What is "plutonides"

Plutonides is a genus of trilobite, an extinct group of marine arthropods. Species occur in the middle Middle Cambrian of Russia (Siberia), Mongolia, England and Wales (Triplagnostus gibbus and Triplagnostus fissus Zones), Sweden (Triplagnostus fissus–Ptychagnostus atavus Zone), eastern Canada (eastern Newfoundland, Nova Scotia, Plutonides hicksi Zone), and the Czech Republic (Skrije - Týřovice Area). The frontal lobe of the central raised area (or glabella) of the headshield (or cephalon) overhangs the short frontal border and it is slightly pointed, rather than rounded or truncate. This character is shared with Anabaraspis, but in Anabaraspis there is a wide area in front of the glabella without a differentiated border and preglabellar field.