...The average ratio of thediameter of the tympanum to the diameter of the eye is 76... 
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」
...—Diameter of tympanum 36...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...My old tympanum is not always capable ofperceiving these subtleties of sound...
J. H. Fabre 「The Wonders of Instinct」
...; tympanum/eye,40...
William E. Duellman 「Descriptions of Two Species of Frogs, Genus Ptychohyla」
...; tympanum/eye, 50...
William E. Duellman 「Descriptions of Two Species of Frogs, Genus Ptychohyla」
...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」
...A heavy dermal fold from posteriorcorner of eye above tympanum and curved downward to insertion offorearm; tympanum round, its diameter slightly more than its distancefrom eye...
William E. Duellman 「A Review of the Frogs of the Hyla bistincta Group」
...In Bufo occidentalis the tympanum usually is indistinct andsometimes completely covered, and it is absent in bocourti...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...In adult males, the top and sides of thehead, anterior to the tympanum, are uniformly grayish green orbluish green; the mandibular and maxillary beaks are brighter,yellowish green...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...Ptychohylaignicolor differs from all of the other species in having the headslightly wider than long and the tympanum noticeably less than halfthe size of eye...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...;tympanum/eye, 50...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...Thin dermal fold, fromposterior corner of eye above tympanum to insertion of fore limb, coveringupper edge of tympanum; tympanum nearly round, its diameter equal to itsdistance from eye...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...; thin dermal fold extending posteriorly from posteriorcorner of eye, obscuring upper edge of tympanum, curving downward topoint above insertion of arm...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...1 per cent that of eye, separated from eye by distance equalto diameter of tympanum...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...The onlynoticeable morphological difference between the subspecies, except inthe size of the tympanum, is the shape of the snout...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...; thindermal fold extending from posterior corner of eye to point aboveinsertion of arm; tympanum absent, not visible through skin...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...8 per cent that of eye, separated from eye bydistance equal to half again diameter of tympanum...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
...8 per cent of that of theeye, separated from eye by distance equal to diameter of tympanum...
William E. Duellman 「Descriptions of New Hylid Frogs From Mexico and Central America」
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