The labium is not developed from a pair of tubercles, as is usual, but at once appears as an unpaired, or single organ. [Please select]
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Posteriorly the skull consists of four bones: an unpaired median dorsal supraoccipital, an unpaired median ventral basioccipital and two lateral exoccipitals. [Please select]
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Both subspecies of _Hyla microcephala_ have a long, unpaired primary note followed by 0 to 18 (usually about 4) somewhat shorter paired secondary notes. [Please select]
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_Hyla robertmertensi_ has a reverse of this pattern in that the primary note is paired and the secondaries are unpaired. [Please select]
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The Stumpys of this world must be resigned to go unpaired. [Please select]
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The sphenethmoid region was certainly not a large, unpaired unit as in the Diplocercines. [Please select]
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