Lobster specimens found in Middle Triassic (Anisian) sediments from the Dutch Winterswijk quarry complex are assigned to Clytiopsis argentoratensis, Oosterinkia neerlandica n. gen., n. sp., and Pseudoglyphea cf. P. spinosa. The lobsters lived in a low energetic, stressed environment with fluctuating salinity levels. The low number of lobster specimens is probably related to their low fossilization potential and the stressed habitat. The four specimens assigned to Clytiopsis argentoratensis are markedly smaller than stratigraphically younger and older relatives, suggesting that their limited size could be related to the stressed environment.