. Bulletin - United States National Museum. Science. 198 BULLETIN" 15 4, UISriTED STATES NATIONAL MUSEUM Affinities.—Because of its characters, geographical position and plasticit^y, tesscUatus is obviously the stem-form of its group. For reasons to be presented in the general summary at the end of this Avork (pp. 251-260), it is thought to have been descended (either directly or through maxiinus) from gularis of the sexUneatus group from which its color pattern may ;e logically and simply derived, and with which it agrees in all fundamentals of scutellation, except- ing for a notabl
. Bulletin - United States National Museum. Science. 198 BULLETIN" 15 4, UISriTED STATES NATIONAL MUSEUM Affinities.—Because of its characters, geographical position and plasticit^y, tesscUatus is obviously the stem-form of its group. For reasons to be presented in the general summary at the end of this Avork (pp. 251-260), it is thought to have been descended (either directly or through maxiinus) from gularis of the sexUneatus group from which its color pattern may ;e logically and simply derived, and with which it agrees in all fundamentals of scutellation, except- ing for a notable decrease in the average size of the post-antebra- chials. In scutellation it is " almost identical with serdineatus,''^ as stated by Brown (1903, p. 547), but its coloration suggests only certain phrases of gularis. In this respect, just why Ellis and Henderson rubidus airt\[r\i. c-gm-us •t^&sellail-us mB^xiTrwAS Ancestral Stock of tV»e TesseUalxis Groxip FlGUUE L'S. -ItlAGUAH OF THE SUW'OSED UlCLATIONSIIirS OF C. TESSET-LATUS TESSELLATUS (1913. ]>. 77) sliould have written that " The young tessellated lizard is marked much like the adult sexUneatus " is not apparent. Strecker (1908, p. 169) has correctly reported that the sides of an adult male of gularis may present a barred and mottled appearance as seen in some examples of tessellatus. This is at once evident to those work- ing with series from various localities, particularly from western Texas and Chihuahua. The large maximus is apparently not closely related to the modern tessellatus. It is probable that both forms represent a common stock and that they were differentiated before the birth of any of the other known forms of the group. At the southern part of its range in Lower California, tessellatus seems to have ver}^ recently given rise to ruhidus with which it now intergrades. In the Gulf of California, tlie insular subspecies, martyris and canus, have become distinguish- able on very sli
Size: 3069px × 814px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
