APA Algodoal/Maiandeua is located in the municipality of Maracanã, northeastern coast of the state of Pará, occupying an area of 385 ha. between the geographical coordinates of 00°34'4/1 to 00°34'30/1 5 and 47°31'05/1 to 47°34'12/1 W. The area consists of mangrove vegetation in the southern, central and northern portions of the island; hypersaline fields covered by herbaceous vegetation inside or near the mangroves; barrier formation in the interior of the island and restinga vegetation covering much of the sandy plain, in the northern, northeastern and western portions of the island. The present work deals with the survey of Chrysobanaceaes species. The family Chrysobalanaceae consists of about 521 species, distributed in 18 genera. The genus Licania (151 sp.), and Hirtella (89 sp.), are the largest and both are primarily located in the Neotropics. The Family Chrysobalanaceae is one of the most abundant families in central Amazonia. For the study of the Chrysobalanaceae of the APA, material already herborized and incorporated in the collection of the João Murça Pires herbarium, of the Museu Paraense Emílio Goeldi (MG) was used; all material was hydrated in 70% alcohol solution, in order to facilitate the description and illustration of the species. Through bibliographic reviews and collections identified by specialists, the differential characteristics of the taxa were confirmed and an identification key for the species occurring in the APA was assembled. Five species were found for the family, distributed in four genera: Chrysobalanus icaco L., Hirtella ciliata Mart. et Zucc., Hirtella racemosa varo hexandra Willd. ex Roemr. et Schult, Licania octandra subsp octandra Hoffmanns. ex Roem. & Schult. Kuntze, Parinari campestris Aulb.
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