Trilobites

?
G X E Q R O Y J S B G T A O L U K D V I V
F Q U I P C F I I U S S B O N D A O W S G
O D E Y W G V B V U Q S I Y G Y O A A U M
A J D I Y Q F R J X U A K L Q M B I Y R Y
T F I C K S M N G T K L K U T L J G H G G
P T H R I F G P F I S C O S R L C K M Y M
H X D E F I N E M A C R O P Y G O U S L L
Y L W H A T I S E C D Y S I S W D N L H J
L W H A T I S T H E L I B R I G E N A M Q
U E Q U T I F L Y T T W U U P U Q T C K M
M S A C Y N F P P V N A F X G U V B O A T
W H A T I S T H E A P L E U R O N H T L K
Y W S P B I L U M L U N B S S J X H I Y A
W H A T D O E S I N F A U N A L M E A N X
B Y B C T T I M Y S K E L E T O N L W X A
G R C W K E G P F E O Q N S Q U J R C W O
J Q F R P U D W J P I A G P D X G N A D T
C F Q L G D E F I N E I S O P Y G O U S C
M C W W H A T I S T H E G L A B E L L A I
O P H L D A N J E D Q Y Y W U O A P D N F
K H O W D X N M T F R F K T R R A H U G Y

Clues

  • 'free cheek' part of cephalon which breaks away from the skeleton during ecdysis (4, 2, 3, 9)
  • Arthropoda (6)
  • Hard exoskeleton, made of chitin (8)
  • Living in the sediment, maybe a burrower (4, 4, 8, 4)
  • Part of the cephalon which is formed by the presence of the stomach, which is inside the head (4, 2, 3, 8)
  • Segment adjoining the axis (4, 2, 3, 1, 7)
  • Trilobita (5)
  • Where the cephalon and pygidium are of similar sizes (6, 9)
  • Where the pygidium is larger than the cephalon (6, 11)
  • Where the trilobite shed its exoskeleton at various times in its life (4, 2, 7)

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