. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. Description of Phrynops williamsi ? Rhodin and Mittermeier 63. Figure 3. Ventral and lateral views of head and neck of MCZ 64135, the holotype of P. williamsi. Ventral photograph slightly retouched to obscure small lacera- tion present on specimen itself. third to one half of the tympanum, and then along the mid-lateral surface of the neck, gradually fading caudally. The lowermost band forms a posteriorly di- rected horseshoe-shaped figure on
. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. Description of Phrynops williamsi ? Rhodin and Mittermeier 63. Figure 3. Ventral and lateral views of head and neck of MCZ 64135, the holotype of P. williamsi. Ventral photograph slightly retouched to obscure small lacera- tion present on specimen itself. third to one half of the tympanum, and then along the mid-lateral surface of the neck, gradually fading caudally. The lowermost band forms a posteriorly di- rected horseshoe-shaped figure on the ventral chin, extending anteriorly to the base of the barbels, usually sharply dis- continuous posteriorly, with an interrup- tion at the level of the posterior border of the tympanum, before continuing for a short distance as short subparallel bands or elongate spots. The intermediate band extends caudally from the angle of the jaws, serving as a continuation of thin bands of dark pigment on the external tomial surfaces of the inferior portion of the maxillary and superior portion of the mandibular homy sheaths. The band then continues along the inferior border of the tympanic membrane and ventro- laterally along the neck, ending abruptly at approximately the same level as the last band or spot in the lowermost band. These three broad bands are usually totally separate from one another. Of seven specimens examined (including specimens figured in the literature), none had a connection between the upper and intermediate bands. Three out of seven specimens had very thin connections between the lower and intermediate bands posterior to the tympanum, two of them only unilateral and one with thin bilateral connections. One out of seven specimens had a discontinuous ventral horseshoe, narrowly lacking midline con- tact under the chin. The dorsal head pat- tern is relatively indistinct, composed of a dark background with narrow indistinct lighter lines subparallel to the uppermost
Size: 1369px × 1825px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorharvarduniver, bookcentury1900, booksubjectherpetology
