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Table 1 Abbreviations used in figures

From: Arthroaspisn. gen., a common element of the Sirius Passet Lagerstätte (Cambrian, North Greenland), sheds light on trilobite ancestry

af

axial furrow

afl

articulating flange

ahr

articulating half ring

an

axial node

ar1–3

pygidial axial rings

atl

antennula

aw

anterior wings of hypostome

ba

basipod

blj

body–limb joint

Cgd

midgut diverticula of the cephalon

C1–3s

sternites of cephalic segments

C/T

cephalothoracic boundary

d

doublure

dar

doublure of axial ring

dm

doublural margin

endp

distal prong of endopod podomere 7

en

endopod(s)

en1–6

endopod podomeres 1–6

ex

exopod(s)

exdl

distal lobe of exopod

expl

proximal lobe of exopod

gl

glabella

hy

hypostome

il

inner lamella

mn?

possible median node

mr

marginal rim

ms1–11

pygidial marginal spine

on

occipital node

or

occipital ring

OS

occipital segment (fourth appendage bearing segment

P1

first pygidial segment (15th trunk segment/20th appendage bearing segment)

pa1–3

postantennular appendages 1–3

phs

prehypostomal sclerite

pc

preglabellar sagittal crease

pw

posterior wings of hypostome

T1–14

tergites 1–14 (tergites of fifth to 19th appendage bearing segments)