The present work reveals a full description of the neurocranium of the optimum stage of Falco tinnuculus rupicaeliformes (Family Falconidae, Order Falconiformes). The following events were achieved during this stage:
1. The lord sis phenomenon of the previous stages becomes more minimized.
2. The completion of the basicranial fenestra at the anterior edge of the basal plate, by the usual absorption of the pre-existing cartilage.
3. Tectum synoticum is purely of occipital origin (tectum posterius).
4. The ordinary three hypoglossal foramina exist.
5. The same seven prominentiae, characterizing the avian auditory capsule, have been found.
6. The fenestra ovalis is formed by the degeneration of pre-existing cartilage of the internal wall of the prominentia cochlearis.
7. The prefacial nerve passed through the very short foramen.
8. The auditory capsule is connected by a number of commissurae which provide a firm position.
9. Three pores resulted from the partition of the fissure metotica; the fissure exoccipitocapsularis, anterior aperture medialis recessus scalae tympani and a foramen jugulare.
10. The interorbital septum attained a huge height. It persists for a long distance and reaches most of the auditory capsule.
11. Complete disappearing of the anterior orbital cartilage(including the planum supraseptale).
12. The bacg growing of the parietotectal cartilage persists for a very long distance, reaching to the auditory region for a considerable distance.
13. The fenestra septi interorbitalis is completed by the resorption of the pre-existing cartilage in the central part of the interorbital septum.
14. The acrochordal cartilage, posterior orbital cartilage, the pila antotica and the suprapolar cartilage suffered from the resorption process in the pre-existing cartilage.
15. The nasal septum has been perforated by the craniofacial fenestra.
16. The parietotectal cartilage curled ventrally to form the solum nasi, which has a considerable duration.
17. The maxilloturbinal cartilage has two secondary lamellae.
18. The concha nasalis is very much shallow and has a long duration
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