i am not too sure about it myself. Annonaceae members can be tricky. When i lived in the tropics seen some veritable annona trees with excellent fruit, but couldn’t identify the species. The locals say they their “grandma or neighbor planted them” but have no clue from what fruits the seeds were taken from… There were super sweet ones, and there sour ones. I have eaten an extremely sour guanabana that if it were up to me-- i would reassign into another species just because, haha
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I have also seen guanabanas that look like that being black but especially with the size at over 7lbs that thing is enormous all the annona (very few) i have seen where much smaller.
We want pictures of the insides and you to plant the seeds
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Or maybe mail us some seeds? 
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Definetly soursop
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Even with the crazy elongated spikes?
Not doubting you, but that’s not characteristic of most soursops.
Though the size of it does tend to exclude biriba.
Welcome to our community,Tropical_Bay_Area.
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Yeah but when the fruit are unripe, their definetly like that weee a developing soursop and you will know excactly what I mean
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Yeah I’m starting to think it’s guanabana after all. Either immature or just a quirky specimen.
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Hard to imagine it’s immature at that size, but could be. It’s a yuge baby!
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