Wow! Gorgeous! Give us more information---for example, where dwells this beauty? Welcome to the Forum!
The plant was bred in Miami by IAS member and aroid pollination expert LariAnn Garner. LariAnn has produced many, some even much larger including Alocasia robusta crossed with Alocasia odora. You likely will find much more information on her website here: http://aroidiaresearch.org/
This beauty dwells in my backyard:) I noticed, piling compost such as branches and all garden clippings around this plant, make them grow huge!!!!! I have quite a few. I love her hybrid robudora , which I also grow. It had powdery underside just like robusta. Mine is growing larger now. The biggest leaf is about 4 x 3. I just repotted the plant in a twenty gallon container. Can't wait to see how big she gets. I'm sure she will outgrow the portora!!!