Redescription of Barbus megacephalus Günther, 1876 and Thynnichthys amblyostoma von der Marck, 1876 (Cypriniformes: Cyprinidae) from probable Eocene deposits of Southeast Asia, and an assessment of their taxonomic positions

Two cyprinid fishes from fossil deposits of Sumatra, Indonesia, were briefly described and named in 1876 as new species in extant genera. These taxa, despite being important early records for the family, have been excluded from later studies, probably because the cursory descriptions and lack of illustrations provided little data for other researchers. These two fish, Barbus megacephalus Günther and Thynnichthys amblyostoma von der Marck, are...