...It is not possibleto determine when the genus evolved, but to explain the differentiation ofthe species it is unnecessary to have the ancestral Smilisca present prior to theMiocene... 
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Local differentiation in the pocket gopher (Geomys personatus) insouthern Texas...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...longirostris seem to me to be of thesame magnitude and indicate a similar period of differentiation froma common ancestor...
James S. Findley 「Speciation of the Wandering Shrew」
...Shifts of geographical range of populations of pygmy miceat and near the periphery of their geographic range may accountfor the differentiation of the extinct species...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...The amount of differentiation in isolated populations of amphibians insouthern México and northern Central America gives some idea ofrelative lengths of time of isolation from related populations...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...The differentiation and dispersal ofelaeochroaandstaufferitook place in Central America after the Pliocene...
Juan R. León 「The Systematics of the Frogs of the Hyla Rubra Group in Middle America」
...The effect, then, of this earliest histological differentiation was to producetwo different kinds of cells—nutritive cells in the depression andlocomotive cells on the surface outside...
Ernst Haeckel 「The Evolution of Man」
...On closer examination wefind here also a small vesicular swelling at the fore end of the tube, thefirst trace of a differentiation of it into brain and spinal cord...
Ernst Haeckel 「The Evolution of Man」
...It isprobable that this differentiation was more advanced in the extinctProvertebrates, and the brain-bulb more pronounced (Figs...
Ernst Haeckel 「The Evolution of Man」
...The mass and weight of the brain are much greater in modernmammals, and the differentiation of its various parts more important, than intheir extinct Tertiary ancestors...
Ernst Haeckel 「The Evolution of Man」
...This process was the differentiation of the gut into twosections—an anterior respiratory section, the branchial gut, that wasrestricted to breathing, and a posterior digestive section, the hepatic gut...
Ernst Haeckel 「The Evolution of Man」
...The origin of the Müllerian duct is still obscure; comparative anatomyand ontogeny seem to indicate that it originates by differentiation from theWolffian duct...
Ernst Haeckel 「The Evolution of Man」
...Perhaps it would be best to say: “The original primarynephroduct divides by differentiation (or longitudinal cleavage) into twosecondary nephroducts, the Wolffian and the Müllerian ducts...
Ernst Haeckel 「The Evolution of Man」
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