Gnathia jimmybuffetti is a species of isopod native to the Florida Keys.

[2] This makes it the first new species of gnathiid to be discovered in Florida over the past 100 years.

[3] Gnathia jimmybuffetti is named after American singer Jimmy Buffett.

[2] It possesses a slightly produced frontal margin, making it distinguishable from other species in the region.

[3] Gnathia jimmybuffetti is a parasitic isopod that feeds on mostly fishes.