Rhynchonellata - Orthida - Rhipidomellidae

Alternative combinations: Orthis pecosi, Orthis pecosii

Full reference: J. Marcou. 1858. Geology of North America with two reports on the Prairies of Arkansas and Texas, the Rocky Mountains of New Mexico, and the Sierra Nevada of California 1-144

Belongs to Rhipidomella according to Z. Q. Chen and G. R. Shi 2006

Sister taxa: Rhipidomella carbonaria, Rhipidomella caucasica, Rhipidomella cora, Rhipidomella corallina, Rhipidomella cordialis, Rhipidomella dzhuvankarensis, Rhipidomella hessensis, Rhipidomella hispidula, Rhipidomella kharaulakhensis, Rhipidomella miaolingensis, Rhipidomella michelini, Rhipidomella miscella, Rhipidomella obesiconcha, Rhipidomella orthogonia, Rhipidomella parva, Rhipidomella penniana, Rhipidomella pressula, Rhipidomella subcircularis, Rhipidomella uralica, Rhipidomella vediensis

Ecology: stationary epifaunal suspension feeder

Average measurements (in mm): shell 9.69 x 10.55, valve 10.5 x 10.3