Page 397 - Introduction to Paleobiology and The Fossil Record

384 INTRODUCTION TO PALEOBIOLOGY AND THE FOSSIL RECORD

dorsal
muscle scar third thoracic leg
egg
mandible
eye
antennule carapace

ANTERIOR POSTERIOR

antenna
furca
maxilla claw
mandible beside mouth
first thoracic leg
second thoracic leg
ventral
(a)
Dorsal
marginal zone (fused
hinge part of inner lamella)
selvage
dorsal
free part of
muscle
scars inner lamella
Height Posterior Anterior
line of
concrescence
outer margin
marginal-pore central normal
canals muscle scar pores inner margin
length
(b) Ventral

Adont hinge

Merodont hinge

Amphidont hinge

posterior element
median element
(c) anterior element
Figure 14.22 Descriptive terminology of the ostracode animal (a), including muscle scars (b) and hinge
structures (c). (Based on Armstrong & Brasier 2005.)