Gregoriidae

Gregoriidae is an extinct family of early sharks from the Carboniferous period.[1] It currently includes three described genera: Gregorius, Srianta, and Bealbonn. This family includes remains formerly ascribed to "Desmiodus," which is now considered a nomen vanum.[2] The relationships between the included genera are not entirely clear.[3] Fossils are known from Serpukhovian-aged formations including the Bear Gulch Limestone and Surprise Canyon Formation.[4]

Gregoriidae
Temporal range: Serpukhovian
Srianta cf. S. srianta from the Surprise Canyon formation
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Chondrichthyes
Subclass:
Euchondrocephali
Infraclass:
Paraselachii
Family:
Gregoriidae
Genera

References
  1. "Fossilworks: Gregoriidae". fossilworks.org. Retrieved 2020-10-10.
  2. "LUND, R. & GROGAN, E.D. (2004) | Literature | Shark-References". shark-references.com. Retrieved 2020-10-10.
  3. Grogan, E. D., & Lund, R. (2008). A basal elasmobranch, Thrinacoselache gracia n. gen and sp.,(Thrinacodontidae, new family) from the Bear Gulch Limestone, Serpukhovian of Montana, USA. Journal of Vertebrate Paleontology, 28(4), 970-988.
  4. John-Paul M. Hodnett, David K. Elliott; Carboniferous chondrichthyan assemblages from the Surprise Canyon and Watahomigi formations (latest Mississippian–Early Pennsylvanian) of the western Grand Canyon, Northern Arizona. Journal of Paleontology ; 92 (S77): 1–33. doi: https://doi.org/10.1017/jpa.2018.72
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