مفصليات ثلاثية الفصوص: الفرق بين النسختين

| fossil_range = {{fossil range|530|251.4}}[[الكمبري|الكمبري المبكر]] - [[البرمي|البرمي المتأخر]]

| classis_authority = [[Johann Ernst Immanuel Walch|Walch]], 1771<ref name=Kihm&St.John07>{{Citation |author1= Robert Kihm | author2=James St. John |contribution=Walch’s trilobite research — A translation of his 1771 trilobite chapter |editor = Donald G. Mikulic, Ed Landing and Joanne Kluessendorf (Eds) |title= Fabulous fossils - 300 years of worldwide research on trilobites - ''New York State Museum Bulletin'' '''507''' |pages=115-40 |publisher=University of the State of New York |place= |year = 2007 | url = http://www1.newark.ohio-state.edu/Professional/OSU/Faculty/jstjohn/Kihm-and-St.John-2007.pdf}}</ref>

* [[Agnostida]]

* [[Nectaspida]]