A SYSTEMATIC STUDY OF THE MAIN ARTERIES IN THE REGION OF THE HEART—AVES XI.: TINAMIFORMES—WITH SOME NOTES ON THEIR APPARENT RELATIONSHIP WITH THE GALLIFORMES

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Abstract
Five species of tinamous were dissected and diagrams of the arteries in the neck and thorax prepared. All species were bicarotidinae normales, and each presented both a right ligamentum botalli as well as a ligamentum aortae. An arteria pericardia was present in one species. Similarities and dissimilarities in structure of the tinamous and gallinaceous birds are discussed with reference to possible phylogenetic relationships. Considerable similarity in arrangement-patterns of these two orders of birds exists and may be based upon structural characteristics of common origin, rather than upon an instance of parallel development. Tinamous may have a more recent origin from the ancestral form than their apparent relatives the Galliformes.

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