INTRODUCTION THE NON-MINERALIZED arthropod described herein is derived from the Sirius Passet fossil conservation deposit of North Greenland (8247.6'N, 4213.7'W), the oldest locality with exceptional preservation of soft tissues known from the Cambrian of Laurentia (Cambrian Series 2, Stage 3; Nevadella Zone). First tergite roughly same width (tr.) as head shield. First postantennal limb protrudes from anterolateral margin of head shield close to antennae (Fig. 4.1).