Figure 1.
Numbers of collections (fossil localities) and occurrences of beetles. Total numbers of collections (red, upper line) and occurrences (yellow, lower line) within 25 Myr intervals. (Online version in colour.)
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.