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Pelecanus occidentalis FMNH 342303 (A), Phaethon aethereus FMNH 348136 (B), Sula sula FMNH 339372 (C), Fregata magnificens FMNH 339418 (D), and Limnofregata azygosternon FMNH PA755 (D, E). Scale bars equal 10 mm. Abbreviations: dtr, dorsal tympanic recess; md, mandible; pa, palatine; para, paroccipital process; pil, pila otica; pt, pterygoid; orc, orbital ( = squamosal) cotyle; otc, otic cotyle; q, quadrate; quad/jug, quadratojugal/jugal.
