Mystery seed from haiti!

[swords]

Here's a real quiz for you plant freaks out there...

I just received a large shipment of seashells from Haiti and in the bag was this object that clearly was not a seashell. At first I thought I had a round flat stone but it was too light for a rock as I looked it over I noticed it has an indentation just like a seed and the shell is very hard and to germinate will likely need to be scarred.

Here's the seed:

the seed is about 6 cm in diameter and weighs about 1-1.5 ounces. It is not totally round but flattened like a pebble and only 1.5 cm thick. The image below shows the thickness and the pink aperture:

What family of plant could this belong to? I'm not looking for species specific names as that could proove impossible. Any germination suggestions?

 

[gardenofeden]

looks like a sea bean (pea family). Entada gigas. from the west Indies so warm & sunny!!

 

[goldtrap2690]

wel , you can try to germinate it to figure out what it is . other wise you can just keep guessing or ask whoever sent you those seashells if they have soke plant that is making seeds .