Bellacartwrightia is a relatively uncommon genus of Phacopid trilobite, found in the mid-Devonian Hamilton Group of New York state, mainly in strata exposed near Lake Erie just west of Buffalo. This trilobite is usually about 1.5" to 2" long. It was previously known as Metacanthina. A very similar trilobite from the Devonian of Morocco is still sold as Metacanthina, but considerable research is still being done on Moroccan trilobites.