List of Characters

Character name character states 1. Suture between left and right frontal bones 0 smooth (harmonic suture) 1 serrated 2. Anterior margin of frontal 0 narrower than posterior margin 1 of similar width or slightly wider than posterior margin 3. Shape of nasal bones 0 flat, approximately rectangular 1 flat, triangular 2 tubular but straight 3 tubular and strongly curved 4. Relationship between left and right nasal bones 0 in contact along the midline 1 separated 5. Supraoccipital bone 0 absent 1 present 6. Supraoccipital crest 0 absent or poorly developed 1 well-developed, spine-like supraoccipital crest 2 well-developed, high and triangular supraoccipital crest 3 hypertrophied, forming a pectinate blade 7. Condition of skull roof 0 medioparietal 1 lateroparietal 8. Relative shape of the extraescapular bone/s 0 quadrangular or semicircular not expanded caudally 1 tubular shape 2 approximately triangular, expanded caudally 3 expanded rostrally 9. Recessus lateralis 0 absent 1 present 10. Ossified bulla in the prootic bone 0 absent 1 present 11. Posttemporal fossa 0 absent 1 present and separated from the fossa Bridgei 2 present and confluent with the fossa Bridgei 12. Bones participating in the posttemporal fossa 0 epiotic, pterotic and exoccipital 1 epiotic, pterotic, exoccipital and intercalar 2 epiotic, pterotic and parietal 13. Position of the foramen for the glossopharyngeal nerve 0 in the prootic bone 1 in the exoccipital bone 2 in the basioccipital bone 14. Position of the foramen for the vagus nerve 0 between the intercalar and exoccipital bones 1 in exoccipital bone 2 in the basioccipital 3 between the intercalar and basioccipital bones 15. Foramina in basioccipital for occipital or spinal arteries 0 present 1 absent 16. Trajectory of the dorsal aorta in relation to the basioccipital 0 passing through an ossified canal formed by the basioccipital 1 passing through a median groove in the basioccipital 2 canal or groove in the surface of the basioccipital bone absent 17. Posterior myodome 0 extending in basioccipital 1 not extending into basioccipital because it is confined to the prootics 2 absent 18. Ethmopalatine ossifications 0 absent 1 present 19. Proethmoid ossifications 0 absent 1 present 20. Independent dermopalatine(s) bone(s) 0 present 1 absent 21. Autopalatine bone 0 ossifies late in ontogeny 1 ossifies early in ontogeny 2 autopalatine bone absent 22. Vomer 0 paired