An official website of the United States government
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.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
A map of the characters of the apical plate and intercalary sclerites (marked with various colors) indicates the common or individual characters for particular taxa. SA: synapomorphy, AA: autapomorphy, PS: plesiomorphy, RW: reverse, CO: convergence.