Paraphyonus iselini

Common Name

Sargasso Blindfish

Year Described

Nielsen, 2015


Dorsal Fin: 59-65
Anal Fin: 47-53
Pectoral Fin: 12-14
Pelvic Fin: 1
Caudal Fin: 7-8
Gill Rakers: 11-13 (long rakers), the rest degenerate
Vertebrae: 63-65 (26-28 precaudal)

Elongate, relatively slender, and translucent, with loose gelatinous skin. Head very large with blunt snout. Mouth extending well past eye. Eye tiny and embedded under skin. Premaxillary, dentary, and vomer with small teeth. Pseudobranchs present. Penis with two small claspers. Dorsal fin origin further back than in Aphyonus gelatinosus (>42.5-46.0% SL). Dorsal and anal fins continuous with caudal fin.


Fresh specimens are pale translucent yellow with a very dark peritoneum.


Specimens range from 61-118mm SL.


Abyssal from 4279-5011m.


Known from the Sargasso Sea and off Venezuela.


Nielsen, J. G. 2015. Revision of the aphyonid genus Aphyonus (Teleostei, Ophidiiformes) with a new genus and two new species. Zootaxa, 4039(2), 323-344.

Other Notes

Differs from P. rassi in having more long gill rakers (11-13 vs. 3-4) and much lower meristics.