That's what it looks like

Plant it in soil. They send out a root first -- usually. Of course there's always a chance the sprout rotted from too much water. I would say plant it and wait.

It looks like a goner to me. Rotted. But by all means plant it and cross your fingers.

Thank you for the advice. I'll plant it in a pot and wait.

P. S. I think I'll open next mango seed to understand better what's inside because I can't comprehend how it is possible that the root is growing so greatly and the plant itself would be dead...

Thank you! Inspired by your answer, i opened the seed and inside was a little sprout. The seed was beggining to get rotten near to tre root, so i thought it was the only way to save the plant. Now it got partially dry, but it doesnt look too bad, so maybe it will survive.

Thanks once more!

Can you show us what it looks like now?

I received a mango seed purchased on ebay. Looked up on the internet how to grow this seed. I read to take the outer seed very carefully off and plant. One died while the other is growing and about 8" tall.

Summer is coming and I look forward to growth.

My friend from India said they just put the seeds in a pot in the shade.

Unclear the state of "seeds" that Indians put. Read unambiguous terminology in my posting above.

That's how it is today. Slowly growing ahead! I'll wait for spring to put it in the soil, so it can survive on my balcony.

That's how it is today. Slowly growing ahead! I'll wait for spring to put it in the soil, so it can survive on my balcony.

It needs soil (granular growing medium) NOW.

Mango varieties are either polyembryonic and come true-to-type, or monoembryonic (and won't be exactly like the parent). Ataulfo is an example of a polyembryonic mango. Kent is an example of a monoembryonic mango.

Potted! Gets better now. Thank you "

four (9B near 9a)"

Meanwhile I potted successfully two other mangos. I live in north Italy where no mango can survive outside in winter (night temperatures about - 1°Celsius) so I'll just keep them in pots and put outside for the summer.

The two survived. The one in the green pot, didn't...

Looking good. Keep us posted on their progress.