Diplomystus dentatus — Diplomystus dentatus Cope
Diplomystus dentatus Cope Smithsonian Institution (NMNHPALEO), Smithsonian Open Access, CC0

Fish

Diplomystus dentatus

Double-hinged herring

Diplomystus dentatus is the deep-bodied Green River herring relative with an upturned mouth and a row of dorsal scutes, the second-commonest Fossil Lake fish after Knightia. Large specimens (30 cm and up) and 'aspiration' plates with a Diplomystus choking on a Knightia are collector favourites. Preparation quality varies enormously between the 18-inch layer and the split-fish layer.

PhylumChordata
ClassActinopterygii
OrderEllimmichthyiformes
FamilyParaclupeidae
GroupFish
Sizeto 65 cm; usually 10–30 cm
Rank (PBDB)genus· Paleobiology Database
AuthorCope 1877· Paleobiology Database
Classification (PBDB)Chordata › Osteichthyes › Ellimmichthyiformes › Armigatidae· Paleobiology Database
Range (PBDB)143–33.9 Ma· Paleobiology Database
PBDB occurrences25· Paleobiology Database

Elsewhere

Cite this article

Stratum Strata. "Diplomystus dentatus" (Taxon). Stratum Strata pack 2026.09, as of 2026-09-21. https://stratum.black/strata/taxa/diplomystus-dentatus. Accessed 2026-09-21.

@misc{stratum-diplomystus-dentatus,
  title        = {Diplomystus dentatus},
  author       = {{Stratum Strata}},
  howpublished = {\url{https://stratum.black/strata/taxa/diplomystus-dentatus}},
  year         = {2026},
  note         = {Taxon article, Stratum Strata pack 2026.09, as of 2026-09-21; sources: stratum, pbdb, wikidata, smithsonian, nhm. Accessed 2026-09-21.}
}

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