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Mouriri guianensis is a Brazilian endemic plant species distributed throughout the Amazon forest, Caatinga, Mata Atlântica and Cerrado domains, extending northward into Venezuela. The aim of this study was to describe the flowering phenology, floral biology and visitors associated with M. guianensis, highlighting the crepuscular bee species Megalopta amoena. Mouriri guianensis flowers from September to March. The flowering, the details of floral biology and the activities of floral visitors were observed for ten individual plants in December 2013, January-March 2014, September-December 2014 and JanuaryMarch 2015. The flowering peaks occurred in December 2013 and in November-December 2014. Bees were collected in January and February 2015. A total of 86 individuals belonging to six bee species were recorded visiting the flowers, with Xylocopa cearensis making more than one-half of the visits (60%), followed by Melipona subnitida and Megalopta amoena with 21.17% and 9.41% of the visits, respectively. The visitors showed activity peaks between 5:00 and 6:00 AM (66.27%). Buzz pollination was their predominant behavior. Megalopta amoena used its jaws to open the pore and the anther gland. Melipona subnitida used parts of the glands to seal the entrance to the colony. The visitors, except for Augochlopsis sp. and Trigona sp., are pollinators of M. guianensis. Plants having an extended anthesis can attract visitors both day and night. In this study, we present an example of a crepuscular pollination system. We suggest that blooming at twilight is a strategy used by the plant to escape unsuitable visitors. KEYWORDS: Pollination, insect-plant interaction, floral oil, crepuscular foraging. Um total de 86 indivíduos de seis espécies de abelhas foi registrado visitando as flores com Xylocopa cearensis realizando a maioria das visitas (60%), seguida por Melipona subnitida e Megalopta amoena com 21,17% e 9,41%, respectivamente. Os visitantes mostraram picos de atividade entre 5:00 -6:00 h (66,27%). O comportamento predominante foi o de vibração. Megalopta amoena utilizou suas mandíbulas para romper os poros da antera e glândula. Melipona subnitida utilizou partes das glândulas para a vedação da entrada da colônia. Os visitantes, a exceção de Augochlopsis sp. e Trigona sp., são polinizadores de M. guianensis. Plantas com longos períodos de antese podem atrair visitantes diurnos e noturnos. Aqui demonstramos um exemplo de sistema de polinização crepuscular, sugerindo que o fato florir durante o crepúsculo é uma estratégia da planta para escapar de visitantes inoportunos. PALAVRAS-CHAVE: Polinização, interação inseto-planta, óleo floral, forrageamento crepuscular. Flowering phenology of Mouriri guianensis (Melastomataceae) and its interaction with the crepuscular bee Megalopta amoena (Halictidae) in the restinga of Lençóis Maranhenses National Park, Brazil ACTA Fenologia da floração de

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The pollen spectrum of 120 samples of Melipona (Melikerria) fasciculata Smith 1854 geopropolis from two phytogeographical regions of Maranhão, Brazil was analyzed. This study aimed to characterize the palynologically geopropolis produced by this species of bee. Samples were collected monthly in Palmeirândia (seasonally flooded fields vegetation) and Barreirinhas (''Cerrado'' vegetation). A total of 121 pollen types were identified and distributed into 52 families and 84 genera. The predominant pollen types ([45 %) were Adenocalymma inundatum (Bignoniaceae), Bauhinia reflexa (Caesalpiniaceae), Caryocar (Caryocaraceae), Chamaecrista (Fabaceae), Lafoensia (Lythraceae), Mauritia (Arecaceae), Machaerium (Fabaceae), Mimosa pudica (Mimosaceae), and Ouratea (Ochnaceae). The pollen types Adenocalymma inundatum, Adenocalymma sp.

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