India (DU), Institut royal des Sciences naturelles de Belgique, Brussels, Belgium (IRSNB), University of Kansas, Museum of Natural History, Lawrence, USA (KUH), Museu de Ciências e Tecnologia da PUCRS, Porto Alegre, Brazil (MCP), Muséum national d'Histoire naturelle, Paris, France (MNHN), Museum of Vertebrate Zoology, Berkeley, USA (MVZ), Naturhistorisches Museum, Zoologische Abtheilung, Vienna, Austria (NHMW), National Museum of Sri Lanka, Colombo, Sri Lanka (NMSL), University of Kerala, Thiruvananthapuram, India (UK), University of Michigan Museum of Zoology, Ann Arbor, USA (UMMZ)

Models were decimated in Geomagic Wrap down to approximately 700,000 faces, reducing computational demands for morphometric data collection (detailed below) without compromising detail. Mirroring of models was implemented for specimens whose right-hand side was damaged (*Praslinia cooperi*, *E. bicolor*), using the 'mirror' function in Geomagic Wrap, and subsequent data collectionmaxillary plate: inflection point where bone splits to surround the choana20Nasopremaxilla, palatal surface: lateral extreme of tooth row21Nasopremaxilla, palatal surface: posteromedial extreme22Vomer: medial extreme of tooth row23Vomer: lateral extreme of tooth row24Os basale, ventral surface: medial position on the muscle ridge25Os basale, ventral surface: lateral position on the muscle ridge26Os basale, ventral surface: closest position to vomer27Os basale: dorsal extreme of occipital condyle28Os basale: ventral extreme of occipital condyle29Os basale: posterior extreme of fenestra ovalis30Os basale: lateral extreme along suture with parietal31Squamosal: anteromedial extreme32Squamosal: ventral extreme along suture with maxillopalatine33Squamosal: posteromedial extreme34Squamosal: posteroventral extreme35Frontal: suture with nasal along midline36Frontal: suture with parietal along midline37Frontal: lateral extreme suture with parietal38Parietal: suture with frontal along midline39Parietal: anterolateral position of parietal40Parietal: posterolateral extreme\*41Maxillopalatine, lateral surface: anterior extreme of tooth row (dorsal)42Maxillopalatine,