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Temporal range: Late Jurassic–Paleocene
Belonostomus kochii 2.jpg
Belonostomus kochii
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Aspidorhynchiformes
Family: Aspidorhynchidae
Genus: Belonostomus
Agassiz, 1834


Belonostomus (from Greek: βέλος belos, 'dart' and Greek: στόμα stóma 'mouth')[1] is a genus of prehistoric ray-finned fish that was described by Louis Agassiz in 1844. It is a member of the order Aspidorhynchiformes, a group of fish known for their distinctive elongated rostrums. The oldest known species are from the Upper Jurassic of Germany, with the youngest known species from the late Paleocene. Fossils of Belonostmus have been found worldwide in marine deposits. It likely consumed plankton or other small fish.[2]

Belonostomus species include:

  • Belonostomus kochii
  • Belonostomus acutus
  • Belonostomus carinatus
  • Belonostomus crassirostris
  • Belonostomus indicus
  • Belonostomus longirostris
  • Belonostomus münsteri
  • Belonostomus tenuirostris
Belonostomus tenuirostris (Agassiz, 1835) from the Jurassic of Painten, Germany


  1. ^ Roberts, George (1839). An etymological and explanatory dictionary of the terms and language of geology. London: Longman, Orme, Brown, Green, & Longmans. p. 19. Retrieved 29 December 2021.
  2. ^ Van Vranken, Nathan; Fielitz, Christopher; Ebersole, Jun (2019). "New occurrences of Belonostomus (Teleostomorpha: Aspidorhynchidae) from the Late Cretaceous of the North American Gulf Coastal Plain, USA". Palaeontologia Electronica. 22 (3): 1–11. doi:10.26879/983. ISSN 1935-3952. S2CID 204264731.