex, the straight-shelled nautilus became extinct, but it used to be the overlord on this planet, and it was also one of the earliest overlords on this planet. The second overlord on the planet." Professor Chen Yu sighed.

Everyone stared blankly at Professor Chen Yu, as if listening to the Arabian Nights.

"Teacher, what do you mean, this is a fossil left by an ancient creature?" asked a middle-aged bald scientific researcher.

Professor Chen Yu nodded, "It can indeed be said that the straight-shelled nautilus was the top predator in the Ordovician oceans of the Paleozoic Era. Later, due to the emergence of more powerful creatures or other reasons, in short, it became extinct. Its close relative, the small convoluted nautilus, survived because of its small size, curly shell and tenacious life."

"I don't agree that the straight-shelled nautilus is extinct because stronger creatures appeared in the ocean. When the straight-shelled nautilus entered its prosperous period, they were huge, up to 6-10 meters long, with a shuttle-like shell, and sprayed water. It moves forward, swims quickly, and will quickly chase after the prey is found, and then capture it with its tentacles. At that time, most animals would surely die if they were targeted by straight-shelled nautiluses." An old biologist said.

"What I'm talking about is just a guess." Professor Chen Yu said with a smile: "It's because I don't believe it that I need to study it. Understanding the process of life and providing support for human beings to deal with the catastrophe of mutations is what we people do. Responsibility and mission?"