What is the maximum number of different aliens per-battle?

[The Martian]

(Question)
I'm currently reading the alienRaces: section of the UFOpaedia, am I correct in my assumption that members: controls which aliens are able to be found in a battle making the max different types of alien units per battle 8?

Alien crew associated with this alien race (e.g. race units + terrorist units), defined by a list of unit string IDs. Order here will define rank in terms of deployment. Generally speaking the order is:

    0 - Commander
    1 - Leader
    2 - Engineer
    3 - Medic
    4 - Navigator
    5 - Soldier
    6 - Terrorist 1
    7 - Terrorist 2

but of course, not all races have all ranks, so the "fill in" rank would be listed multiple times (see Ethereals).

Edit:
If I am understanding correctly membersRandom: (OXCE) can be used to drastically expand this by making each members: slot pull from a different list of potential enemies each time one is placed.

Alternative to members. Instead of defining just a single unit type per alien rank, you can define any number of unit types here and one will be chosen randomly (each time a new unit is generated). To increase a chance of a certain unit type being selected, you can add it multiple times.

So in OpenXcom the limit would be 8 but in OXCE the limit is much higher.

[Warboy1982]

actually it's not limited in openxcom either, you can have 200 ranks if you want, but your equipment loadout lists need to be long enough to accomodate them

[The Martian]

200 different aliens at once, wow!
(One more reason to keep extra ammo in the Skyranger.)

I'll keep it in mind that I need a loadout list with a matching length.

Thank you for the information.