pygidium
noun
py·gid·i·um pī-ˈji-dē-əm 
plural pygidia pī-ˈji-dē-ə
: a caudal structure or the terminal body region of various invertebrates
pygidial
pī-ˈji-dē-əl
adjective 
Example Sentences
Recent Examples on the Web The trilobite spans 146 meters from cephalon to pygidium, or head to tail, and is carved into the shape of a spiny Ceraurus trilobite instead of the plainer state fossil, Calymene. 
Giorgia Guglielmi, Science | AAAS, 22 Sep. 2017
Giorgia Guglielmi, Science | AAAS, 22 Sep. 2017 Word History
Etymology
New Latin, from Greek pygidion, diminutive of pygē rump
First Known Use
1848, in the meaning defined above
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