Paraulopus davisi

Paraulopus davisi

(Frost, 1925)

Common name Cucumberfish relative
Fossil group Bony Fish
Order Aulopiformes
Family Paraulopidae
Genus Paraulopus
Taxonomic status Accepted
Geological age Ypresian

Summary

Paraulopus davisi was an aulopiform fish known from London Clay otoliths and usually associated with the paraulopid lineage. Living paraulopids are bottom-associated marine predators, often inhabiting shelf and slope settings and feeding on smaller fishes and invertebrates. That ecology is a reasonable guide to the fossil animal, but the body itself is not preserved.

The otolith has a distinctive inner-face geometry and sulcus organization, including a relatively short, straight cauda. Later otolith studies have noted that the species-level diagnosis deserves revision, so complete, well-preserved specimens are especially important for evaluating its morphology.

Quick Identification

Look for: a paraulopid-type otolith with a relatively untwisted inner face, a broad dorsally expanded ostium and a short, nearly straight cauda; the whole otolith is compact rather than extremely elongate.

Diagnostic Features

  • Inner face is not strongly twisted along the long axis.
  • Ostium is expanded dorsally and broader than the cauda.
  • Cauda is comparatively short and nearly straight.
  • Sulcus lies centrally to slightly supramedially on the inner face.
  • Anterior outline is fuller around the ostial opening than the more tapered posterior end.

Fossil Details

Preservation
London Clay otoliths may be chipped, rounded, dissolved or polished. Damage to the rostrum and antirostrum changes the outline, while abrasion of the inner face can weaken or erase the sulcus; either can make a species-level identification unsafe.

Recorded Fossil Sites

References

  • Schwarzhans, W. (2007). The otoliths from the Middle Eocene of Osteroden near Bramsche, north-western Germany. Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen, 244(3), 299–369 View reference
  • Steurbaut, E.; Nolf, D. (1988). Ypresian teleost otoliths from Belgium and northwestern France. Bulletin de la Société belge de Géologie, 97(3–4), 321–347 View reference
  • Stinton, F. C. (1966). Fish otoliths from the London Clay. Faune ichthyologique du London Clay, 404–464. British Museum (Natural History), London View reference
Last Reviewed
20 August 2026 Reviewed by Sam Harris