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Cope's gray tree frog
Cope's gray tree frog〔(''Hyla chrysoscelis'' ), Amphibian Species of the World 5.6〕 (''Hyla chrysoscelis'', also called the southern gray tree frog) is a species of tree frog found in the United States. It is almost indistinguishable from the gray tree frog, ''Hyla versicolor'', and shares much of its geographic range. Both species are variable in color, mottled gray to gray-green, resembling the bark of trees. These are tree frogs of woodland habitats, though they will sometimes travel into more open areas to reach a breeding pond. The only readily noticeable difference between the two species is the call — Cope's has a faster-paced and slightly higher-pitched call than ''H. versicolor''. In addition, ''H. chrysoscelis'' is reported to be slightly smaller, more arboreal, and more tolerant of dry conditions than ''H. versicolor''.〔Martof, B. S., et al. (1980). ''Amphibians and Reptiles of the Carolinas and Virginia''. Chapel Hill: University of North Carolina Press. ISBN 0-8078-4252-4.〕
==Taxonomy==
Edward Drinker Cope described the species in 1880. The specific name ''chrysoscelis'' is from Greek ''chrysos'', gold, and ''scelis'', leg.〔(Family Group Names in Diptera )〕
Microscopic inspection of the chromosomes of ''H. chrysoscelis'' and ''H. versicolor'' reveals differences in chromosome number. ''H. chrysoscelis'' is diploid, having two complete sets of chromosomes, the usual condition in vertebrates. ''H. versicolor'' is tetraploid, having double the usual number of chromosomes. Generally, ''H. versicolor'' is believed to have evolved from ''H. chrysoscelis'' in the last major ice age, when areas of extremely low temperatures divided populations. Despite currently sharing habitat, the two species generally do not interbreed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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