Psammophiid, pseudoxyrhophiid and sanziniid snakes identified in this study. Sampling localities for each photographed individual are provided. ANP ES – Andringitra National Park Eastern Slopes; ANP WS – Andringitra National Park Western Slopes (Fig. 1; Suppl. material 1: Table S1). A. Compsophis infralineatus from Namoly; B. Leioheterodon modestus from Antanifotsy 1; C. Madagascarophis meridionalis from Anja; D. Thamnosophis lateralis from Anja; E. Pseudoxyrhopus sp. Ca2 from Ambatomainty; F. Liophidium torquatum from Anja G. Mimophis mahfalensis from Sakaviro; H. Sanzinia cf. volontany from Anja; I. Acrantophis dumerili from Sakaviro. Photographs by Javier Lobón-Rovira (A–E, G, I), Gonçalo M. Rosa (F) and Franco Andreone (H).