...The four are here afforded species rank since morphological similarityand allopatry are not sufficient grounds for the assumption of geneticexchange... 
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...There are relatively few clear-cut morphological differences among thefourteen species now assigned to Syrrhophus...
John D. Lynch 「A Taxonomic Revision of the Leptodactylid Frog Genus Syrrhophus Cope」
...Our small samples of birds and reptiles from the island show nodetectable morphological differentiation from adjacent populations...
Robert K Selander 「Vertebrates from the Barrier Island of Tamaulipas, México」
...It was then found to be completelychanged in its morphological characters, the rods being elongated, slender,more or less beaded, and entirely of the human type...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...pacificus, and in addition the morphological differentiation was notso great...
James S. Findley 「Speciation of the Wandering Shrew」
...The combination of morphological and behavioral charactersin the living pygmy mice warrants generic status for them...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...nelsoni(Tepic, Nayarit—known from a single adult male) are closely related but areconsidered distinct because of their morphological differences and widelyseparated known ranges...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...Each of the external morphological characters used in the systematictreatment of Ptychohyla, as well as the nature of the tongue,is discussed below...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...—Five species, two of which are made up of two subspecies,arranged in two groups of species on the basis of morphological characters ofadults and tadpoles and on the basis of breeding calls...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...The most obvious morphological difference isthat the head is noticeably narrower in H...
William E. Duellman 「Middle American Frogs of the Hyla microcephala Group」
...Taylor (1938:421) and Smith and Taylor (1948:78) excludedstaufferifrom theeximiagroup on the basis of morphological characteristics...
Juan R. León 「The Systematics of the Frogs of the Hyla Rubra Group in Middle America」
...The distinctive combination of morphological, physiological,chromosomal, and behavioral characteristics is strongly suggestive thatthese frogs represent an early phyletic divergence within the Hylidae...
William E. Duellman 「The Genera of Phyllomedusine Frogs (Anura Hylidae)」
...These morphological studies ledGoethe on to research into the formation and modification of organic structureswhich we must count as the first germ of the science of evolution...
Ernst Haeckel 「The Evolution of Man」
...The proof of it lies in the whole morphological literature of thelast three decades...
Ernst Haeckel 「The Evolution of Man」
...These morphological facts are in perfect harmony with the familiarphysiological truth that the child inherits from both parents, and that on theaverage they are equally distributed...
Ernst Haeckel 「The Evolution of Man」
...We must look to morphological characters...
Ernst Haeckel 「The Evolution of Man」
...The whole of the resultsof recent morphological research compel us irresistiblyto recognise the biogenetic law and its far-reaching consequences...
Ernst Haeckel 「The Evolution of Man」
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