There aren't that many Reaper designs in the ME2 ending cinematic. I went over and categorised them in this image:

In the "side shot" of that sequence you also see some non-3d sprite proto-destroyers.
All-in-all I'd say that the "just-a-tail" ships are processors or carriers. After that there is just one reaper type we don't see in ME3: The wide-mouth-flaired-tail type.
The Reaper "schematic" image that turns up in Keji's greybox/end scene of ME2/Cerberus base in ME3 is supposed to be Harbinger (You can tell by the extra central plume that Harbinger had in ME2 but was removed in ME3)
Sovereign (ME1) was almost itentical to Harbinger (ME2) except for:
1. Harbinger lacked the middle "leg" (or "nose tentacle")
2. Harbinger had an extra "plume" or "crest" of armour running up it's center
3. Harbinger had those glowing eyes.
Additionally Sovereign has an extra "docking tube" attached when he assaulted the Citadel in ME1. But it doesn't appear to be a natural part of it.
Modifié par Mobius-Silent, 20 juin 2012 - 09:21 .