This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
C. Sayar, 2013 - A new Late Ordovician Hirnantia brachiopod fauna from NW Turkey, its biostratigraphical relationships and palaeogeographical setting - Geological Magazine (150), 479-496 (journal article, English)
A. Williams, 2002 - Part H Brachiopoda (revised): Volume 4, Rhynchonelliformea (part) - Treatise on Invertebrate Paleontology (), 921-1688 (serial monograph, English)
A. J. Boucot, 1964 - On Some Atrypoid, Retzioid, and Athyridoid Brachiopoda - Journal of Paleontology (38), 805-822 (journal article, English)