Pufferfish are the most notorious tetrodotoxin (TTX) source. The presence of TTX has been reported in what other species?
TTX was believed to exist exclusively in pufferfish, until the mid-1960s, when the eggs of the California newt Taricha torosa were discovered to contain TTX. Since then, TTXs are identified in a variety of aquatic animals, including bivalve mollusks, gastropods, and echinoderms, as well as other mollusks and crustaceans. See Tables 1-4 in the cited reference to review common names and species of organisms reported to contain TTX.
Katikou P, Gokbulut C, Kosker AR, Campàs M, Ozogul F. An Updated Review of Tetrodotoxin and Its Peculiarities. Mar Drugs. 2022;20(1):47. Published 2022 Jan 3. doi:10.3390/md20010047