DescriptionPhylogeny gill slit.png English: A phylogeny showing when gill slits may have arisen. It is thought that gill slits were subsequently lost...
This image is a derivative work of the following images: File:Phylogeny_gill_slit.png licensed with PD-self 2010-09-07T02:52:06Z Comu nacho 782x546 (38921...
