_--Sphenethmoid region partly ossified, and consisting of basisphenoid, parasphenoid, and ethmoid ossifications; paired basipterygoid process and paired antotic process on basisphenoid; parasphenoid of normal size, and closely associated with, or fused to, basisphenoid; ethmoids paired in _Rhabdoderma_ (unknown in _Synaptotylus_). [Please select]
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_Synaptotylus_ is more closely related to _Rhabdoderma_ than to the Diplocercines because the anterior portion of the endocranium contains only a basisphenoid, parasphenoid, and probably ethmoids. [Please select]
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All of the species in the _Hyla uranochroa_ group have large frontoparietal fontanelles, rather small ethmoids, and small nasals that are not in contact with one another or with the ethmoid. [Please select]
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