It just means the system is self-contained, that is, it can operate without connection to a shore-side (city) sewer system. So yes it has to have some kind of holding tank. Note: porta-potties are technically marine toilets.
Depends on the individual chronicling the description.
Normally I would assume YES.
There are hand-Pump Marine toilets & Electric Marine toilets which would both require a black tank. BUT, then you have situations where someone lists a "portable" toilet as a Marine Toilet. Probably because the manufactures sometimes refer to theirs as a 'marine toilet' in the description of these. So would confirm with the seller just to be sure.
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