Figure 3 in REVIEW Evolution of macroglands and defensive mechanisms in Leiuperinae (Anura: Leptodactylidae)

Figure 3. General features of skin of selected species. A, lumbar skin of Crossodactylodes itambe, showing type III serous glands (arrowhead). Masson–Goldner trichrome stain (M&G). Scale bar: 20 µm. B, lumbar skin of Physalaemus nanus, showing ordinary mucous glands (OMG) and type Ib serous gland (star) with its neck and duct (arrowhead). M&G. Scale bar: 20 µm. C, lumbar skin of Physalaemus erythros, showing the arrangement of type Ib serous glands (star), with their acini separated by connective tissue, with irregular profiles. Ordinary mucous glands are also indicated (arrows). M&G. Scale bar: 100 µm.