...Below the auditory canal is situated a round prominence,highly developed in carnivora; this is the tympanic bulla,also called the mastoid protuberance; it is an appendage ofthe tympanum... 
Édouard Cuyer 「Artistic Anatomy of Animals」
...The sense of hearing is extremelyacute, and the tympanum is large, although externally there is noaural development...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Snout-vent length, length of the tibia in relationto snout-vent length, and relative size of the tympanum to the eye are the onlymeasurements and proportions that vary noticeably (Table 1)...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...The only other character showing noticeablegeographic variation is the size of the tympanum...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Also, specimensfrom Heredia Province, Costa Rica, have a relatively smaller tympanum (62...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Minor ontogenetic changes in structure involve the shape of the snout,relative size of the eye, development of the tympanum, and amount of webbingin the hand...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Of thevarious measurements and proportions, the snout-vent length andthe relative size of the tympanum to the eye apparently are of moretaxonomic importance than the others (Table 1)...
William E. Duellman 「A Review of the Frogs of the Hyla bistincta Group」
...In some individuals thesupratympanic fold covers the upper part of the tympanum, but at leastthe lower part of the tympanum is always visible...
William E. Duellman 「A Review of the Frogs of the Hyla bistincta Group」
...; tympanum/eye, 52...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...—Diameter of tympanum more than half of diameter of eye;internarial region depressed; toes three-fourths webbed; no red flash-colors onthighs...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...;tympanum/eye, 52...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...Thin dermal fold from posterior corner of eye above tympanum toinsertion of forelimb, covering upper edge of tympanum; tympanum round,its diameter equal to its distance from eye...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...The two subspecies exhibit few differences in size and proportions,except that the tympanum is larger in pseudopuma (Table 1)...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...—Hyla pellita differs from all knownMiddle American Hyla, except mixe, mixomaculata,nubicola, and pinorum, by having a concealed tympanum...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...In neither sex do theaverage proportions differ noticeably from those of the holotype, exceptthat the tympanum is relatively larger in females...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...The ratio of thediameter of the tympanum to that of the eye is 0...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
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