isopods are considered crustaceans because of their segmented shells and jointed legs!!
some of them are land animals but most live deep at the bottom of the ocean in cold water. both terrestrial and aquatic isopods have gills, but terrestrial gills (called pleopods) are a little different, they're like a mix of lungs and gills
a fun little fact about isopods is that they can be hermaphroditic, SO YAYYY TRANS CRUSTACEANS!!!!!
isopods are detritivores, meaning they eat dead stuff. on land they eat rotting wood, dead leaves, and fungi. in the ocean, they eat dead animals like squids and whales.
they're also invertebrates!
all isopods whether in the ocean or on land are sensitive to light, which is why aquatic ones live at the bottom of the ocean or are nocturnal if they live in shallow water, and terrestrial ones live on the ground under branches and rocks and leaves (though this also has to do with the fact that these areas are moist, helping them to breathe through their pleopods).
if any of this information is incorrect, PLEASE let me know, i want to learn anything about isopods that i can!