Description of six new species of Cyrtodactylus Gray (Squamata: Gekkonidae) from northeastern India

We describe six new species of Cyrtodactylus from the khasiensis group using morphological characteristics, supported by the molecular analyses based on the mitochondrial ND2 gene. We used four different molecular species delimitation analyses that recovered six distinct undescribed lineages distributed across four states in northeastern India. Our phylogenetic analyses using ML and Bayesian approaches recovered a clade where the recently described C. arunachalensis and C. cayuensis align together with our other samples from Arunachal Pradesh, north of Brahmaputra River. Based on these results and overlapping morphological characteristics we synonymize C. arunachalensis with C. cayuensis. We provide updated comparative morphological characters for species in the khasiensis group and where available these characters are tabulated for males and females separately. Including the six new species the khasiensis group now contains 35 species, of which 26 are endemic to India.