Amphipods and Isopods

Arthrostraca was an order that included all species of Isopods and Amphipods because of their superficial similarities.  This combination of two groups was retained within a newer classification scheme as Edriophthalma and a sister taxa Mysidacea which have since been rejected in favour of the order Peracarida which encompasses all members which were previously in these two groups.  This chart shows the nervous system (blue), circulatory organ of the open blood system (pink), alimentary canal (yellow), digestive glands (orange) and brooding eggs under flattened segments of limbs (grey circles in 2 & 6).