menu

Arthropods: Trilobites

An Illustration by Mary Williams of a Silurian Busmatus trilobite based on specimens of Bumastus chicagoensis and other closely related species from the Chicago area.
An Illustration by Mary Williams of a Silurian Busmatus trilobite based on specimens of Bumastus chicagoensis and other closely related species from the Chicago area.

TRILOBITES are an extinct group of arthropods and possessed a head, thorax and tail. Exceptionally-preserved trilobites also show legs and antennae. Isopods, commonly known as sowbugs or pillbugs, are a modern arthropod that resembles trilobites in many ways. All trilobites lived in seawater. Most were crawlers upon the seafloor, and some could also swim through the water or burrow into sediment. Since trilobites are extinct, interpretation of their feeding habits is difficult. Many may have been scavengers of dead organisms, and some may have been predators, grazers, or filter-feeders. | At least 19 species of trilobites lived as dwellers in the Silurian reefs of Wisconsin. Four of these species, shown above, are present in the diorama.

Kingdom: Animalia
Phylum: Arthropoda

Class: Order: Family: Genus and species

Trilobita: Corynexochida: Styginidae: Bumastus armatus (Hall)
Trilobita: Corynexochida: Styginidae: Bumastus cuniculus
Trilobita: Corynexochida: Styginidae: Bumastus ioxus (Hall)
Trilobita: Corynexochida: Styginidae: Bumastus niagarensis (Whitfield)
Trilobita: Corynexochida: Styginidae: Kosovopeltis acamas (Hall)
Trilobita: Lichida: Lichidae: Arctinurus sp.
Trilobita: Lichida: Lichidae: Dicranopeltis sp.
Trilobita: Lichida: Lichidae: Trochurus nasuta (Weller)
Trilobita: Phacopida: Calymenidae: Gravicaleymene celebra
Trilobita: Phacopida: Cheiruridae: Cheirurus niagarensis (Hall)
Trilobita: Phacopida: Cheiruridae: Sphaerexochus romingeri
Trilobita: Phacopida: Dalmanitidae Dalmanites platycaudatus Weller
Trilobita: Phacopida: Phacopidae: Eophacops handwerki (Weller)
Trilobita: Phacopida: Encrinuridae: Encrinurus nereus Hall
Trilobita: Phacopida: Encrinuridae: Encrinurus reflexus Hall
Trilobita: Odontopleurida: Odontopleuridae: Ceratocephala goniata Warder
Trilobita: Proetida: Aulacopleuridae: Otarion sp.
Trilobita: Proetida: Aulacopleuridae:  proetid
Trilobita: Harpetida: Harpetidae: Scotoharpes telleri (Weller)

Photo Gallery

Silurian Reef Fossil illustration, Plate 27, Fig. 14, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 27, Fig. 13, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 27, Fig. 12, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 22, Fig. 03, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 22, Fig. 02, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 22, Fig. 01, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 12, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 11, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 10, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 09, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 08, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 07, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 06, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 05, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 04, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 03, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 02, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 21, Fig. 01, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 20, Fig. 12, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 20, Fig. 11, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 20, Fig. 10, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 20, Fig. 09, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 10, Fig. 14, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian trilobites
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 10, Fig. 13, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 10, Fig. 12, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 10, Fig. 09, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 10, Fig. 11, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
Silurian Reef Fossil illustration, Plate 10, Fig. 08, Wisconsin Geology Survey
© The Field Museum - CC BY-NC
An Illustration by Mary Williams of a Silurian Busmatus trilobite based on specimens of Bumastus chicagoensis and other closely related species from the Chicago area.
© The Field Museum - CC BY-NC

Taxonomy