ammonites
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Geraroides maxima Melander 1903

PaleoDB taxon number: 214843

Full reference: A. L. Melander. 1903. Some additions to the Carboniferous terrestrial arthropod fauna of Illinois. Journal of Geology 11(2):178-198

Sister taxa: none

Type specimen: FMNH UC 9244, an exoskeleton. Its type locality is Mazon Creek (FMNH Gurley collection), which is in a Westphalian D deltaic mudstone in the Carbondale Formation of Illinois.