. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. 206 Advances in Herpetology and Evolutionary Biology. the principal muscle body M. pectoralis pars humeralis. pect hum DISCUSSION pect cut ext obi abd med Figure 5. Anteroventral view of the superficial trunk and thoracic musculature of Uromastyx acanthinurus (Uromastycidae). Only in this specimen was the M. pectoralis pars cutaneous found to arise from the middle of the body of M. pectoralis pars humeralis, rather than existing as a separate
. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. 206 Advances in Herpetology and Evolutionary Biology. the principal muscle body M. pectoralis pars humeralis. pect hum DISCUSSION pect cut ext obi abd med Figure 5. Anteroventral view of the superficial trunk and thoracic musculature of Uromastyx acanthinurus (Uromastycidae). Only in this specimen was the M. pectoralis pars cutaneous found to arise from the middle of the body of M. pectoralis pars humeralis, rather than existing as a separate slip lateral to the main muscle body. Abbreviations: see Figure 4. Finally, several specimens were dis- sected in order to trace the innervation of the muscle slip in question. The nerve was found to be a branch of a large nerve trunk of the brachial plexus in the axilla, and the large nerve entered the M. pec- toralis, in Leiolepis belliana (ZFMK 13156), Uromastyx ornatus (ZFMK 8576), and Physignathus cocininus (ZFMK 21459). The latter specimen demonstrated best the ramification of the nerve into the muscle. Because the M. rectus abdominis is innervated by tho- racic intercostal and lumbar nerves, in- nervation of this muscle by a branch of the nerve to the M. pectoralis from the bra- chial plexus clearly demonstrates correct homology with the M. pectoralis. I have named this muscle slip simply as the M. pectoralis pars cutaneous in contrast with Camp's (1923) suborders (Autarch- oglossa, M. rec. abd. lateralis present; Ascalabota, M. rec. abd. lateralis absent) have remained relatively unchanged since their establishment (Underwood, 1971) even though the Xantusiidae and Pygopodidae were respectively transfer- red from the Scincomorpha and An- guimorpha to the Gekkota (Kluge 1967, 1976). Recently, the suborder Ascalabota has been challenged as a polyphyletic taxon because of numerous convergent adaptations of the Iguania and Gekkota (Sukhanov 1961, 1976; Northcutt, 1978; Estes
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Keywords: ., bookauthorharvarduniver, bookcentury1900, booksubjectherpetology
