"-spides" comes from "Aspis" AFAIK, which is a fairly large round shield. Units with Aspis shields are for example:

Hetairoi Aspidophoroi
Baktrion Agema
etc.


AFAIK the Peltastai in EB carry "Thureos" shields. You can see the Pelte (or similar forms) on units like:

Anatolikoi Phyletai
Gund-i-Palta
etc.

The Caetra also seems to be a fairly widespread design.

Most "barbarian" troops use variants of the Thureos.