A very confusing species Marlene . I have spent time and I think yours is a hybrid of
Alocasia amazonica. using .
A. watsoniana X A. sanderian
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I don't think its A. longiloba.
A. watsoniana is classed as A. longiloba which in turn is confused with A.micholitziana.
You could go crazy trying to sort out the correct Alocasia names ,abut its an interesting subject.
I'd be interested to see if any other GD member has an opinion.