Cossmannica jacksonensis is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. This species is one of many other species known to exist within the genus, Cossmannica.
The length of the shell measures approximately 6.1 mm. The teleoconch contains eight whorls.
This marine species occurs off the coasts of Queensland, Australia, within the Great Barrier Reef and other various marine areas nearby.