What is "mallagnostus"

Mallagnostus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the upper Lower Cambrian, with remains found in USA (New York), Canada (Newfoundland), Spain, England, Russia (Tuva, Gorno-Altayskaya), Mongolia, and the lower Middle Cambrian according to fossils from China (Tian Shan) and Russia (Yakutia).