Lists orders of this class with corresponding species.

Presents a timeline of the existence of these organisms. With photos and descriptions.

Discusses the decline and loss of this species. With photos.

Contains information on specimens on sale. With price and ordering guide.

Lists words pertaining to this animal class. With descriptions.

Contains information on this animal class. With list of online resources.

Contains information on these extinct species. With photos.

Contains information on the subgroups of this class. With photos.

Discusses the evolutional history of this animal class. With phylogenic diagram and related references.

Contains an educational resource on this animal class. With illustrations and guides.

Contains a labeled map of areas where these species once existed.

Presents images and information of species that once existed in the region.

Lists subgroups of this class. With data on discoverer and year of discovery.

Contains information on this publication by Judy Lundquist.

Discusses the body divisions of a typical trilobite. With photos.

Contains a labeled image of this organism. With links to related pages.

Discusses habitats during the existence of these species. With photos. .

Discusses the mechanics and purposes of this behavior. With photos and selected references.

Discusses design, variation, types, and evolutionary loss of eyes of this animal group. With photos.

Presents information on this physical feature and its relation to the molting of these species. With photos.

Discusses eating behaviors of these ancient species. With photos.

Contains a labeled illustration of this organism. With links to related pages.

Provides information on morphology, phylogeny, evolution and extinction of this animal class. With links and references.

Lists publications pertaining to this animal class. With fact sheets and order galleries.

Discusses the life cycle and growth of this class. With photos.

Contains information on the mechanics of this process. With photos.

Discusses evolutional history and phylogeny of this group. With references and labeled illustrations.

Presents information on the ancient records of this species. With description on feeding and ichnofossils.

Contains a labeled illustration of this organism. With links to related pages.

Contains information on the edibility of these species. With photos.

Provides information on collected records. With description and places of discovery.

Provides information on fossil items for sale. With pricing guide.

Provides information on body plan, evolutional history and phylogeny of this class. With labeled illustrations.

Contains images and information on the species which yielded these features.