Trilobita - Phacopida - Pterygometopidae

Alternative combinations: Calyptaulax goodridgii, Dalmanites (Pterygometopus) goodridgii

Full reference: C. Schuchert. 1900. On the Lower Silurian (Trenton) fauna of Baffin Land. Proceedings of the United States National Museum. Proceedings of the United States National Museum 22(1192):143-178

Belongs to Eomonorachus according to DeMott 1963

See also Delo 1940 and Schuchert 1900

Sister taxa: Eomonorachus buttsi, Eomonorachus divaricatus, Eomonorachus intermedius

Type specimen: USNM 28170a, a skeleton (A cephalon and eight thoracic segments)

Distribution: found only at GSC loc 89830 sec 2, Creek section at shore ½ north of Hall Beach Eskimo village (Ordovician of Northwest Territories)

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Specimen images are retrieved through the ePANDDA API.