Eofallotaspis sp

The Oldest American Trilobite

Trilobites Order Redlichiida, Suborder Olenellina, Superfamily Fallotaspidoidea, Family Fallotaspididae, Subfamily Fallotaspidinae
Geologic Age: Early Cambrian
Trilobite is 12 mm long
Hamar Waucobean Series, Montezuman Stage of the Fallotaspis Biozone of the Campito Formation, Esmeralda County, Nevada
Remarks: Fortey (2000) labels the genus Fallotaspis (Subfamily Fallotaspidinae
) as the oldest trilobites in the fossil record. As a result, the rather large crescent holochroal eyes seen here would be among the oldest of the sophisticated trilobite eyes preserved in the fossil record. Also, being a member Suborder Olenellina, Fallotaspis did not have dorsal sutures. This trilobiteis is exceedingly rare, and the second oldest trilobite species ever discovered from the ancient continent of Laurentia (Hollingsworth, 2005), and consequently, the oldest American trilobite. Scientist believe it would be the progenitor of Eoredlichia and all of Family Redlichiidae.

Also see: American Trilobites