The died-out sea arthropods patrolled oceans more than 500 million years ago and were one of the largest animals of the time. The research of fossil remains of these creations conducted by specialists of Northwestern University (Xian, the People's Republic of China) has shown that their tiny cubs were also born murderers.
Arthropods which spiders, insects and Crustacea are among because of the frightening look often become an inspiration source for scientific fantasts. Some of the oldest and primitive types of arthropods belong to the group called by Radiodonta which have been armed big pricking (or taking) appendages on a forward part of the head and a round mouth with sharp teeth. These animals, including anomalokarisa (Anomalocaris), are considered as the largest predators of the time. In length they reached one meter and more. The hardened remains of representatives of this look more than 500 million years are found by age in North America, China and Australia.
As trained, tiny cubs of the radiodont already at an early stage of development note adult individuals were born murderers, as well as. Scientists consider that millions years ago well "equipped" arthropods ready to hunting since the birth, have exerted strong impact on other types. During the evolutionary "race of arms" their potential production should or develop protective mechanisms, or to die.