vocal sac


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vocal sac

[′vō·kəl ‚sak]
(vertebrate zoology)
An expansible pocket of skin beneath the chin or behind the jaws of certain frogs; may be inflated to a great volume and serves as a resonator.
References in periodicals archive ?
7 % eye length; one or two nonconical postrictal tubercles posteroventral to tympanic annulus; choanae round, not concealed by palatal shelf of maxillary arch; vomerine odontophores median and posterior to choanae, separated medially by distance 1 1/2 times width of an odontophore, each about size of a choanae, each bearing 1-3 teeth (mode 3) arranged in transverse row; odontophores slanted in smaller specimens, subtriangular in adults; tongue longer than wide, not notched posteriorly, posterior 1/4 not adherent to floor of mouth; vocal slits posterolateral to tongue, long; vocal sac subgular, median.
The Phylogenetic significante of vocal sac structure in hylid frogs.
Osteocephalus, as recognized by Goin (1966) and Trueb & Duellman (1971), was a genus defined in part by the presence of lateral vocal sacs, and thus related to Phrynohyas and Trachycephalus.
Male with poorly developed vocal sac that extends as a tube of thin muscle and fascia from the throat to the area behind and slightly above the angle of the jaw, where it is more muscular.
The vocal sac of lindsayi tends to be bilobed but it is single.
For the diagnoses, the following numbered elements do not exhibit variation: (1) skin of venter areolate or granular; no dorsolateral folds; (4) upper eyelid broader than IOD, no cranial crests; (6) males with large subgular vocal sac, no nuptial pads; (7) first finger shorter than second; (9) no ulnar tubercles; (10) no tubercles or folds on heel or tarsus; (11) no supernumerary plantar tubercles; (12) fifth toe much longer than third.
When calling from floating objects, their inflated vocal sac was not in contact with water.
The researchers found that male frogs that have found suitable spots for spawning in sections of the reed bamboo will call out for female mates using the vocal sacs in their throats.
The body length is about 50-60 mm from snout to vent; throat is smooth; vocal sacs are light brown; male has vocal slits under the lower jaw; dorsal side of the body is light grey, olive green or light brown, some times black with numerous scattered small smooth tubercles and irregular black spots; ventrum is white and smooth, immaculate or with dark speckling or reticulation (Khan and Tasnim, 1989).
Phrynohyas is one of four genera in the family Hylidae having paired lateral vocal sacs.
Also, Feng says, video analysis suggests that a double set of vocal sacs contributes to the animals' virtuosity.
Purgue uncovered the ear phenomenon while investigating a long-standing puzzle about vocal sacs in frogs and toads.