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Published online by Cambridge University Press: 14 July 2015
The Polychaetes of the Mazon Creek biota have been documented previously (Dawson, 1881; Thompson and Johnson, 1977; Thompson, 1979; Fitzhugh et al., 1997). Owing mainly to their rarity, several genera of fossil polychaetes had been noted but not described. Active amateur collecting of Mazon Creek concretions has allowed a number of uncommon, undescribed, flabelligerid annelid specimens to be cataloged into private and museum collections. All flabelligerid individuals are considered to be of one species.