Oniscidean

Nevertheless, these studies strongly suggest that arginine is not an essential amino acid in oniscideans.

The oniscidean digestive system has been extensively studied and well described in both slaters and sowbugs (Hames and Hopkin 1989; Štrus et al. 1995).[…]Frequent moulting is an important characteristic of juvenile and adult oniscideans and is related to growth, renewal of the cuticle and reproduction in mature females.

Some oniscideans, which are ordinarily terrestrial, have re-invaded the continental saline waters (e.g. Haloniscus searlei) or even normal freshwater (e.g. Trichoniscidae and Styloniscidae).