Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2018 Dec 26;4:32. doi: 10.1186/s40851-018-0114-y

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s). 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

PMC Copyright notice

Fig. 1 — Subphylum Vertebrata of the phylum Chordata. a Key reports that led to the concept of the phylum Chordata. Terms in red are of phylum rank and those in black are of subphylum rank. Those in green were recognized as invertebrates at the times indicated in the first column. b Traditional view (upper) and c our proposed view (lower) of chordate phylogeny with respect to inter-phylum relationships. The proposed phylogeny regards the Cephalochordata, the Urochordata, and the Vertebrata as separate phyla, rather than as subphyla. (modified from [17])