| Psittacorhynchus verweyi den Hartog, 1968 | October, 1964 | intertidal salt marsh | sand | transition belt between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, forms an association. |
| Proxenetes bilioi den Hartog, 1966 | Oct 1964 | | | salt-marsh area south of Bergen op Zoom. collected by Bilio. transition belt between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, forms an association. |
| Macrostomum balticum Luther, 1947 | Mar 1964 | | | salt-marsh area. transition belt between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, forms an association. |
| Proxenetes intermedius den Hartog, 1966 | Oct 1964 | | | salt-marsh area south of Bergen op Zoom, collected by Bilio. euhaline part of the Deltaic ares. |
| Proxenetes minimus den Hartog, 1966 | Oct 1964 | | | Salt-marsh south of Bergen op Zoom. collected by Bilio. Deltaic area characterizeds the species as very euryhaline. |
| Proxenetes segmentatus den Hartog, 1966 | Oct 1964 | | | Salt-marsh south of Bergen op Zoom. collected by Bilio. In the transition between mud-flat and salt-marsh, where the glass-wort, Salicornia europaea, is the only phanerogam, P. segmentatus is probably not uncommon. |
| Proxenetes britannicus den Hartog, 1966 | Oct 1964 | | | Salt-marsh area south of Bergen op Zoom. collected by Bilio. |
| Proxenetes puccinellicola Ax, 1960 | Oct 1964 | | | Salt-marsh area south of Bergen op Zoom (Bilio, personal communication) |
| Proxenetes cisorius den Hartog, 1966 | Oct 1964 | | | salt-marsh area south of Bergen op Zoom. (Bilio, personal communication) |
| Proxenetes karlingi Luther, 1943 | Oct 1964 | | | salt marsh south of the town of Bergen op Zoom, collected by Bilio. |
| Messoplana elegans Luther, 1948 | Oct 1964 | | | Salt-marsh area south of Bergen op Zoom, collected by Bilio. |