Extended Data Figure 3: T. borealis MGUH 30501 frontal appendage with well-preserved auxiliary spines.
From: A suspension-feeding anomalocarid from the Early Cambrian

a, Part. b, Detail of auxiliary spines in a. c, Schematic drawing of MGUH 30501, from a combination of part and counterpart. d, Counterpart. e, Detail of d showing regular arrangement of auxiliary spines.