Snake species from the Pernambuco Endemism Center. A Tantilla melanocephala B Apostolepis cearensis C Apostolepis longicaudata D Atractus maculatus E Atractus potschi F Boiruna sertaneja G Caaeteboia sp. H Dipsas mikanii I Dipsas neuwiedi J Dipsas sazimai K Dipsas variegata L Erythrolamprus aesculapii M Erythrolamprus almadensis N Erythrolamprus poecilogyrus O Erythrolamprus reginae. Photograph credits: Frederico França (A, B, G, H, I), Anderson A. Santos (C, N), Rafaela França (D, E, J, K, L, M, O), Paulo R. S. Freitas (F).