''Tomognathus'' was a halecomorph fish related to the modern

bowfin The ruddy bowfin (''Amia calva'') is a ray-finned fish native to North America. Common names include mudfish, mud pike, dogfish, grindle, grinnel, swamp trout, and choupique. It is regarded as a relict, being one of only two surviving species ...

that lived in the

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...

Period. It was named by Dixon in 1850. The name ''Tomognathus'' was also later applied to a modern species of ant by Mayr in 1861. But since the name was already taken it came instead to be classified as ''

Harpagoxenus ''Harpagoxenus'' is a genus of ants in the subfamily Myrmicinae. Found in the Palaearctic and Nearctic ecozones of the world, ''Harpagoxenus'' was first established as ''Tomognathus'' by Mayr (1861) to house the species ''Myrmica sublaevis'' (now ...

''.

References

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† A dagger, obelisk, or obelus is a typographical mark that usually indicates a footnote if an asterisk has already been used. The symbol is also used to indicate death (of people) or extinction (of species or languages). It is one of the mo ...

Cretaceous fish {{Amiiformes-stub