Isopod / sea louse attached to the shell of a Bullia digitalis/ beach snail, possibly Exosphaeroma kraussi, but definitely in the Sphaeromatid Family
Peter Glynn says:
It appears to be a sphaeromatid isopod, but impossible to identify to species without careful examination of specimens.
I did not collect the specimen, and have not seen another since then. It appears to me that the isopod maybe grazing the algae on the shell of the bullia.
Locally-indigenous sprawling perennial daisy often on road verges
Big breeding herd over 40 at Tsumcor waterhole
It is a fynbos wetland area (river floodplain) with afromontane elements in it - e.g. this tree!
so difficult to choose the habitat!