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Iso (=equal) poda (=foot). The legs on this creature are all very similar, unlike those of the Amphipoda (sandhoppers, etc). There are other orders of crustaceans which can be similar (e.g. Tanaids),but they tend to be smaller. The chromatophores (star-shaped pigment cells visible through the cuticle) are typically found in marine isopods, as well as in the evidently different smaller decapods (prawns, etc), but as Atylotus says, recognising the species is the easiest way of placing these creatures in the right Phylum, Class and Order.