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P.scaber cannot roll into a ball. When it is disturbed it tends to quickly run away. |
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Head "crown" shaped - the outer lobes being rounded |
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There are two pairs of projections on the uropods although the inner pair are much smaller. |
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The posterior end of the plates of the exoskelton (pereiopods and pleonites) tend to come to a sharp point rather than being rounded. |
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Two pairs of pleopod lungs |
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The outer margin of the plates of the exoskeleton are slightly reverse curved in the upward direction - see picture at right (legs incomplete) |
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