| Macrostomum rubrocinctum Ax, 1951 | Aug-Sep 1984 | | | Manawagonish salt marsh, fluffy algal layer of a pool. |
| Macrostomum pusillum Ax, 1951 | Aug-Sep 1984 | | mud | salt marsh. |
| Macrostomum pusillum Ax, 1951 | Aug-Sep 1984 | | | salt marsh. flocky algal layer in a pool. |
| Macrostomum pusillum Ax, 1951 | Aug-Sep 1984 | | | salt marsh sediment between Spartina and Triglochin, with cyanobacteria. |
| Macrostomum hystricinum Beklemischev, 1951 | Aug-Sep 1984 | | mud | salt marsh. Mud between Spartina plants. |
| Monocelis sp. Ax & Armonies, 1987 | Aug-Sep 1984 | | | salt marsh, floating algal mats of a pool. |
| Monocelis sp. Ax & Armonies, 1987 | Aug-Sep 1984 | | mud | salt marsh, muddy sediment of a pool. |
| Promesostoma rostratum Ax, 1951 | Aug-Sep 1984 | | | Manawagonish salt marsh. Fluffy algal layer of a pool. |
| Promesostoma bilobatum Ax & Armonies, 1987 | Aug-Sep 1984 | | | salt marsh. Floating green algal mats of a pool. |
| Ptychopera westbladi (Luther, 1943) Den Hartog, 1964 | Aug-Sep 1984 | | muddy sediment | salt marsh. muddy sediment between Spartina plants. |
| Ptychopera westbladi (Luther, 1943) Den Hartog, 1964 | Aug-Sep 1984 | | mud | salt marsh. mud of salt marsh pool. |
| Proxenetes deltoides den Hartog, 1965 | Aug-Sep 1984 | | muddy | Manawagonish salt marsh. Muddy sediment with cyanobacteria between Spartina and Triglochin. |
| Prognathorhynchus eurytuba Ax & Armonies, 1987 | Aug-Sep 1984 | | muddy sand | salt marsh. Muddy sand with cyanobacteria between Triglochin and Spartina. |
| Provortex sp. Ax & Armonies, 1987 | Aug-Sep, 1984 | | | salt marsh. Fluffy algal layer of a pool. |
| Baicalellia canadensis Ax & Armonies, 1987 | Aug-Sep, 1984 | | mud | slat marsh. Mud between Spartina. |