Trilobites Site Map

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Trilobita Classification: All trilobite orders on one searchable page.

The Nine Orders of Arthropod Class Trilobita and Nectaspida, the so-called soft bodied trilobites:
Agnostid Trilobites Redlichiid Trilobites Corynexochida Trilobites Phacopid Trilobites Lichid Trilobites Odontopleurid Trilobites Proetid Trilobites Harpetid Trilobites Ptychopariid Trilobites Asaphid Trilobites Nectaspida  Soft Bodied Trilobites

Topics Related to Trilobite Evolution:

Trilobite Evolution Trilobites & Geologic Time Origins Diversity Punctuated Equilibrium Trilobite Families Across Paleozoic Time Trilobites and Extinction Events Stealth and Defense Trilobite Relatives Trilobite Paleogeography

Topics Related to Trilobite Morphology, Body Plan, Phenotypic Traits and Development:

Trilobite Body Plan and Morphology Trilobite Eyes Trilobite Exoskeletons Trilobites Development and Ontogeny

Trilobite Behavior and Lifestyles:

Trilobite Reproduction & Development Molting Trilobite Lifestyles

Trilobite Fossil Taphonomy and Preservation

Trilobite Soft Tissue Preservation

Trilobite Educational Resources:

Trilobites Teaching and Educational Resources Trilobite Terminology

Trilobite Taxonomy
Trilobite Phylogeny
Phylum Arthropoda
Subphylum Chelicerata
or Subphylum Trilobitamorph
Superclass Arachnomorpha (1)
Class Trilobita

    Order Agnostida
    Order Redlichiida
    Order Corynexochida
    Order Phacopida
    Order Lichida
    Order Odontopleurida (2)
    Order Proetida
    Order Harpetida
    Order Ptychopariida
    Order Asaphida
    Order Nectaspida
o Arthropoda
`--o Trilobita
   `--+--o Redlichiida
      |  |--Olenellina
      |  `--Redlichiina
      `--o Librostoma
(1) Several alternative taxonomies are found in past and current literature. For example, trilobites are sometimes found placed in Arthropoda Subphylum Schizoramia within Superclass Arachnomorpha.
(2) Some authors argue that a new Order Odontopleurida should be separated (erected) from Order Lichida, and it appears such a revision will be eventually sustained.