Two observations of this strange association between a Seaslug and an Ostracod

Acording Richard Willan " Apparently the thing is an ostracod. They are small crustaceans living in a shell.  Not parasitic, just hanging out... " as he says in Australian !!!

Philibert Bidgrain Reunion, La saline, less 1 m, 6 October 2010, size : 8-10 mm

Chritophe Cadet	Reunion, Etang salé lagoon, less 1 m, 24 Octobre 2010, size : 15 mm