Figure 1 in Diversity and evolution of sexually dimorphic mental and lateral glands in Cophomantini treefrogs (Anura: Hylidae: Hylinae)

Figure 1. The mental region in preserved male specimens of some species of Cophomantini. A, Hypsiboas pulchellus. B, Hypsiboas albomarginatus. C, Hypsiboas faber. D, Hyloscirtus caucanus. E, Aplastodiscus periviridis. F, Hypsiboas pombali. G, Hyloscirtus palmeri. H, Hyloscirtus colymba. A, B, mental region in species lacking sexually dimorphic skin glands (SDSGs). C, D, mental region in species in which SDSGs are discernible only after histological analysis. Note that, in A–D, variation in the colour and structure of the skin is independent of the occurrence of SDSGs. E, F, the mental gland is distinguished by a yellowish or brownish colour, with individual glands observed under magnification. G, H, the gland protrudes from surrounding skin, which becomes evident by a ridge around it. Arrowheads indicate the limits of the glandular area, which is approximate in (C) and (D). Scale bars = 5 mm. (Colour version of figure available online.)