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Derbyia elongata

Strophomenata - Orthotetida - Derbyiidae

Taxonomy
Derbyia elongata was named by Cooper (1953). Its type specimen is USNM 115589, a shell (Articulated shell), and it is a 3D body fossil. Its type locality is USNM806m, Cerros de los Monos, which is in a Wordian marine limestone in the Antimonio Formation of Mexico.

Sister species lacking formal opinion data
D. ciscoensis, D. deercreekensis, D. kansasensis, D. plattsmouthensis, D. robusta