Sciadonus jonassoni

Common Name

Jonasson's Blindfish

Year Described

Nybelin, 1957


Dorsal Fin: 68
Anal Fin: 43
Pectoral Fin: 9
Pelvic Fin: absent
Caudal Fin: 6
Gill Rakers: 11-12
Vertebrae: 68 (39 precaudal)

Body elongate and slender. Head large and broader than body. The mouth is slightly oblique and the lower jaw projects beyond the upper. Premaxillary and dentary with teeth. Vomer with two fangs. Eyes are tiny black dots. The pectoral fin base is extended as a limb-like pedicel. Dorsal fin short; origin around mid-body. The dorsal and anal fins are continuous with the caudal fin, which is relatively long.


Body pale translucent with black speckles along the dorsal fin base, anal fin base, and on the head. Peritoneum dark.


Known specimen is 38mm SL.


Benthic at abyssal depths (5045-5610m).


Known from one specimen in the eastern central Atlantic.


Nielsen, J.G. 1969. Systematics and biology of the Aphyonidae (Pisces, Ophidioidea). Galathea Report v. 10: 7-90, Pls. 1-4.

Nielsen, J.G., D.M. Cohen, D.F. Markle, and C.R. Robins. 1999. Ophidiiform fishes of the world (Order Ophidiiformes). An annotated and illustrated catalogue of pearlfishes, cusk-eels, brotulas and other ophidiiform fishes known to date. FAO Fish. Synop. 125(18): 178p.