A recent work has recovered a 3rd or 4th species, D. enigmaticus, from the Late Triassic of New Jersey, representing another small-bodied form living in sympatry with the similarly sized D.

[3] Diplurus represents a freshwater taxon that inhabited the fluvial, palustrine and lacustrine environments that filled the Valley incisions of the Newark Supergroup, mostly fed by the coeval activity of the North American CAMP.

[4] Late Triassic D. newarki and D. enigmaticus lived along a great invertebrate diversity, including Hyriinae, Unionidae and Corbiculidae clams, freshwater crayfishes (Cytioclopsis), ostracods (Darwinula spp.

), insects (Belostomatidae, Coleoptera) and Notostracan crustaceans (Triops spp), then vertebrates such as the hybodont shark Carinacanthus and the bony fishes Turseodus, Synorichthys, Cionichthys, Semionotus and another coelacanth, Pariostegus.

[4] The larger Lower Jurassic D. longicaudatus shared its environment with Unionidae clams, freshwater snails (Hydrobia and Gyraulus) insects (Diptera and Coleoptera larvae, such as Mormolucoides), clam-shrimps (Cyzicus spp.)