Landman, Neil H.; Bandel, Klaus.
(New York, N.Y. : American Museum of Natural History, 1985)
"The first few septa and associated structures in the early whorls of Mesozoic ammonites were studied in a number of genera including Quenstedtoceras, Kosmoceras, Euhoplites, Hypacanthoplites, Baculites, and Scaphites and ...