Gadophycis ovalis

Gadophycis ovalis

(Frost, 1931)

Common name Cusk-eel relative
Fossil group Bony Fish
Order Ophidiiformes
Family Ophidiidae
Genus Gadophycis
Taxonomic status Taxonomically Uncertain
Geological age Ypresian
Recorded rarity by age
Ypresian: Not yet established
View age-specific evidence and explanation
AgeRecorded OccurrencesLocalitiesRarity
Ypresian11Not yet established

These counts describe published LBPS Occurrence records with directly assigned, unambiguous geological-unit mappings—not specimen abundance. Records at restricted Localities and ambiguous or unsupported ages are excluded. Species-level age labels are not used as proof of an age-specific Occurrence.

Specimen-based rarity requires comparable, correctly identified physical fossils, geological provenance and publication permissions. It does not estimate your chance of finding a fossil or collecting access.

Quick Identification

Look for: an elongate oval sagittal otolith with a noticeably deep, smoothly curved ventral rim and smooth rather than serrated margins. Use the sulcus and inner-face relief as supporting characters; eroded otoliths that no longer preserve these features should be left at a broader ophidiiform identification.

Summary

Gadophycis ovalis was an early Eocene ophidiiform known from sagittal otoliths. Its relationship with cusk-eel lineages is supported by otolith morphology, although the precise placement of the extinct otolith-based genus Gadophycis is less secure than that of living genera.

The fossil record is therefore almost entirely otolith-based. Its morphology is consistent with a marine, probably demersal ophidiiform ecology, but body form, swimming behaviour and diet cannot be reconstructed directly from the otolith alone.

Diagnostic Features

  • Overall outline is elongate oval rather than short or strongly angular.
  • Ventral rim is distinctly deep and smoothly curved.
  • Dorsal and ventral margins are smooth rather than conspicuously serrated.
  • A distinct ventral furrow of the type developed in Gadophycis serratus is absent.
  • Species-level identification requires the deep smooth ventral outline together with the preserved sulcus pattern; outline alone is insufficient.

Fossil Details

Typical size
Not reliably established from the published comparative specimen record.
Fossil material
Otolith
Preservation
Otolith margins are readily chipped or rounded, and abrasion of the inner face can weaken the sulcus and ventral relief. Because the smooth rim and ventral profile are part of the useful comparison, heavily eroded specimens should not be assigned to species solely on overall size or a partial outline.

Similar Species

Recorded Fossil Sites

References

  • Schwarzhans, W.; Bratishko, A. (2011). The otoliths from the middle Paleocene of Luzanivka (Cherkasy district, Ukraine). Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 261(1), 83–110 View reference
  • White, E.I. (1931). The vertebrate faunas of the English Eocene. I. From the Thanet Sands to the Basement Bed of the London Clay. 121 pp.. British Museum (Natural History), London View reference
Last Reviewed
21 August 2026 Reviewed by Sam Harris