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Derbyia informis

Strophomenata - Orthotetida - Derbyiidae

Taxonomy
Derbyia informis was named by Cooper and Grant (1974). Its type specimen is USNM 152606c, a shell (Articulated shell), and it is not a trace fossil.

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