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Keywords from Image Description:
Origin of Vertebrates Fig . Fig Ventral half of Headregion of Ammoctes Somatic muscles coloured red Branchial and visceral muscles coloured blue Tubular constrictor muscles distinguished from striated constrictor muscles by simple hatching Tent tentacles Tent mucocartilage of tentacles Vel mucocartilage of the velum Hy mucocartilage