Trilobites are an extinct group of marine arthropods.

Trilobites are an extinct marine arthropod. They are the most representative ancient animals that appeared in the Cambrian period 560 million years ago. They are a type of arthropod with whole body It is clearly divided into three parts: head, thorax and tail. The carapace is hard and has two dorsal grooves. The carapace is divided into three roughly equal parts longitudinally, namely one axial lobe and two costal lobes, hence the name trilobite.

Trilobites reached their peak between 500 million and 430 million years ago, and were completely extinct in the Permian 240 million years ago. They have survived on the earth for more than 320 million years. It can be seen that this is a type of A creature with great vitality. Over a long period of time, they have evolved into many types, some up to 70 centimeters long, and some only 2 millimeters long.

Classification of Trilobites

In animal taxonomy, trilobites belong to the class Trilobites and Arthropods. They lived in the ancient oceans, mainly appeared in the Cambrian period, and reached their peak in the late Cambrian period. Since then, trilobites have declined from their peak of prosperity to extinction at the end of the Permian, and did not enter the Mesozoic.

Trilobites have flourished throughout the long geological history of more than 300 million years in the Paleozoic Era, and have multiplied into numerous groups and huge numbers.

The class Trilobites can be divided into 10 orders: Glomeridae, Laidelichia, Cryptocephala, Fructus, Lentozoa, Schizophora, Ctenophores, Fusariums, Trichocephalopods and Odontozoa. There are more than 1,500 genera and more than 10,000 species in total, of which about 500 genera are found in my country.