The expanded and hardened base of the appendage of many arthropods, notably trilobites, crustaceans, and marine cheliceramorphs. Used to macerate food items before ingestion. Found on http://www.ucmp.berkeley.edu/glossary/gloss7metazoa.html
The expanded and hardened base of the appendage of many arthropods, notably trilobites, crustaceans, and marine cheliceramorphs. Used to macerate food items before ingestion. Found on http://www.ucmp.berkeley.edu/glossary/glossary_7.html