Fig. 10

Summary of the results of this study and comparisons to adult structures of other squamates and Sphenodon. *This condition occurs in both, Gekkota and Iguania [24]. ** In Gekkota the lacrimal duct is connected to the choanal groove and the medial wall of the duct of the vomeronasal organ simultaneously. Moreover, the choanal groove in adults geckoes is not vestigial [24]. *** In some species of Scolecophidia the vomeronasal nerve enters the organ through a vertical foramen in the septomaxilla [42, 43]. Silhouettes in the legend (except Henophidia) from http://phylopic.org/. Silhouettes of the grass snake embryo in the timeline from Rupik [59]. In some cases the beginning and the end of the stage are separated by the dashed line. Abbreviations: CH choana, CHG choanal groove, CHNG Choanengang, CJ cupola Jacobsoni, MB mushroom body, LD lacrimal duct, L1 basal layer, L2 central layer, L3 peripheral layer, NSD no significant differences, SMX septomaxilla, VCH ventral channel, VOM vomer, VNN vomeronasal nerve, VNO vomeronasal nerve