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.
Diversity of durophagous tooth morphologies. (a) Placochelys placodonta † MB.R. 1765, (b) Dracaena sp. (lizard), (c) Rhina (guitarfish), (d) Anarrhichthys ocellatus (wolf eel), (e) Rhinoptera bonasus (stingray), (f) Acantholithodes hispidus (hairy crab), (g) Pugettia gracilis (graceful kelp crab), (h) Metacarcinus magister (Dungeness crab). (Online version in colour.)
