Question for Latin speakers

[Memmia]

Hi,

I am only familiar with clipeus (also sometimes spelled clypeum) being used as referring a shield or other protective disk (obviously 'clipeum' being in the accusative form of clipeus).
Even in biological terms 'clipeus' refers to a protective part of arthropod anatomy so I am surprised to see it refering to a spear.

I will ask my Latin tutor though to confirm

Hope this helps