What is the Largest Invertebrate Animals?

Animal Kingdom

The animal kingdom comprises millions of living organisms, which are divided into two main sections: vertebrates and invertebrates. This kingdom is made up of all eukaryotes, multicellular organisms, and all living organisms in the animal kingdom rely on other organisms for their food; that is, they are not self-feeding. 800,000 different species were identified in 36 divisions, including the Birds, Mammals, Reptiles, Fish, Amphibians, and all of the vertebrates. Invertebrates include sponges, stings, worms, molluscs, arthropods, and skin lice.

The largest invertebrate animals

The giant squid is the largest and largest invertebrate animals ever known, and the heaviest in the world. Although these organisms were known only from a few dead parts (because of the severe difficulty of holding them), scientists have managed to capture a number of them over the past years. They can not be controlled directly because of the deep depths in which they live, but scientists believe - from the study of their samples - that they catch their prey with ambiguity, taking advantage of its bright members that attract the attention of fish and other organisms deep in the sea to approach and then break them. 

Biologists learned of the existence of giant squid for the first time since 1925, when they began to discover the remains and parts of his body in the whales of the giant amber whale, but it was not possible to see a giant squid (even dead) until 2003 when it was first caught in A depth of more than 2000 meters below the surface of the water, it was 10 meters long, and weighing more than 500 kg, and therefore it has become the largest animal species known to humans at all. 

Invertebrates

Invertebrates are all animal species belonging to the animal kingdom that have no internal skeleton or spine. They represent the vast majority of all living organisms on the planet. Scientists estimate that they are between 15 and 30 million species, which is 90% or more All kinds of animals. These creatures live all over the world; their existence has been documented even in the deepest caves, in the oceanic depths of more than 10,000 meters, in the upper atmosphere, in the aridest deserts and in the coldest and colder regions - 35 C.

Invertebrates are found in a very diverse range of shapes, species and sizes, but they are generally small in size compared to vertebrates; their land sizes range from less than one millimetre (making their visibility impossible) and even 1 to 2 meters. The group of invertebrates consists of small organisms in nature, including insects, spiders, caterpillars, worms, and scorpions. They also include many aquatic organisms, such as crabs, octopuses, binders, jellyfish, sponges, etc. 

The invertebrate group has many characteristics, most notably the property is given by its name; its lack of the spine, as well as the entire skeleton, but on the other hand, almost all invertebrates have a relatively solid external structure that helps protect their bodies, but they may also be slow and small Size due to lack of bone.

Invertebrates have no sophisticated respiratory equipment; they have no lungs, but absorb air through the skin. Most invertebrates have organic tissues, and although most species are able to move, some do not, such as a sponge that sticks to the seabed throughout life. 

Classification of invertebrate animals

Invertebrates in terms of scientific division are divided into several groups, each called Phylum. These groups are the supreme and fundamental divisions of the animal kingdom. There is no complete scientific agreement on the number of these divisions. As the science progresses, To a new people or to the merging of ancient people with each other, but in total, the population of animals is about 20 to 30 divisions, and in all their classification, vertebrates (including fish, reptiles, amphibians and mammals) E, and the others are all back to the different types of invertebrates. 

The most prominent people of scientifically classified invertebrates now are the following:

Arthropods: The largest and most diverse group of invertebrates, organisms whose body is made up of joints and a solid external structure to protect their bodies. Its bodies are divided into three parts: the head, the chest and the abdomen, many of which live in water. Arthropods include many of the most important invertebrate groups, including all insects, spiders (including ticks), crustaceans (crabs, shrimps), scorpions, and legs (forty-four).

Molluscs: The second largest group of invertebrates, living on land, characterized by its nonparticular and soft-limbed bodies, has a thin outer shield to protect it and has the advantage that its head is slightly separate from the body, such as octopuses, binders, and clasps. 

Sponges are living organisms in the sea, rarely in freshwater, fed by water filtration for their own plankton and small organisms. They begin to develop tiny worm-like larvae before they turn into their immature form. The sponge is characterized by a simple, porous body, made up of spongy fibres.  These organisms have no nerves, muscles or even internal organs, and have more than 5,000 species.

Flatworms: flatworms, worms that are characterized by flat bodies of both sides and bilateral symmetry, have no cavities and only have simple neurotransmitters, most of the parasites; that is, they prey on the bodies of other animals, and they live in the seas and marshes and dead trees, The length of one millimetre or more, and may be up to several meters.

Stomachs: They are also known as the digestive system. They are organisms whose body contains stray cells. It has a single vertical cavity that works as a puff and an anus at the same time. Its bodies are composed of two layers separated by a gel material, most of which live in water. The most prominent species are corals, anemones, and jellyfish.