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.
H. Zapfe, 1972 - Cornucardia hornigii (Bittner) in einer "Dachsteinkalk-Fazies" der Nordalpen [Cornucardia hornigii (Bittner) in a Dachstein Limestone facies of the Northern Alps] - Annalen des Naturhistorischen Museums in Wien (76), 587-604 (journal article, German)
I. Hayasaka, 1925 - On some Paleozoic molluscs of Japan. 1. Lamellibranchiata and Scaphopoda - Science Reports of the Tohoku Imperial University. 2nd series, Geology (8), 1-29 (journal article, English)
H. Morningstar, 1922 - Pottsville fauna of Ohio - Ohio Geological Survey Bulletin (25), 1-312 (journal article, English)
G. H. Girty, 1910 - New genera and species of Carboniferous fossils from the Fayetteville shale of Arkansas - Annals of the New York Academy of Sciences (20), 189-238 (journal article, English)