Antennal scale long, setose all around. Pleopods: 3rd pleopod with multi-jointed exopod and unjointed endopod; 4th pleopod with extremely long, multi-jointed exopod which is armed with very long modified setae on distal segments, and unjointed endopod; 5th pleopod with both rami multi-jointed Lateral margin of telson with row of subequal spines.
Ref.: O. S. Tattersall (1955).
Kingdom Animalia Phylum Crustacea Superorder Peracarida Order Mysidacea Suborder Mysida Family Mysidae Subfamily Mysinae Tribe Erythropini Genus Arthromysis Species Arthromysis magellanica