The most common isopod on the sandy beach, A. perconvexus is found throughout the year towards Ellwood beach. They tend to be closer to cliff sides but can overlap with lower kelp wrack communities. Their size range is between 2.0mm and 20.0mm. A. perxonvexus is active during the night, but can be found under rocks and detritus during the day. A mixture of black, brown, yellow and orange allows A. perconvexus to easily blend in with sand and detritus. Their diet consists of dried kelp, though they scavenge decaying arthropods.