Western Trilobites Association

TRILOBITE SYSTEMATICS
 
Trilobite Taxonomy
Trilobite Phylogeny
 
Phylum Arthropoda
Subphylum Chelicerata
or Subphylum Trilobitamorph
Superclass Arachnomorpha *
Class Trilobita

    Order Agnostida
    Order Redlichiida
    Order Corynexochida
    Order Phacopida
    Order Lichida
    Order Proetida
    Order Harpetida
    Order Ptychopariida
    Order Asaphida
    Order Odontopleurida **
    Order Nectaspida
 
o Arthropoda
`--o Trilobita
   |?-Agnostida
   |?-Eodiscina
   `--+--o Redlichiida
      |  |--Olenellina
      |  `--Redlichiina
      |--Corynexochida
      |--Phacopida
      |--Lichida
      |--Odontopleurida
      `--o Librostoma
         |--Proetida
         |--Harpetida
         |--Ptychopariida
         `--Asaphida
* Several alternative taxonomies are found in past and current literature. For example, trilobites are sometimes found placed in arthropoda subphylum Schizoramia within Superclass Arachnomorpha.
** Some authors argue that a separate Order Odontopleurida should be separated from Order Lichida, but the concention is not followed here pending settlement of the science.

 

Western Trilobites Association:
Trilobite Genera / Species I Trilobite Formations I Trilobite Locations