The subdivision Clupeomorpha contains two orders, one known only from the fossils of China. Nelson (1994) discussed characteristics of the group following the work of Grande (1985).
Grande, L. 1985. Recent and fossil clupeomorph fishes with materials for revision of the subgroups of clupeoids. Bulletin of the American Museum of Natural History 181(2): 231-372
Nelson, J.S. 1994. Fishes of the World. New York : John Wiley & Sons 600 pp.