CATDOLL : CATDOLL: What is the difference between an octopus and a jellyfish?

What is the difference between an octopus and a jellyfish?

The difference between octopus and jellyfish: different shapes, different species, and different reproduction methods.

1. Different forms

There are 26 genera and more than 252 species of marine mollusks in the family Octopus, and their sizes vary greatly. The body of an octopus is short and oval, sac-shaped, and finless; the boundary between the head and the body is not obvious. The head and body of an octopus are about 7 to 9.5 cm long, with large compound eyes and 8 retractable arms. Each arm has two rows of fleshy suckers. The arms of a short octopus are about 12 cm long, those of a long octopus are about 48.5 cm long, and those of a true octopus are about 32.5 cm long.

octopus:

Jellyfish:

The jellyfish body is bell-shaped, inverted bowl-shaped, or umbrella-shaped. The convex side is called the outer umbrella or upper umbrella, and the concave side is called the lower umbrella. There is a drooping tube in the center of the lower umbrella called the lip, and the free end of the lip is the mouth. There is a circle of tentacles on the edge of the umbrella. A narrow membrane structure extends inward from the edge of the lower umbrella of the hook-handed jellyfish, called the marginal membrane, which is a characteristic of Hydrozoa jellyfish.

2. Different species

Octopus: A general term for 252 species of marine mollusks in 26 genera of the family Octopus. It is the largest family of cephalopods and can be divided into the subfamily Myriapodinae, Aertocodontinae, Grainedoninae and Corydodontinae.

Jellyfish is a lower invertebrate zooplankton, carnivorous animal, taxonomically belonging to the phylum Cnidaria, class Scyphozoa, with more than 250 known species.

3. Different reproduction methods

Octopuses are dioecious. The male has a specialized arm, called the peduncle arm or the copulatory arm, which is used to place the spermatophore directly into the female's mantle cavity. During the breeding season, female octopuses lay eggs, which are about 0.3 cm long and number more than 100,000. They are laid under rocks or in caves. During the incubation period, the female guards the eggs, cleans them with a suction cup, and stirs them with water. After the female octopus lays eggs once, the larvae need to hatch after 4 to 8 weeks.

Jellyfish are dioecious, with reproductive glands near the stomach sac. Mature sperm flow into the female jellyfish for fertilization. The fertilized eggs develop into larvae and leave the mother's body. After swimming in the water for a while, they sink to the bottom of the sea to form larvae, and then become polyps. The polyps split into several disc-shaped larvae, and then develop into adult jellyfish.

Reference source: Baidu Encyclopedia - Octopus

Reference source: Baidu Encyclopedia - Jellyfish

The differences between octopus and jellyfish are as follows:

1. Different reproduction methods

Octopuses are dioecious. The male has a specialized arm, called the peduncle arm or copulatory arm, which is used to place the spermatophore directly into the mantle cavity of the female.

Jellyfish are dioecious, with reproductive glands near the stomach. Mature sperm flow into the female jellyfish for fertilization. The fertilized eggs develop into larvae and leave the mother's body. After swimming in the water for a while, they sink to the bottom of the sea to form larvae, and then become polyps. The polyps split into multiple disc-shaped larvae, and then develop into adult jellyfish.

2. Different distribution ranges

Octopus is distributed in Jilin, Liaoning, Shaanxi, Hubei and other places in my country. Octopus belongs to the Fagaceae family, which are different families and are easily confused.

Jellyfish are distributed in Hainan, Guangdong, Fujian and Vietnam in China.

3. Different species

Octopus: A general term for 252 species of marine mollusks in 26 genera of the family Octopus. It is the largest family of cephalopods and can be divided into the subfamily Myriapodinae, Aertocodontinae, Grainedoninae and Corydodontinae.

Jellyfish is a low-level invertebrate zooplankton, a carnivorous animal. Taxonomically, it belongs to the phylum Cnidaria and class Scyphozoa. There are about 250 known species.

Reference source: Baidu Encyclopedia - Octopus

Baidu Encyclopedia - Jellyfish

Jellyfish, also known as sea jellyfish, are important large zooplankton in the ocean and belong to the phylum Cnidaria. The body of a jellyfish is soft and does not have a hard skeleton. Some whisker-like stripes grow from the edge of the umbrella-shaped body. These stripes are called tentacles. The tentacles are poisonous and are the tools of jellyfish for hunting and defense. Octopuses belong to the order Octopoda or class Cephalopoda of molluscs. Octopuses have 8 arms and legs, and there are many suckers on them; sometimes they spray black ink to help them escape. Some octopuses have quite developed brains.

Octopus: Mollusk, Octopus, Octapeda, 8 tentacles, soft, can spray ink multiple times

Squid: Mollusca, Cephalopoda, Order Ten Arms, Ten tentacles, head with a calcareous hard shell, can spray ink but the ink is less

Jellyfish: A very ancient organism of the coelenterate class, with a history of 500 million years. They have no brain or internal organs, most are transparent, and almost all species are highly toxic.

Jellyfish: A type of jellyfish belonging to the order Rhizostomata and the genus Medusa. Like other jellyfish, the tentacles are also highly toxic, but the tentacles above the tentacles are basically non-toxic, and it is generally easy to remove the toxins during processing.

(Jellyfish skin: the cap of the jellyfish, which is larger and flatter) (Jellyfish head: the tentacles, which are very crisp and delicious)

MapleStory 51 Gun Warrior Upgrade Route to Level 120

It's pure nonsense!!! If you cheat... it will be inconvenient when there are too many people... If you don't cheat... you can't compete with too many people... So at level 51, you can go to Dongfang Shenzhou... that is Shanghai... Go to Xuzhou 2 to fight cows and sheep... There are many big monsters in that map, and the experience is about the same as that of the green snake... But... No one will come if you cheat for a whole day... At level 60... Go to Dahonghua Road 2, which is the ordinary violent bear and Simba Lion... At level 65, go to Dahonghua Road 1, the snake flute master and the hunting dog. Generally, you can reach level 70 in 3 hours... After level 70, go to Theme Park 2. Fight the high-hat violent bear and the clown Simba Lion... Until about level 78... Go to Xinye City to play spiders... There are few people in spiders now... Cheating to level 90... Don't go to Uru... There are too many people there... Go to Baicaotang! The experience there is not much less. . But don't worry... There are few people... Play one map after another... Until level 100... Then don't go to Uru... Because it's too popular... You know... Go straight to Shenmu Village... Continue to play one map after another... It should be within a day... If you have a pet, you can also pick up books... Centaurs drop rare hidden weapons that hurt 20 people, wouldn't it be good to sell them for tens of millions as medicine money? ? After level 120, go to the big grass flower in Uru and survive until about level 132... Go to the mine zombies in the snowy area... When you reach level 144, go to the temple... Don't forget to bring enough medicine. It costs 1 million to go back and replenish it once! When you reach the temple, you can play until level 200... Hope you can adopt... Thank you