i think it could be a type of insect...
Cnidarians are the most diverse group.
silicates
Silicates are the most abundant mineral group on Earth. They make up over 90% of the Earth's crust and are mainly composed of silicon and oxygen, often combined with other elements such as aluminum, iron, magnesium, or calcium.
Si
Insects
sodium
The most abundant minerals belong to the silicate mineral group, which are composed of silicon and oxygen atoms. Examples include quartz, feldspar, and mica.
The group with the most species is that of the arthropods - insects, arachnids and crustaceans. But molluscs and the three groups of worms also make up a good part. Vertebrates is just another group like the arthropods for example - "invertebrates" is incredibly general. There are way more invertebrates than vertebrates.
They are complex invertebrates that are common in a variety of marine habitats, and include starfish, brittle-stars, sea urchins.
invertebrates
invertebrates
Worms make up the largest group of complex invertebrates.