Shark / ray
Myledaphus bipartitus
Guitarfish
Myledaphus is a freshwater guitarfish whose small hexagonal crushing teeth are the most common vertebrate fossil in Hell Creek and Judith River microsites. The teeth are a few millimetres across with a flat, striated crown and are sold by the vial. They are useful index fossils for Late Cretaceous river deposits.
| Phylum | Chordata |
|---|---|
| Class | Chondrichthyes |
| Order | Rajiformes |
| Family | Rhinobatidae |
| Group | Shark / ray |
| Rank (PBDB) | genus· Paleobiology Database |
| Author | Cope 1876· Paleobiology Database |
| Classification (PBDB) | Chordata › Chondrichthyes › Rhinopristiformes › Rhinobatidae· Paleobiology Database |
| Range (PBDB) | 93.9–61.7 Ma· Paleobiology Database |
| PBDB occurrences | 242· Paleobiology Database |
Elsewhere
- GBIF: 4824588
- PBDB: 34808
- Wikidata: Q22105132
- PBDB taxon page
- Wikipedia: Myledaphus
- PBDB search: Myledaphus
Cite this article
Stratum Study. "Myledaphus bipartitus" (Taxon). Stratum Study pack 2026.09, as of 2026-09-19. https://stratum.black/study/taxa/myledaphus-bipartitus. Accessed 2026-09-20.
@misc{stratum-myledaphus-bipartitus,
title = {Myledaphus bipartitus},
author = {{Stratum Study}},
howpublished = {\url{https://stratum.black/study/taxa/myledaphus-bipartitus}},
year = {2026},
note = {Taxon article, Stratum Study pack 2026.09, as of 2026-09-19; sources: stratum, pbdb, wikidata, commons. Accessed 2026-09-20.}
} Citations carry the pack version and the article's as-of date so they resolve to the same text later. The facts themselves belong to the sources listed below; cite those for the science.