Esse estudo é o primeiro a caracterizar os principais centros circadianos do STC do morcego Artibeus planirostris, um quiróptero endêmico da América do Sul. Nossos resultados descrevem a citoarquitertura, o padrão de inervação retiniana e o conteúdo neuroquímico desses centros. Este trabalho representa um instrumento fundamental para estabelecer o referido morcego como modelo experimental envolvendo o sistema nervoso. Adicionalmente, os resultados aqui discutidos oferecem a possibilidade de compreender os aspectos filogenéticos dos quirópteros e do próprio STC. Quanto à alocação temporal das espécies, nenhuma relação aparente foi encontrada entre o padrão das aferências retinianas e o conteúdo neuroquímico do NSQ e FIG. Nesse sentido, a determinação do nicho temporal entre animais diurnos, crepusculares e noturnos ainda não foram totalmente esclarecida. Estudos neuroquímicos e cronobiológicos devem ser realizados com o intuito de elucidar o verdadeiro papel da organização anatômica no controle da ritmicidade biológica.
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