| 21. | One of these is a large triangular antorbital fenestra in the side of the snout.
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| 22. | The antorbital fenestra houses a paranasal sinus that is confluent with the adjacent nasal capsule.
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| 23. | Like many other basal parareptiles, " Microleter " has a temporal fenestra.
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| 24. | Synapsids have a single hole ( temporal fenestra ) low on each side of the skull.
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| 25. | In the lower jaw, the external mandibular fenestra is rather small for a basal tetanuran.
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| 26. | The external mandibular fenestra is large.
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| 27. | The mandibular fenestra was large and was located at the front part of the lower jaw.
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| 28. | The external mandibular fenestra, present in prosauropods and some basal sauropods, is entirely closed.
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| 29. | The teeth are located entirely anterior to the antorbital fenestra and the snout is especially broad.
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| 30. | The subsquamosal fenestra, an opening in the posterior part of the skull, is relatively small.
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