Hoplomachus Equipment

[cn.caelius]

To add to this topic, I have a question. What sort of shield was used by a hoplomachus? I've seen two kinds: larger hoplite or deep bowl style, and smaller forearm shield. Is the difference based on time period? For example, would an earlier hoplomachus have the larger hoplite shield and the later, more stylized gladiators, used the small (12-15") shield?

Gratias!