FIGURE 1. A–C in Taxonomic status of the enigmatic salamander Cryptotriton adelos (Amphibia: Plethodontidae) from northern Oaxaca, Mexico, with observations on its skull and postcranial skeleton

FIGURE 1. A–C: Three-dimensional reconstructions of X-ray CT scans of the anterior skeleton and skull of MVZ 208582, an adult male Thorius adelos, seen in ventral, dorsal and lateral views, respectively (www.digimorph.org/ specimens/Thorius_adelos). D: Three-dimensional reconstruction of X-ray CT scan of the skull of MVZ 162257, an adult female T. narisovalis; lateral view (www.digimorph.org/specimens/Thorius_narisovalis). Maxillary teeth are present in T. adelos but absent in T. narisovalis. Abbreviations: AP, ascending processes of the premaxilla; CP, columnar process on the squamosal; DE, dentary; FR, frontal; HU, ossified condyle on the humerus; MC, unmineralized mesopodial (carpal) cartilages; MX, maxilla; NA, nasal; PA, parietal; VE, anterior condyle on second trunk vertebra. Arrow: septomaxilla (right side only); arrowheads: dorsal fontanelle. Scale bar, 1 mm.