Like other eels, saccopharyngids have leptocephalus larvae. There are 16 families of leptocephalus organisms that include over 70 species. "Leptocephalus brevirostris" (from the Greek "leptocephalus" meaning "thin- or flat-head"). It was described by Umberto D'Ancona in 1928, originally under the genus "Leptocephalus". It was described by Charles Tate Regan in 1916, originally under the genus "Leptocephalus". It was described by Peter Henry John Castle in 1964, originally under the genus "Leptocephalus". Although not true eels, these fish do have a similar leptocephalus larval form. The giant leptocephalus ("Coloconger giganteus") is an eel in the family Colocongridae (worm eels/short-tail eels).