Cybeloides iowensis Price: SOLD

Cybeloides iowensis Trilobite: length – 18.30 mm (0.72”)          Width – 12.89 mm (0.50”) Matrix: length - 30.60 mm (1.20”)       Width –  Clermont Member, Maquoketa Formation Fayette County, Iowa
Here is an opportunity to own a type specimen of the Genus Cybeloides from the type formation. This Cybeloides iowensis offered is unprepped but the photos provide evidence of its completeness. The small pygidium appears to be missing and there is some damage to the right fixagena. The small occipital spine is also missing. The elongated thoracic segments can be seen in the photographs as well as the distinctive anterior glabella spines. This is an opportunity to own a truly distinctive North American spiny trilobite, very rarely encountered complete.

Cybeloides iowensis During his early works on invertebrate fossils at the Field Museum in Chicago Arthur W. Slocum took on the task of making sense out of the Maquoketa Formation trilobites. His work, which was published in 1913, has remained a valuable reference to this day. One of the trilobites was a new Encrinurid upon which he erected a new genus named Cybeloides. He assigned four North American species to this new genus (C. ella, C. prima, C. winchelli and the Maquoketa Formation iowensis) and set the type species as iowensis. Cybeloides iowensis is a North American spiny trilobite exhibiting long genal spines, 7 elongated posterior thoracic segments (it has 12 thoracic segments in total) with the 6th extending as much as a third its length past the small pygidium. It possesses an occipital spine, elevated eyes and short spines directed forward from the anterior of the glabella. A very unusual trilobite.