The Custard Apple is Annona reticulata. The fruit shown beow was maturing during the late dry season, in March, while most of the tree's leaves were falling off.
Custard-Apple fruits are variable. When ripe they can be yellow or brownish with a pink, reddish or brownish-red blush, and their skin can be faintly, moderately, or distinctly impressed with a scaly effect. The somewhat granular flesh contains many hard, dark-brown or black, glossy seeds and a pointed, fibrous, central core that's attached to the stem. The flavor is sweet and agreeable but often not considered as flavorful as the closely related Sweetsops. Custard Apples are thought to be native to the West Indies, but were carried into the Yucatan in prehistoric times.