
Diplomystus is an extinct genus of freshwater and marine clupeomorph fish distantly related to modern-day extant herrings, anchovies, and sardines. It is known from the United States, Canada, China, Uzbekistan and Lebanon from the Late Cretaceous to the middle Eocene. Many other clupeomorph species from around the world were also formerly placed in the genus, due to it being a former wastebasket taxon. It was among the last surviving members of the formerly-diverse order Ellimmichthyiformes, with only its close relative Guiclupea living for longer.
Diplomystus is an extinct genus of freshwater and marine clupeomorph fish distantly related to modern-day extant herrings, anchovies, and sardines. It is known from the United States, Canada, China, Uzbekistan and Lebanon from the Late Cretaceous to the middle Eocene. Many other clupeomorph species from around the world were also formerly placed in the genus, due to it being a former wastebasket taxon. It was among the last surviving members of the formerly-diverse order Ellimmichthyiformes, with only its close relative Guiclupea living for longer.
== Taxonomy == The genus contains the following species: D. birdi Woodward, 1895 – Late Cretaceous (Cenomanian) of Lebanon (Sannine Formation) D. dentatus Cope, 1877 – Early Eocene of Wyoming, USA (Green River Formation) D. dubertreti Signeux, 1951 – Late Cretaceous (Santonian) of Lebanon (Sahel Alma) D. shengliensis Zhang, Zhou & Qing, 1985 – Middle Eocene (Bartonian) of China (Shahejie Formation)
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).