| Macrostomum hamatum Luther, 1947 | Aug-Sep 1984 | | | Upper Duck Pond. High marsh sediment. |
| Macrostomum burti Ax & Armonies, 1987 | Aug-Sep 1984 | | | Upper Duck Pond, salt marsh sediment. |
| Macrostomum burti Ax & Armonies, 1987 | Aug-Sep 1984 | | medium-coarse sand | Upper Duck Pond, intertidal with halophytes. |
| Macrostomum hystricinum Beklemischev, 1951 | Aug-Sep 1984 | | | Upper Duck Pond. Salt marsh sediment. |
| Archilopsis arenaria Martens, Curini-Galletti & Pucinelli, 1989 | Aug-Sep 1984 | | medium-coarse sand | Upper Duck Pond. Intertidal medium to coarse sand with halophytes. |
| Monocelis sp. Ax & Armonies, 1987 | Aug-Sep 1984 | | | Upper Duck Pond. salt marsh sediment. |
| Monocelis sp. Ax & Armonies, 1987 | Aug-Sep 1984 | | medium to coarse sand | Upper Duck Pond. intertidal medium to coarse sand with halophytes. |
| Promesostoma rostratum Ax, 1951 | Aug-Sep 1984 | | muddy sand | Upper Duck Pond. Algal mats on muddy sand. |
| Stygoplanellina halophila Ax, 1954 | Aug-Sep 1984 | | coarse sand | Upper Duck Pond. Upper border of the salt marsh, coarse sand of an area with fresh water outflow. |
| Brinkmanniella macrostomoides Luther, 1948 | Aug-Sep 1984 | | medium-coarse sand | Upper Duck Pond. Intertidal medium to coarse sand with halophytes. |
| Coronhelmis multispinosus Luther, 1948 | Aug-Sep 1984 | | | Upper Duck Pond, High marsh sediment. |
| Ptychopera westbladi (Luther, 1943) Den Hartog, 1964 | Aug-Sep 1984 | | | Salt marsh sediment. |
| Ptychopera westbladi (Luther, 1943) Den Hartog, 1964 | Aug-Sep 1984 | | medium-coarse sand | intertidal, medium to coarser sand with halophytes. |
| Ptychopera hartogi Ax, 1971 | Aug-Sep 1984 | | | Upper Duck Pond. High marsh sediment. |
| Acrorhynchides robustus (Karling, 1931) | Aug-Sep 1984 | | sand | Upper Duck Pond. Detritus rich sand in a salt marsh. |
| Placorhynchus echinulatus Karling, 1947 | Aug-Sep 1984 | | medium-coarse sand | Upper Duck Pond. Intertidal coarse and medium sand between halophytes. |