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Keywords from Image Description:
PZSLPage. plate for distribution of phenotypes among bird taxa br Isocoelousbr Anticoelousbr AntiPericoelousbr IsoPericoelousbr Cyclocoelousbr Plagiocoelousbr Telogyrousbr Descending branches marked by solid ascending branches by dashed lines Roman numbers denote intestinal loops Proceedings of the Zoological Society of London org