Answer
mammals
Work Step by Step
Amniota includes reptiles and mammals. The synapomorphy, or shared characteristic, of these lineages is the amniotic egg, which is encased in a shell or membrane.
Biological Science (6th Edition)
by Freeman, Scott; Quillin, Kim; Allison, Lizabeth; Black, Michael; Taylor, Emily; Podgorski, Greg; Carmichael Jeff
Published by
Benjamin Cummings
ISBN 10:
0321976495
ISBN 13:
978-0-32197-649-9
Chapter 32 - Deuterostome Animals - Review - Page 680: 3
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