: Thoracic and Coracoid Arteries In Two Families of Birds Columbidae and Hirundinidae by Jenkinson Marion Anne - Birds Anatomy; Arteries; Swallows Anatomy; Columbidae Anatomy Animal; Animals-Wild-Birds

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INTRODUCTION 555

METHODS AND MATERIALS 556

MYOLOGY AND ANGIOLOGY: HIRUNDINIDAE 557 Myology 557 Angiology 558

MYOLOGY AND ANGIOLOGY: COLUMBIDAE 560 Myology 560 Angiology 560

SUMMARY OF ARTERIAL ARRANGEMENT 562

DISCUSSION AND CONCLUSIONS 562 Individual Variation 562 Intrafamilial Differences 563 Interfamilial Differences 565

SUMMARY 567

LITERATURE CITED 573

INTRODUCTION

Most descriptions of the circulatory system of birds, largely the work of Glenny, have dealt with arteries of the neck and thorax in a wide variety of species. As a result of his work, Glenny offered several hypotheses concerning the phylogenetic, hence taxonomic, significance of differences in some of these vessels. He also described six types of thoracic arterial arrangements and stated that these categories might represent various levels of evolution .

The families Columbidae and Hirundinidae have two nearly extreme arterial types described by Glenny, and are universally acknowledged as monophyletic. Differences within the families, therefore, can be considered as valid intrafamilial differences. I have investigated the thoracic and coracoid arteries and their branches in members of these two families to determine the degree of individual variability of the vessels, and the possible causes of interspecific and intrafamilial differences.

METHODS AND MATERIALS

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