Cuckoo Ray Eggcase

Cuckoo Ray Eggcase © Shark Trust.Latin Name: Leucoraja naevus

Very smooth and relatively delicate compared to other species. Widest across its ‘waist’. Both sides convex. Very similar texture to the Spotted Ray capsule.

Capsule Size: Approximately 50-70mm long x 30-50mm wide excluding horns (when soaked).

Horns (when present):

  • Top pair of horns very long, longer than the length of the capsule. Frequently curl across one another.
  • Top pair of horns notably wide at their base (c. 5-7 mm), but rapidly taper to thin points.
  • Bottom pair of horns short, no longer than the length of the capsule.
  • Bottom pair of horns tend to curl in towards one another, but do not meet. 
  • Very similar to the bottom pair of horns on the Spotted Ray.

Lateral keels: None.

No field present between bottom pair of horns. If present and undamaged, the field between top pair of horns is deep, and markedly convex.

Characteristic features:
Could potentially be confused with the Spotted Ray as the capsule is the same texture and size. However, the absence of a ‘bobsleigh’ posture and the exceptionally long pair of horns at the top of the capsule will instantly identify them as eggcases of the Cuckoo Ray.

Similar Eggcases: Spotted Ray (Raja montagui).
This is a deep water species and eggcase findings are rare. If you think you’ve found this eggcase, please submit your record with a photograph for verification.