Apparently "Frutipedia" confused photo, and I hoped this optical effect distortion size. Sorry.
But where does the name "Groundsop"? And what size these fruits?

Here is a write: "Food scientists say the junglesop is just one of several varieties of custard apple fruits that are grown in Africa but have been ignored by Western food scientists.
In southern Africa, another is the yellow or reddish colored groundsop [Annona stenophylla], a fruit who pumpkin colored flesh is eaten both raw and cooked".
http://www.voanews.com/content/a-13-2009-05-28-voa51-68825652/413874 .html

David, sorry my bad English.  "Glad to help" was related to the previous post of Sanddollarmoon.

 I also dream about Groundsop. I hope Soren from Uganda (recently wrote to him) ever find the right person in Tanzania, Zambia or Zimbabwe, able to get these seeds.

Glad to help!
A truly african rare - Annona stenophylla or Groundsop http://www.fruitipedia.com/ground_sop_annona_stenophylla.htm, even Soren from Uganda has not yet received its seeds and Rachel, too, not promises.

Will look like its hybrid with the A. muricata? if it is possible...

If you find these seeds, tell me please! I would also like to buy them.