The different species of starfish form the same group of invertebrate animals. In species classification or taxonomy, these animals are part of the asteroidal class. Asteroidea
Certain organisms that remind us of the stars of the firmament
The asteroid name has a logical explanation, since the appearance of these invertebrates is very similar to that of some stars in the sky. In this sense, it should be noted that the word asteroid was first used by the English astronomer William Herschel to designate celestial bodies that look like stars, but which in reality are not.
From the point of view of species classification, starfish are not fish, but echinoderms (sea urchins and ophiroids are also part of this classification). Asteroidea
These organisms lack brains and blood. While most have five arms, some species can have as many as fifty (for example, the Antarctic starfish). Both your arms and your body can regenerate completely.
Its arms are born from the central disc of its body and below this structure is the mouth of the star.
These echinoderms have calcified skin that serves as protection against the threat of predators. Likewise, the skin has bright colors in order to frighten its possible aggressors.
Its body structure has different textures, as some species are smooth and others spiny or grainy. Anyway, they are all covered by overlapping bone plates.
Their nervous system is not centralized, as they are able to perceive their surroundings from any part of their body (the sensory cells in their skin allow them to perceive light or the action of marine currents).
Most species measure between 12 and 24 cm in diameter. This general rule has exceptions, as some species have a few millimeters and others measure more than a meter. Asteroidea
In terms of distribution, they are present in all of the planet’s oceans, both in cold and tropical waters, in coastal areas or thousands of meters from the surface. However, they do not exist in fresh water.
The radial symmetry of these invertebrate animals is one of their most unique features (the symmetry of the starfish is similar to that of sea urchins in their skeleton).
In relation to your diet , take a carnivorous diet of small invertebrate organisms such as clams and oysters. To feed on the prey, it places its feet on them and then secretes an anesthetic substance that paralyzes them.
These marine invertebrates are more active at night. Its displacements are possible due to the action of its tube feet that incorporate suction cups adapted to the depths of the marine environment. Asteroidea