Naiadites is an extinct genus of thin-shelled non-marine bivalve from the Upper Carboniferous coal-measures of Nova Scotia in Canada.

The genus contains the following species: N. orhallensis has been described as occurring in dense colonies attached to floating or submerged stems of terrestrial plant wrack.

[5] Naiadites devonicus, known only from the Waterloo Farm lagerstätte deposit, constitutes the dominant preserved aquatic invertebrate therein, with hundreds of valves having been collected, generally ranging between 10 and 25 mm in length.

[3] Gess and Whitfield have suggested that N. devonicus lived attached to the abundant submerged and floating vegetation at Waterloo Farm.

Probably concentrated where river(s) entered the estuarine lake carrying suspended particulate organic matter they were likely rafted on floating vegetation into more saline portions of the system and would have provided an important food source for predatory fishes.