†Anthracospirifer arcoensis Butts 2007 (lamp shell)
Rhynchonellata - Spiriferida - Spiriferidae
Full reference: S. H. Butts. 2007. Silicified Carboniferous (Chesterian) Brachiopoda of the Arco Hills Formation, Idaho. Journal of Paleontology 81(1):48-63
Belongs to Anthracospirifer according to S. H. Butts 2007
Sister taxa: Anthracospirifer birdspringensis, Anthracospirifer curvilateralis, Anthracospirifer leidyi, Anthracospirifer occiduus, Anthracospirifer oliveirai, Anthracospirifer shawi, Plicatocyrtia zitteli
Type specimen: Its type locality is Arco Hills type section, packstone, which is in a Serpukhovian deep subtidal packstone in the Arco Hills Formation of Idaho
Ecology: stationary epifaunal suspension feeder